diff options
| author |   RajithaY <rajithax.yerrumsetty@intel.com> | 2017-04-25 03:31:15 -0700 |
|---|---|---|
| committer | Rajitha Yerrumchetty <rajithax.yerrumsetty@intel.com> | 2017-05-22 06:48:08 +0000 |
| commit | bb756eebdac6fd24e8919e2c43f7d2c8c4091f59 (patch) | |
| tree | ca11e03542edf2d8f631efeca5e1626d211107e3 /qemu/roms/u-boot/README | |
| parent | a14b48d18a9ed03ec191cf16b162206998a895ce (diff) | |
Adding qemu as a submodule of KVMFORNFV
This Patch includes the changes to add qemu as a submodule to
kvmfornfv repo and make use of the updated latest qemu for the
execution of all testcase
Change-Id: I1280af507a857675c7f81d30c95255635667bdd7
Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>
Diffstat (limited to 'qemu/roms/u-boot/README')
| -rw-r--r-- | qemu/roms/u-boot/README | 6191 |
1 files changed, 0 insertions, 6191 deletions
diff --git a/qemu/roms/u-boot/README b/qemu/roms/u-boot/README deleted file mode 100644 index 5f895520e..000000000 --- a/qemu/roms/u-boot/README +++ /dev/null @@ -1,6191 +0,0 @@ -# -# (C) Copyright 2000 - 2013 -# Wolfgang Denk, DENX Software Engineering, wd@denx.de. -# -# SPDX-License-Identifier: GPL-2.0+ -# - -Summary: -======== - -This directory contains the source code for U-Boot, a boot loader for -Embedded boards based on PowerPC, ARM, MIPS and several other -processors, which can be installed in a boot ROM and used to -initialize and test the hardware or to download and run application -code. - -The development of U-Boot is closely related to Linux: some parts of -the source code originate in the Linux source tree, we have some -header files in common, and special provision has been made to -support booting of Linux images. - -Some attention has been paid to make this software easily -configurable and extendable. For instance, all monitor commands are -implemented with the same call interface, so that it's very easy to -add new commands. Also, instead of permanently adding rarely used -code (for instance hardware test utilities) to the monitor, you can -load and run it dynamically. - - -Status: -======= - -In general, all boards for which a configuration option exists in the -Makefile have been tested to some extent and can be considered -"working". In fact, many of them are used in production systems. - -In case of problems see the CHANGELOG and CREDITS files to find out -who contributed the specific port. The boards.cfg file lists board -maintainers. - -Note: There is no CHANGELOG file in the actual U-Boot source tree; -it can be created dynamically from the Git log using: - - make CHANGELOG - - -Where to get help: -================== - -In case you have questions about, problems with or contributions for -U-Boot you should send a message to the U-Boot mailing list at -<u-boot@lists.denx.de>. There is also an archive of previous traffic -on the mailing list - please search the archive before asking FAQ's. -Please see http://lists.denx.de/pipermail/u-boot and -http://dir.gmane.org/gmane.comp.boot-loaders.u-boot - - -Where to get source code: -========================= - -The U-Boot source code is maintained in the git repository at -git://www.denx.de/git/u-boot.git ; you can browse it online at -http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary - -The "snapshot" links on this page allow you to download tarballs of -any version you might be interested in. Official releases are also -available for FTP download from the ftp://ftp.denx.de/pub/u-boot/ -directory. - -Pre-built (and tested) images are available from -ftp://ftp.denx.de/pub/u-boot/images/ - - -Where we come from: -=================== - -- start from 8xxrom sources -- create PPCBoot project (http://sourceforge.net/projects/ppcboot) -- clean up code -- make it easier to add custom boards -- make it possible to add other [PowerPC] CPUs -- extend functions, especially: - * Provide extended interface to Linux boot loader - * S-Record download - * network boot - * PCMCIA / CompactFlash / ATA disk / SCSI ... boot -- create ARMBoot project (http://sourceforge.net/projects/armboot) -- add other CPU families (starting with ARM) -- create U-Boot project (http://sourceforge.net/projects/u-boot) -- current project page: see http://www.denx.de/wiki/U-Boot - - -Names and Spelling: -=================== - -The "official" name of this project is "Das U-Boot". The spelling -"U-Boot" shall be used in all written text (documentation, comments -in source files etc.). Example: - - This is the README file for the U-Boot project. - -File names etc. shall be based on the string "u-boot". Examples: - - include/asm-ppc/u-boot.h - - #include <asm/u-boot.h> - -Variable names, preprocessor constants etc. shall be either based on -the string "u_boot" or on "U_BOOT". Example: - - U_BOOT_VERSION u_boot_logo - IH_OS_U_BOOT u_boot_hush_start - - -Versioning: -=========== - -Starting with the release in October 2008, the names of the releases -were changed from numerical release numbers without deeper meaning -into a time stamp based numbering. Regular releases are identified by -names consisting of the calendar year and month of the release date. -Additional fields (if present) indicate release candidates or bug fix -releases in "stable" maintenance trees. - -Examples: - U-Boot v2009.11 - Release November 2009 - U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree - U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release - - -Directory Hierarchy: -==================== - -/arch Architecture specific files - /arc Files generic to ARC architecture - /cpu CPU specific files - /arc700 Files specific to ARC 700 CPUs - /lib Architecture specific library files - /arm Files generic to ARM architecture - /cpu CPU specific files - /arm720t Files specific to ARM 720 CPUs - /arm920t Files specific to ARM 920 CPUs - /at91 Files specific to Atmel AT91RM9200 CPU - /imx Files specific to Freescale MC9328 i.MX CPUs - /s3c24x0 Files specific to Samsung S3C24X0 CPUs - /arm926ejs Files specific to ARM 926 CPUs - /arm1136 Files specific to ARM 1136 CPUs - /pxa Files specific to Intel XScale PXA CPUs - /sa1100 Files specific to Intel StrongARM SA1100 CPUs - /lib Architecture specific library files - /avr32 Files generic to AVR32 architecture - /cpu CPU specific files - /lib Architecture specific library files - /blackfin Files generic to Analog Devices Blackfin architecture - /cpu CPU specific files - /lib Architecture specific library files - /m68k Files generic to m68k architecture - /cpu CPU specific files - /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs - /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs - /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs - /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs - /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs - /lib Architecture specific library files - /microblaze Files generic to microblaze architecture - /cpu CPU specific files - /lib Architecture specific library files - /mips Files generic to MIPS architecture - /cpu CPU specific files - /mips32 Files specific to MIPS32 CPUs - /mips64 Files specific to MIPS64 CPUs - /lib Architecture specific library files - /nds32 Files generic to NDS32 architecture - /cpu CPU specific files - /n1213 Files specific to Andes Technology N1213 CPUs - /lib Architecture specific library files - /nios2 Files generic to Altera NIOS2 architecture - /cpu CPU specific files - /lib Architecture specific library files - /openrisc Files generic to OpenRISC architecture - /cpu CPU specific files - /lib Architecture specific library files - /powerpc Files generic to PowerPC architecture - /cpu CPU specific files - /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs - /mpc5xx Files specific to Freescale MPC5xx CPUs - /mpc5xxx Files specific to Freescale MPC5xxx CPUs - /mpc8xx Files specific to Freescale MPC8xx CPUs - /mpc824x Files specific to Freescale MPC824x CPUs - /mpc8260 Files specific to Freescale MPC8260 CPUs - /mpc85xx Files specific to Freescale MPC85xx CPUs - /ppc4xx Files specific to AMCC PowerPC 4xx CPUs - /lib Architecture specific library files - /sh Files generic to SH architecture - /cpu CPU specific files - /sh2 Files specific to sh2 CPUs - /sh3 Files specific to sh3 CPUs - /sh4 Files specific to sh4 CPUs - /lib Architecture specific library files - /sparc Files generic to SPARC architecture - /cpu CPU specific files - /leon2 Files specific to Gaisler LEON2 SPARC CPU - /leon3 Files specific to Gaisler LEON3 SPARC CPU - /lib Architecture specific library files - /x86 Files generic to x86 architecture - /cpu CPU specific files - /lib Architecture specific library files -/api Machine/arch independent API for external apps -/board Board dependent files -/common Misc architecture independent functions -/disk Code for disk drive partition handling -/doc Documentation (don't expect too much) -/drivers Commonly used device drivers -/dts Contains Makefile for building internal U-Boot fdt. -/examples Example code for standalone applications, etc. -/fs Filesystem code (cramfs, ext2, jffs2, etc.) -/include Header Files -/lib Files generic to all architectures - /libfdt Library files to support flattened device trees - /lzma Library files to support LZMA decompression - /lzo Library files to support LZO decompression -/net Networking code -/post Power On Self Test -/spl Secondary Program Loader framework -/tools Tools to build S-Record or U-Boot images, etc. - -Software Configuration: -======================= - -Configuration is usually done using C preprocessor defines; the -rationale behind that is to avoid dead code whenever possible. - -There are two classes of configuration variables: - -* Configuration _OPTIONS_: - These are selectable by the user and have names beginning with - "CONFIG_". - -* Configuration _SETTINGS_: - These depend on the hardware etc. and should not be meddled with if - you don't know what you're doing; they have names beginning with - "CONFIG_SYS_". - -Later we will add a configuration tool - probably similar to or even -identical to what's used for the Linux kernel. Right now, we have to -do the configuration by hand, which means creating some symbolic -links and editing some configuration files. We use the TQM8xxL boards -as an example here. - - -Selection of Processor Architecture and Board Type: ---------------------------------------------------- - -For all supported boards there are ready-to-use default -configurations available; just type "make <board_name>_config". - -Example: For a TQM823L module type: - - cd u-boot - make TQM823L_config - -For the Cogent platform, you need to specify the CPU type as well; -e.g. "make cogent_mpc8xx_config". And also configure the cogent -directory according to the instructions in cogent/README. - - -Sandbox Environment: --------------------- - -U-Boot can be built natively to run on a Linux host using the 'sandbox' -board. This allows feature development which is not board- or architecture- -specific to be undertaken on a native platform. The sandbox is also used to -run some of U-Boot's tests. - -See board/sandbox/sandbox/README.sandbox for more details. - - -Configuration Options: ----------------------- - -Configuration depends on the combination of board and CPU type; all -such information is kept in a configuration file -"include/configs/<board_name>.h". - -Example: For a TQM823L module, all configuration settings are in -"include/configs/TQM823L.h". - - -Many of the options are named exactly as the corresponding Linux -kernel configuration options. The intention is to make it easier to -build a config tool - later. - - -The following options need to be configured: - -- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX. - -- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS. - -- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined) - Define exactly one, e.g. CONFIG_ATSTK1002 - -- CPU Module Type: (if CONFIG_COGENT is defined) - Define exactly one of - CONFIG_CMA286_60_OLD ---- FIXME --- not tested yet: - CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P, - CONFIG_CMA287_23, CONFIG_CMA287_50 - -- Motherboard Type: (if CONFIG_COGENT is defined) - Define exactly one of - CONFIG_CMA101, CONFIG_CMA102 - -- Motherboard I/O Modules: (if CONFIG_COGENT is defined) - Define one or more of - CONFIG_CMA302 - -- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined) - Define one or more of - CONFIG_LCD_HEARTBEAT - update a character position on - the LCD display every second with - a "rotator" |\-/|\-/ - -- Board flavour: (if CONFIG_MPC8260ADS is defined) - CONFIG_ADSTYPE - Possible values are: - CONFIG_SYS_8260ADS - original MPC8260ADS - CONFIG_SYS_8266ADS - MPC8266ADS - CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR - CONFIG_SYS_8272ADS - MPC8272ADS - -- Marvell Family Member - CONFIG_SYS_MVFS - define it if you want to enable - multiple fs option at one time - for marvell soc family - -- MPC824X Family Member (if CONFIG_MPC824X is defined) - Define exactly one of - CONFIG_MPC8240, CONFIG_MPC8245 - -- 8xx CPU Options: (if using an MPC8xx CPU) - CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if - get_gclk_freq() cannot work - e.g. if there is no 32KHz - reference PIT/RTC clock - CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK - or XTAL/EXTAL) - -- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU): - CONFIG_SYS_8xx_CPUCLK_MIN - CONFIG_SYS_8xx_CPUCLK_MAX - CONFIG_8xx_CPUCLK_DEFAULT - See doc/README.MPC866 - - CONFIG_SYS_MEASURE_CPUCLK - - Define this to measure the actual CPU clock instead - of relying on the correctness of the configured - values. Mostly useful for board bringup to make sure - the PLL is locked at the intended frequency. Note - that this requires a (stable) reference clock (32 kHz - RTC clock or CONFIG_SYS_8XX_XIN) - - CONFIG_SYS_DELAYED_ICACHE - - Define this option if you want to enable the - ICache only when Code runs from RAM. - -- 85xx CPU Options: - CONFIG_SYS_PPC64 - - Specifies that the core is a 64-bit PowerPC implementation (implements - the "64" category of the Power ISA). This is necessary for ePAPR - compliance, among other possible reasons. - - CONFIG_SYS_FSL_TBCLK_DIV - - Defines the core time base clock divider ratio compared to the - system clock. On most PQ3 devices this is 8, on newer QorIQ - devices it can be 16 or 32. The ratio varies from SoC to Soc. - - CONFIG_SYS_FSL_PCIE_COMPAT - - Defines the string to utilize when trying to match PCIe device - tree nodes for the given platform. - - CONFIG_SYS_PPC_E500_DEBUG_TLB - - Enables a temporary TLB entry to be used during boot to work - around limitations in e500v1 and e500v2 external debugger - support. This reduces the portions of the boot code where - breakpoints and single stepping do not work. The value of this - symbol should be set to the TLB1 entry to be used for this - purpose. - - CONFIG_SYS_FSL_ERRATUM_A004510 - - Enables a workaround for erratum A004510. If set, - then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and - CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set. - - CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV - CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional) - - Defines one or two SoC revisions (low 8 bits of SVR) - for which the A004510 workaround should be applied. - - The rest of SVR is either not relevant to the decision - of whether the erratum is present (e.g. p2040 versus - p2041) or is implied by the build target, which controls - whether CONFIG_SYS_FSL_ERRATUM_A004510 is set. - - See Freescale App Note 4493 for more information about - this erratum. - - CONFIG_A003399_NOR_WORKAROUND - Enables a workaround for IFC erratum A003399. It is only - requred during NOR boot. - - CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY - - This is the value to write into CCSR offset 0x18600 - according to the A004510 workaround. - - CONFIG_SYS_FSL_DSP_DDR_ADDR - This value denotes start offset of DDR memory which is - connected exclusively to the DSP cores. - - CONFIG_SYS_FSL_DSP_M2_RAM_ADDR - This value denotes start offset of M2 memory - which is directly connected to the DSP core. - - CONFIG_SYS_FSL_DSP_M3_RAM_ADDR - This value denotes start offset of M3 memory which is directly - connected to the DSP core. - - CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT - This value denotes start offset of DSP CCSR space. - - CONFIG_SYS_FSL_SINGLE_SOURCE_CLK - Single Source Clock is clocking mode present in some of FSL SoC's. - In this mode, a single differential clock is used to supply - clocks to the sysclock, ddrclock and usbclock. - - CONFIG_SYS_CPC_REINIT_F - This CONFIG is defined when the CPC is configured as SRAM at the - time of U-boot entry and is required to be re-initialized. - - CONFIG_DEEP_SLEEP - Inidcates this SoC supports deep sleep feature. If deep sleep is - supported, core will start to execute uboot when wakes up. - -- Generic CPU options: - CONFIG_SYS_GENERIC_GLOBAL_DATA - Defines global data is initialized in generic board board_init_f(). - If this macro is defined, global data is created and cleared in - generic board board_init_f(). Without this macro, architecture/board - should initialize global data before calling board_init_f(). - - CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN - - Defines the endianess of the CPU. Implementation of those - values is arch specific. - - CONFIG_SYS_FSL_DDR - Freescale DDR driver in use. This type of DDR controller is - found in mpc83xx, mpc85xx, mpc86xx as well as some ARM core - SoCs. - - CONFIG_SYS_FSL_DDR_ADDR - Freescale DDR memory-mapped register base. - - CONFIG_SYS_FSL_DDR_EMU - Specify emulator support for DDR. Some DDR features such as - deskew training are not available. - - CONFIG_SYS_FSL_DDRC_GEN1 - Freescale DDR1 controller. - - CONFIG_SYS_FSL_DDRC_GEN2 - Freescale DDR2 controller. - - CONFIG_SYS_FSL_DDRC_GEN3 - Freescale DDR3 controller. - - CONFIG_SYS_FSL_DDRC_GEN4 - Freescale DDR4 controller. - - CONFIG_SYS_FSL_DDRC_ARM_GEN3 - Freescale DDR3 controller for ARM-based SoCs. - - CONFIG_SYS_FSL_DDR1 - Board config to use DDR1. It can be enabled for SoCs with - Freescale DDR1 or DDR2 controllers, depending on the board - implemetation. - - CONFIG_SYS_FSL_DDR2 - Board config to use DDR2. It can be eanbeld for SoCs with - Freescale DDR2 or DDR3 controllers, depending on the board - implementation. - - CONFIG_SYS_FSL_DDR3 - Board config to use DDR3. It can be enabled for SoCs with - Freescale DDR3 or DDR3L controllers. - - CONFIG_SYS_FSL_DDR3L - Board config to use DDR3L. It can be enabled for SoCs with - DDR3L controllers. - - CONFIG_SYS_FSL_DDR4 - Board config to use DDR4. It can be enabled for SoCs with - DDR4 controllers. - - CONFIG_SYS_FSL_IFC_BE - Defines the IFC controller register space as Big Endian - - CONFIG_SYS_FSL_IFC_LE - Defines the IFC controller register space as Little Endian - - CONFIG_SYS_FSL_PBL_PBI - It enables addition of RCW (Power on reset configuration) in built image. - Please refer doc/README.pblimage for more details - - CONFIG_SYS_FSL_PBL_RCW - It adds PBI(pre-boot instructions) commands in u-boot build image. - PBI commands can be used to configure SoC before it starts the execution. - Please refer doc/README.pblimage for more details - - CONFIG_SPL_FSL_PBL - It adds a target to create boot binary having SPL binary in PBI format - concatenated with u-boot binary. - - CONFIG_SYS_FSL_DDR_BE - Defines the DDR controller register space as Big Endian - - CONFIG_SYS_FSL_DDR_LE - Defines the DDR controller register space as Little Endian - - CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY - Physical address from the view of DDR controllers. It is the - same as CONFIG_SYS_DDR_SDRAM_BASE for all Power SoCs. But - it could be different for ARM SoCs. - - CONFIG_SYS_FSL_DDR_INTLV_256B - DDR controller interleaving on 256-byte. This is a special - interleaving mode, handled by Dickens for Freescale layerscape - SoCs with ARM core. - -- Intel Monahans options: - CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO - - Defines the Monahans run mode to oscillator - ratio. Valid values are 8, 16, 24, 31. The core - frequency is this value multiplied by 13 MHz. - - CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO - - Defines the Monahans turbo mode to oscillator - ratio. Valid values are 1 (default if undefined) and - 2. The core frequency as calculated above is multiplied - by this value. - -- MIPS CPU options: - CONFIG_SYS_INIT_SP_OFFSET - - Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack - pointer. This is needed for the temporary stack before - relocation. - - CONFIG_SYS_MIPS_CACHE_MODE - - Cache operation mode for the MIPS CPU. - See also arch/mips/include/asm/mipsregs.h. - Possible values are: - CONF_CM_CACHABLE_NO_WA - CONF_CM_CACHABLE_WA - CONF_CM_UNCACHED - CONF_CM_CACHABLE_NONCOHERENT - CONF_CM_CACHABLE_CE - CONF_CM_CACHABLE_COW - CONF_CM_CACHABLE_CUW - CONF_CM_CACHABLE_ACCELERATED - - CONFIG_SYS_XWAY_EBU_BOOTCFG - - Special option for Lantiq XWAY SoCs for booting from NOR flash. - See also arch/mips/cpu/mips32/start.S. - - CONFIG_XWAY_SWAP_BYTES - - Enable compilation of tools/xway-swap-bytes needed for Lantiq - XWAY SoCs for booting from NOR flash. The U-Boot image needs to - be swapped if a flash programmer is used. - -- ARM options: - CONFIG_SYS_EXCEPTION_VECTORS_HIGH - - Select high exception vectors of the ARM core, e.g., do not - clear the V bit of the c1 register of CP15. - - CONFIG_SYS_THUMB_BUILD - - Use this flag to build U-Boot using the Thumb instruction - set for ARM architectures. Thumb instruction set provides - better code density. For ARM architectures that support - Thumb2 this flag will result in Thumb2 code generated by - GCC. - - CONFIG_ARM_ERRATA_716044 - CONFIG_ARM_ERRATA_742230 - CONFIG_ARM_ERRATA_743622 - CONFIG_ARM_ERRATA_751472 - CONFIG_ARM_ERRATA_794072 - CONFIG_ARM_ERRATA_761320 - - If set, the workarounds for these ARM errata are applied early - during U-Boot startup. Note that these options force the - workarounds to be applied; no CPU-type/version detection - exists, unlike the similar options in the Linux kernel. Do not - set these options unless they apply! - -- CPU timer options: - CONFIG_SYS_HZ - - The frequency of the timer returned by get_timer(). - get_timer() must operate in milliseconds and this CONFIG - option must be set to 1000. - -- Linux Kernel Interface: - CONFIG_CLOCKS_IN_MHZ - - U-Boot stores all clock information in Hz - internally. For binary compatibility with older Linux - kernels (which expect the clocks passed in the - bd_info data to be in MHz) the environment variable - "clocks_in_mhz" can be defined so that U-Boot - converts clock data to MHZ before passing it to the - Linux kernel. - When CONFIG_CLOCKS_IN_MHZ is defined, a definition of - "clocks_in_mhz=1" is automatically included in the - default environment. - - CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only] - - When transferring memsize parameter to linux, some versions - expect it to be in bytes, others in MB. - Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes. - - CONFIG_OF_LIBFDT - - New kernel versions are expecting firmware settings to be - passed using flattened device trees (based on open firmware - concepts). - - CONFIG_OF_LIBFDT - * New libfdt-based support - * Adds the "fdt" command - * The bootm command automatically updates the fdt - - OF_CPU - The proper name of the cpus node (only required for - MPC512X and MPC5xxx based boards). - OF_SOC - The proper name of the soc node (only required for - MPC512X and MPC5xxx based boards). - OF_TBCLK - The timebase frequency. - OF_STDOUT_PATH - The path to the console device - - boards with QUICC Engines require OF_QE to set UCC MAC - addresses - - CONFIG_OF_BOARD_SETUP - - Board code has addition modification that it wants to make - to the flat device tree before handing it off to the kernel - - CONFIG_OF_BOOT_CPU - - This define fills in the correct boot CPU in the boot - param header, the default value is zero if undefined. - - CONFIG_OF_IDE_FIXUP - - U-Boot can detect if an IDE device is present or not. - If not, and this new config option is activated, U-Boot - removes the ATA node from the DTS before booting Linux, - so the Linux IDE driver does not probe the device and - crash. This is needed for buggy hardware (uc101) where - no pull down resistor is connected to the signal IDE5V_DD7. - - CONFIG_MACH_TYPE [relevant for ARM only][mandatory] - - This setting is mandatory for all boards that have only one - machine type and must be used to specify the machine type - number as it appears in the ARM machine registry - (see http://www.arm.linux.org.uk/developer/machines/). - Only boards that have multiple machine types supported - in a single configuration file and the machine type is - runtime discoverable, do not have to use this setting. - -- vxWorks boot parameters: - - bootvx constructs a valid bootline using the following - environments variables: bootfile, ipaddr, serverip, hostname. - It loads the vxWorks image pointed bootfile. - - CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name - CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address - CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server - CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters - - CONFIG_SYS_VXWORKS_ADD_PARAMS - - Add it at the end of the bootline. E.g "u=username pw=secret" - - Note: If a "bootargs" environment is defined, it will overwride - the defaults discussed just above. - -- Cache Configuration: - CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot - CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot - CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot - -- Cache Configuration for ARM: - CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache - controller - CONFIG_SYS_PL310_BASE - Physical base address of PL310 - controller register space - -- Serial Ports: - CONFIG_PL010_SERIAL - - Define this if you want support for Amba PrimeCell PL010 UARTs. - - CONFIG_PL011_SERIAL - - Define this if you want support for Amba PrimeCell PL011 UARTs. - - CONFIG_PL011_CLOCK - - If you have Amba PrimeCell PL011 UARTs, set this variable to - the clock speed of the UARTs. - - CONFIG_PL01x_PORTS - - If you have Amba PrimeCell PL010 or PL011 UARTs on your board, - define this to a list of base addresses for each (supported) - port. See e.g. include/configs/versatile.h - - CONFIG_PL011_SERIAL_RLCR - - Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500) - have separate receive and transmit line control registers. Set - this variable to initialize the extra register. - - CONFIG_PL011_SERIAL_FLUSH_ON_INIT - - On some platforms (e.g. U8500) U-Boot is loaded by a second stage - boot loader that has already initialized the UART. Define this - variable to flush the UART at init time. - - CONFIG_SERIAL_HW_FLOW_CONTROL - - Define this variable to enable hw flow control in serial driver. - Current user of this option is drivers/serial/nsl16550.c driver - -- Console Interface: - Depending on board, define exactly one serial port - (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2, - CONFIG_8xx_CONS_SCC1, ...), or switch off the serial - console by defining CONFIG_8xx_CONS_NONE - - Note: if CONFIG_8xx_CONS_NONE is defined, the serial - port routines must be defined elsewhere - (i.e. serial_init(), serial_getc(), ...) - - CONFIG_CFB_CONSOLE - Enables console device for a color framebuffer. Needs following - defines (cf. smiLynxEM, i8042) - VIDEO_FB_LITTLE_ENDIAN graphic memory organisation - (default big endian) - VIDEO_HW_RECTFILL graphic chip supports - rectangle fill - (cf. smiLynxEM) - VIDEO_HW_BITBLT graphic chip supports - bit-blit (cf. smiLynxEM) - VIDEO_VISIBLE_COLS visible pixel columns - (cols=pitch) - VIDEO_VISIBLE_ROWS visible pixel rows - VIDEO_PIXEL_SIZE bytes per pixel - VIDEO_DATA_FORMAT graphic data format - (0-5, cf. cfb_console.c) - VIDEO_FB_ADRS framebuffer address - VIDEO_KBD_INIT_FCT keyboard int fct - (i.e. i8042_kbd_init()) - VIDEO_TSTC_FCT test char fct - (i.e. i8042_tstc) - VIDEO_GETC_FCT get char fct - (i.e. i8042_getc) - CONFIG_CONSOLE_CURSOR cursor drawing on/off - (requires blink timer - cf. i8042.c) - CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c) - CONFIG_CONSOLE_TIME display time/date info in - upper right corner - (requires CONFIG_CMD_DATE) - CONFIG_VIDEO_LOGO display Linux logo in - upper left corner - CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of - linux_logo.h for logo. - Requires CONFIG_VIDEO_LOGO - CONFIG_CONSOLE_EXTRA_INFO - additional board info beside - the logo - - When CONFIG_CFB_CONSOLE_ANSI is defined, console will support - a limited number of ANSI escape sequences (cursor control, - erase functions and limited graphics rendition control). - - When CONFIG_CFB_CONSOLE is defined, video console is - default i/o. Serial console can be forced with - environment 'console=serial'. - - When CONFIG_SILENT_CONSOLE is defined, all console - messages (by U-Boot and Linux!) can be silenced with - the "silent" environment variable. See - doc/README.silent for more information. - - CONFIG_SYS_CONSOLE_BG_COL: define the backgroundcolor, default - is 0x00. - CONFIG_SYS_CONSOLE_FG_COL: define the foregroundcolor, default - is 0xa0. - -- Console Baudrate: - CONFIG_BAUDRATE - in bps - Select one of the baudrates listed in - CONFIG_SYS_BAUDRATE_TABLE, see below. - CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale - -- Console Rx buffer length - With CONFIG_SYS_SMC_RXBUFLEN it is possible to define - the maximum receive buffer length for the SMC. - This option is actual only for 82xx and 8xx possible. - If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE - must be defined, to setup the maximum idle timeout for - the SMC. - -- Pre-Console Buffer: - Prior to the console being initialised (i.e. serial UART - initialised etc) all console output is silently discarded. - Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to - buffer any console messages prior to the console being - initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ - bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is - a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ - bytes are output before the console is initialised, the - earlier bytes are discarded. - - 'Sane' compilers will generate smaller code if - CONFIG_PRE_CON_BUF_SZ is a power of 2 - -- Safe printf() functions - Define CONFIG_SYS_VSNPRINTF to compile in safe versions of - the printf() functions. These are defined in - include/vsprintf.h and include snprintf(), vsnprintf() and - so on. Code size increase is approximately 300-500 bytes. - If this option is not given then these functions will - silently discard their buffer size argument - this means - you are not getting any overflow checking in this case. - -- Boot Delay: CONFIG_BOOTDELAY - in seconds - Delay before automatically booting the default image; - set to -1 to disable autoboot. - set to -2 to autoboot with no delay and not check for abort - (even when CONFIG_ZERO_BOOTDELAY_CHECK is defined). - - See doc/README.autoboot for these options that - work with CONFIG_BOOTDELAY. None are required. - CONFIG_BOOT_RETRY_TIME - CONFIG_BOOT_RETRY_MIN - CONFIG_AUTOBOOT_KEYED - CONFIG_AUTOBOOT_PROMPT - CONFIG_AUTOBOOT_DELAY_STR - CONFIG_AUTOBOOT_STOP_STR - CONFIG_AUTOBOOT_DELAY_STR2 - CONFIG_AUTOBOOT_STOP_STR2 - CONFIG_ZERO_BOOTDELAY_CHECK - CONFIG_RESET_TO_RETRY - -- Autoboot Command: - CONFIG_BOOTCOMMAND - Only needed when CONFIG_BOOTDELAY is enabled; - define a command string that is automatically executed - when no character is read on the console interface - within "Boot Delay" after reset. - - CONFIG_BOOTARGS - This can be used to pass arguments to the bootm - command. The value of CONFIG_BOOTARGS goes into the - environment value "bootargs". - - CONFIG_RAMBOOT and CONFIG_NFSBOOT - The value of these goes into the environment as - "ramboot" and "nfsboot" respectively, and can be used - as a convenience, when switching between booting from - RAM and NFS. - -- Bootcount: - CONFIG_BOOTCOUNT_LIMIT - Implements a mechanism for detecting a repeating reboot - cycle, see: - http://www.denx.de/wiki/view/DULG/UBootBootCountLimit - - CONFIG_BOOTCOUNT_ENV - If no softreset save registers are found on the hardware - "bootcount" is stored in the environment. To prevent a - saveenv on all reboots, the environment variable - "upgrade_available" is used. If "upgrade_available" is - 0, "bootcount" is always 0, if "upgrade_available" is - 1 "bootcount" is incremented in the environment. - So the Userspace Applikation must set the "upgrade_available" - and "bootcount" variable to 0, if a boot was successfully. - -- Pre-Boot Commands: - CONFIG_PREBOOT - - When this option is #defined, the existence of the - environment variable "preboot" will be checked - immediately before starting the CONFIG_BOOTDELAY - countdown and/or running the auto-boot command resp. - entering interactive mode. - - This feature is especially useful when "preboot" is - automatically generated or modified. For an example - see the LWMON board specific code: here "preboot" is - modified when the user holds down a certain - combination of keys on the (special) keyboard when - booting the systems - -- Serial Download Echo Mode: - CONFIG_LOADS_ECHO - If defined to 1, all characters received during a - serial download (using the "loads" command) are - echoed back. This might be needed by some terminal - emulations (like "cu"), but may as well just take - time on others. This setting #define's the initial - value of the "loads_echo" environment variable. - -- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined) - CONFIG_KGDB_BAUDRATE - Select one of the baudrates listed in - CONFIG_SYS_BAUDRATE_TABLE, see below. - -- Monitor Functions: - Monitor commands can be included or excluded - from the build by using the #include files - <config_cmd_all.h> and #undef'ing unwanted - commands, or using <config_cmd_default.h> - and augmenting with additional #define's - for wanted commands. - - The default command configuration includes all commands - except those marked below with a "*". - - CONFIG_CMD_AES AES 128 CBC encrypt/decrypt - CONFIG_CMD_ASKENV * ask for env variable - CONFIG_CMD_BDI bdinfo - CONFIG_CMD_BEDBUG * Include BedBug Debugger - CONFIG_CMD_BMP * BMP support - CONFIG_CMD_BSP * Board specific commands - CONFIG_CMD_BOOTD bootd - CONFIG_CMD_CACHE * icache, dcache - CONFIG_CMD_CLK * clock command support - CONFIG_CMD_CONSOLE coninfo - CONFIG_CMD_CRC32 * crc32 - CONFIG_CMD_DATE * support for RTC, date/time... - CONFIG_CMD_DHCP * DHCP support - CONFIG_CMD_DIAG * Diagnostics - CONFIG_CMD_DS4510 * ds4510 I2C gpio commands - CONFIG_CMD_DS4510_INFO * ds4510 I2C info command - CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd - CONFIG_CMD_DS4510_RST * ds4510 I2C rst command - CONFIG_CMD_DTT * Digital Therm and Thermostat - CONFIG_CMD_ECHO echo arguments - CONFIG_CMD_EDITENV edit env variable - CONFIG_CMD_EEPROM * EEPROM read/write support - CONFIG_CMD_ELF * bootelf, bootvx - CONFIG_CMD_ENV_CALLBACK * display details about env callbacks - CONFIG_CMD_ENV_FLAGS * display details about env flags - CONFIG_CMD_ENV_EXISTS * check existence of env variable - CONFIG_CMD_EXPORTENV * export the environment - CONFIG_CMD_EXT2 * ext2 command support - CONFIG_CMD_EXT4 * ext4 command support - CONFIG_CMD_FS_GENERIC * filesystem commands (e.g. load, ls) - that work for multiple fs types - CONFIG_CMD_SAVEENV saveenv - CONFIG_CMD_FDC * Floppy Disk Support - CONFIG_CMD_FAT * FAT command support - CONFIG_CMD_FLASH flinfo, erase, protect - CONFIG_CMD_FPGA FPGA device initialization support - CONFIG_CMD_FUSE * Device fuse support - CONFIG_CMD_GETTIME * Get time since boot - CONFIG_CMD_GO * the 'go' command (exec code) - CONFIG_CMD_GREPENV * search environment - CONFIG_CMD_HASH * calculate hash / digest - CONFIG_CMD_HWFLOW * RTS/CTS hw flow control - CONFIG_CMD_I2C * I2C serial bus support - CONFIG_CMD_IDE * IDE harddisk support - CONFIG_CMD_IMI iminfo - CONFIG_CMD_IMLS List all images found in NOR flash - CONFIG_CMD_IMLS_NAND * List all images found in NAND flash - CONFIG_CMD_IMMAP * IMMR dump support - CONFIG_CMD_IMPORTENV * import an environment - CONFIG_CMD_INI * import data from an ini file into the env - CONFIG_CMD_IRQ * irqinfo - CONFIG_CMD_ITEST Integer/string test of 2 values - CONFIG_CMD_JFFS2 * JFFS2 Support - CONFIG_CMD_KGDB * kgdb - CONFIG_CMD_LDRINFO * ldrinfo (display Blackfin loader) - CONFIG_CMD_LINK_LOCAL * link-local IP address auto-configuration - (169.254.*.*) - CONFIG_CMD_LOADB loadb - CONFIG_CMD_LOADS loads - CONFIG_CMD_MD5SUM * print md5 message digest - (requires CONFIG_CMD_MEMORY and CONFIG_MD5) - CONFIG_CMD_MEMINFO * Display detailed memory information - CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base, - loop, loopw - CONFIG_CMD_MEMTEST * mtest - CONFIG_CMD_MISC Misc functions like sleep etc - CONFIG_CMD_MMC * MMC memory mapped support - CONFIG_CMD_MII * MII utility commands - CONFIG_CMD_MTDPARTS * MTD partition support - CONFIG_CMD_NAND * NAND support - CONFIG_CMD_NET bootp, tftpboot, rarpboot - CONFIG_CMD_NFS NFS support - CONFIG_CMD_PCA953X * PCA953x I2C gpio commands - CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command - CONFIG_CMD_PCI * pciinfo - CONFIG_CMD_PCMCIA * PCMCIA support - CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network - host - CONFIG_CMD_PORTIO * Port I/O - CONFIG_CMD_READ * Read raw data from partition - CONFIG_CMD_REGINFO * Register dump - CONFIG_CMD_RUN run command in env variable - CONFIG_CMD_SANDBOX * sb command to access sandbox features - CONFIG_CMD_SAVES * save S record dump - CONFIG_CMD_SCSI * SCSI Support - CONFIG_CMD_SDRAM * print SDRAM configuration information - (requires CONFIG_CMD_I2C) - CONFIG_CMD_SETGETDCR Support for DCR Register access - (4xx only) - CONFIG_CMD_SF * Read/write/erase SPI NOR flash - CONFIG_CMD_SHA1SUM * print sha1 memory digest - (requires CONFIG_CMD_MEMORY) - CONFIG_CMD_SOFTSWITCH * Soft switch setting command for BF60x - CONFIG_CMD_SOURCE "source" command Support - CONFIG_CMD_SPI * SPI serial bus support - CONFIG_CMD_TFTPSRV * TFTP transfer in server mode - CONFIG_CMD_TFTPPUT * TFTP put command (upload) - CONFIG_CMD_TIME * run command and report execution time (ARM specific) - CONFIG_CMD_TIMER * access to the system tick timer - CONFIG_CMD_USB * USB support - CONFIG_CMD_CDP * Cisco Discover Protocol support - CONFIG_CMD_MFSL * Microblaze FSL support - CONFIG_CMD_XIMG Load part of Multi Image - CONFIG_CMD_UUID * Generate random UUID or GUID string - - EXAMPLE: If you want all functions except of network - support you can write: - - #include "config_cmd_all.h" - #undef CONFIG_CMD_NET - - Other Commands: - fdt (flattened device tree) command: CONFIG_OF_LIBFDT - - Note: Don't enable the "icache" and "dcache" commands - (configuration option CONFIG_CMD_CACHE) unless you know - what you (and your U-Boot users) are doing. Data - cache cannot be enabled on systems like the 8xx or - 8260 (where accesses to the IMMR region must be - uncached), and it cannot be disabled on all other - systems where we (mis-) use the data cache to hold an - initial stack and some data. - - - XXX - this list needs to get updated! - -- Regular expression support: - CONFIG_REGEX - If this variable is defined, U-Boot is linked against - the SLRE (Super Light Regular Expression) library, - which adds regex support to some commands, as for - example "env grep" and "setexpr". - -- Device tree: - CONFIG_OF_CONTROL - If this variable is defined, U-Boot will use a device tree - to configure its devices, instead of relying on statically - compiled #defines in the board file. This option is - experimental and only available on a few boards. The device - tree is available in the global data as gd->fdt_blob. - - U-Boot needs to get its device tree from somewhere. This can - be done using one of the two options below: - - CONFIG_OF_EMBED - If this variable is defined, U-Boot will embed a device tree - binary in its image. This device tree file should be in the - board directory and called <soc>-<board>.dts. The binary file - is then picked up in board_init_f() and made available through - the global data structure as gd->blob. - - CONFIG_OF_SEPARATE - If this variable is defined, U-Boot will build a device tree - binary. It will be called u-boot.dtb. Architecture-specific - code will locate it at run-time. Generally this works by: - - cat u-boot.bin u-boot.dtb >image.bin - - and in fact, U-Boot does this for you, creating a file called - u-boot-dtb.bin which is useful in the common case. You can - still use the individual files if you need something more - exotic. - -- Watchdog: - CONFIG_WATCHDOG - If this variable is defined, it enables watchdog - support for the SoC. There must be support in the SoC - specific code for a watchdog. For the 8xx and 8260 - CPUs, the SIU Watchdog feature is enabled in the SYPCR - register. When supported for a specific SoC is - available, then no further board specific code should - be needed to use it. - - CONFIG_HW_WATCHDOG - When using a watchdog circuitry external to the used - SoC, then define this variable and provide board - specific code for the "hw_watchdog_reset" function. - -- U-Boot Version: - CONFIG_VERSION_VARIABLE - If this variable is defined, an environment variable - named "ver" is created by U-Boot showing the U-Boot - version as printed by the "version" command. - Any change to this variable will be reverted at the - next reset. - -- Real-Time Clock: - - When CONFIG_CMD_DATE is selected, the type of the RTC - has to be selected, too. Define exactly one of the - following options: - - CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx - CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC - CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC - CONFIG_RTC_MC146818 - use MC146818 RTC - CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC - CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC - CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC - CONFIG_RTC_DS164x - use Dallas DS164x RTC - CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC - CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC - CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337 - CONFIG_SYS_RV3029_TCR - enable trickle charger on - RV3029 RTC. - - Note that if the RTC uses I2C, then the I2C interface - must also be configured. See I2C Support, below. - -- GPIO Support: - CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO - - The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of - chip-ngpio pairs that tell the PCA953X driver the number of - pins supported by a particular chip. - - Note that if the GPIO device uses I2C, then the I2C interface - must also be configured. See I2C Support, below. - -- Timestamp Support: - - When CONFIG_TIMESTAMP is selected, the timestamp - (date and time) of an image is printed by image - commands like bootm or iminfo. This option is - automatically enabled when you select CONFIG_CMD_DATE . - -- Partition Labels (disklabels) Supported: - Zero or more of the following: - CONFIG_MAC_PARTITION Apple's MacOS partition table. - CONFIG_DOS_PARTITION MS Dos partition table, traditional on the - Intel architecture, USB sticks, etc. - CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc. - CONFIG_EFI_PARTITION GPT partition table, common when EFI is the - bootloader. Note 2TB partition limit; see - disk/part_efi.c - CONFIG_MTD_PARTITIONS Memory Technology Device partition table. - - If IDE or SCSI support is enabled (CONFIG_CMD_IDE or - CONFIG_CMD_SCSI) you must configure support for at - least one non-MTD partition type as well. - -- IDE Reset method: - CONFIG_IDE_RESET_ROUTINE - this is defined in several - board configurations files but used nowhere! - - CONFIG_IDE_RESET - is this is defined, IDE Reset will - be performed by calling the function - ide_set_reset(int reset) - which has to be defined in a board specific file - -- ATAPI Support: - CONFIG_ATAPI - - Set this to enable ATAPI support. - -- LBA48 Support - CONFIG_LBA48 - - Set this to enable support for disks larger than 137GB - Also look at CONFIG_SYS_64BIT_LBA. - Whithout these , LBA48 support uses 32bit variables and will 'only' - support disks up to 2.1TB. - - CONFIG_SYS_64BIT_LBA: - When enabled, makes the IDE subsystem use 64bit sector addresses. - Default is 32bit. - -- SCSI Support: - At the moment only there is only support for the - SYM53C8XX SCSI controller; define - CONFIG_SCSI_SYM53C8XX to enable it. - - CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and - CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID * - CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the - maximum numbers of LUNs, SCSI ID's and target - devices. - CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz) - - The environment variable 'scsidevs' is set to the number of - SCSI devices found during the last scan. - -- NETWORK Support (PCI): - CONFIG_E1000 - Support for Intel 8254x/8257x gigabit chips. - - CONFIG_E1000_SPI - Utility code for direct access to the SPI bus on Intel 8257x. - This does not do anything useful unless you set at least one - of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC. - - CONFIG_E1000_SPI_GENERIC - Allow generic access to the SPI bus on the Intel 8257x, for - example with the "sspi" command. - - CONFIG_CMD_E1000 - Management command for E1000 devices. When used on devices - with SPI support you can reprogram the EEPROM from U-Boot. - - CONFIG_E1000_FALLBACK_MAC - default MAC for empty EEPROM after production. - - CONFIG_EEPRO100 - Support for Intel 82557/82559/82559ER chips. - Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM - write routine for first time initialisation. - - CONFIG_TULIP - Support for Digital 2114x chips. - Optional CONFIG_TULIP_SELECT_MEDIA for board specific - modem chip initialisation (KS8761/QS6611). - - CONFIG_NATSEMI - Support for National dp83815 chips. - - CONFIG_NS8382X - Support for National dp8382[01] gigabit chips. - -- NETWORK Support (other): - - CONFIG_DRIVER_AT91EMAC - Support for AT91RM9200 EMAC. - - CONFIG_RMII - Define this to use reduced MII inteface - - CONFIG_DRIVER_AT91EMAC_QUIET - If this defined, the driver is quiet. - The driver doen't show link status messages. - - CONFIG_CALXEDA_XGMAC - Support for the Calxeda XGMAC device - - CONFIG_LAN91C96 - Support for SMSC's LAN91C96 chips. - - CONFIG_LAN91C96_BASE - Define this to hold the physical address - of the LAN91C96's I/O space - - CONFIG_LAN91C96_USE_32_BIT - Define this to enable 32 bit addressing - - CONFIG_SMC91111 - Support for SMSC's LAN91C111 chip - - CONFIG_SMC91111_BASE - Define this to hold the physical address - of the device (I/O space) - - CONFIG_SMC_USE_32_BIT - Define this if data bus is 32 bits - - CONFIG_SMC_USE_IOFUNCS - Define this to use i/o functions instead of macros - (some hardware wont work with macros) - - CONFIG_DRIVER_TI_EMAC - Support for davinci emac - - CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT - Define this if you have more then 3 PHYs. - - CONFIG_FTGMAC100 - Support for Faraday's FTGMAC100 Gigabit SoC Ethernet - - CONFIG_FTGMAC100_EGIGA - Define this to use GE link update with gigabit PHY. - Define this if FTGMAC100 is connected to gigabit PHY. - If your system has 10/100 PHY only, it might not occur - wrong behavior. Because PHY usually return timeout or - useless data when polling gigabit status and gigabit - control registers. This behavior won't affect the - correctnessof 10/100 link speed update. - - CONFIG_SMC911X - Support for SMSC's LAN911x and LAN921x chips - - CONFIG_SMC911X_BASE - Define this to hold the physical address - of the device (I/O space) - - CONFIG_SMC911X_32_BIT - Define this if data bus is 32 bits - - CONFIG_SMC911X_16_BIT - Define this if data bus is 16 bits. If your processor - automatically converts one 32 bit word to two 16 bit - words you may also try CONFIG_SMC911X_32_BIT. - - CONFIG_SH_ETHER - Support for Renesas on-chip Ethernet controller - - CONFIG_SH_ETHER_USE_PORT - Define the number of ports to be used - - CONFIG_SH_ETHER_PHY_ADDR - Define the ETH PHY's address - - CONFIG_SH_ETHER_CACHE_WRITEBACK - If this option is set, the driver enables cache flush. - -- TPM Support: - CONFIG_TPM - Support TPM devices. - - CONFIG_TPM_TIS_I2C - Support for i2c bus TPM devices. Only one device - per system is supported at this time. - - CONFIG_TPM_TIS_I2C_BUS_NUMBER - Define the the i2c bus number for the TPM device - - CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS - Define the TPM's address on the i2c bus - - CONFIG_TPM_TIS_I2C_BURST_LIMITATION - Define the burst count bytes upper limit - - CONFIG_TPM_ATMEL_TWI - Support for Atmel TWI TPM device. Requires I2C support. - - CONFIG_TPM_TIS_LPC - Support for generic parallel port TPM devices. Only one device - per system is supported at this time. - - CONFIG_TPM_TIS_BASE_ADDRESS - Base address where the generic TPM device is mapped - to. Contemporary x86 systems usually map it at - 0xfed40000. - - CONFIG_CMD_TPM - Add tpm monitor functions. - Requires CONFIG_TPM. If CONFIG_TPM_AUTH_SESSIONS is set, also - provides monitor access to authorized functions. - - CONFIG_TPM - Define this to enable the TPM support library which provides - functional interfaces to some TPM commands. - Requires support for a TPM device. - - CONFIG_TPM_AUTH_SESSIONS - Define this to enable authorized functions in the TPM library. - Requires CONFIG_TPM and CONFIG_SHA1. - -- USB Support: - At the moment only the UHCI host controller is - supported (PIP405, MIP405, MPC5200); define - CONFIG_USB_UHCI to enable it. - define CONFIG_USB_KEYBOARD to enable the USB Keyboard - and define CONFIG_USB_STORAGE to enable the USB - storage devices. - Note: - Supported are USB Keyboards and USB Floppy drives - (TEAC FD-05PUB). - MPC5200 USB requires additional defines: - CONFIG_USB_CLOCK - for 528 MHz Clock: 0x0001bbbb - CONFIG_PSC3_USB - for USB on PSC3 - CONFIG_USB_CONFIG - for differential drivers: 0x00001000 - for single ended drivers: 0x00005000 - for differential drivers on PSC3: 0x00000100 - for single ended drivers on PSC3: 0x00004100 - CONFIG_SYS_USB_EVENT_POLL - May be defined to allow interrupt polling - instead of using asynchronous interrupts - - CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the - txfilltuning field in the EHCI controller on reset. - - CONFIG_USB_HUB_MIN_POWER_ON_DELAY defines the minimum - interval for usb hub power-on delay.(minimum 100msec) - -- USB Device: - Define the below if you wish to use the USB console. - Once firmware is rebuilt from a serial console issue the - command "setenv stdin usbtty; setenv stdout usbtty" and - attach your USB cable. The Unix command "dmesg" should print - it has found a new device. The environment variable usbtty - can be set to gserial or cdc_acm to enable your device to - appear to a USB host as a Linux gserial device or a - Common Device Class Abstract Control Model serial device. - If you select usbtty = gserial you should be able to enumerate - a Linux host by - # modprobe usbserial vendor=0xVendorID product=0xProductID - else if using cdc_acm, simply setting the environment - variable usbtty to be cdc_acm should suffice. The following - might be defined in YourBoardName.h - - CONFIG_USB_DEVICE - Define this to build a UDC device - - CONFIG_USB_TTY - Define this to have a tty type of device available to - talk to the UDC device - - CONFIG_USBD_HS - Define this to enable the high speed support for usb - device and usbtty. If this feature is enabled, a routine - int is_usbd_high_speed(void) - also needs to be defined by the driver to dynamically poll - whether the enumeration has succeded at high speed or full - speed. - - CONFIG_SYS_CONSOLE_IS_IN_ENV - Define this if you want stdin, stdout &/or stderr to - be set to usbtty. - - mpc8xx: - CONFIG_SYS_USB_EXTC_CLK 0xBLAH - Derive USB clock from external clock "blah" - - CONFIG_SYS_USB_EXTC_CLK 0x02 - - CONFIG_SYS_USB_BRG_CLK 0xBLAH - Derive USB clock from brgclk - - CONFIG_SYS_USB_BRG_CLK 0x04 - - If you have a USB-IF assigned VendorID then you may wish to - define your own vendor specific values either in BoardName.h - or directly in usbd_vendor_info.h. If you don't define - CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME, - CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot - should pretend to be a Linux device to it's target host. - - CONFIG_USBD_MANUFACTURER - Define this string as the name of your company for - - CONFIG_USBD_MANUFACTURER "my company" - - CONFIG_USBD_PRODUCT_NAME - Define this string as the name of your product - - CONFIG_USBD_PRODUCT_NAME "acme usb device" - - CONFIG_USBD_VENDORID - Define this as your assigned Vendor ID from the USB - Implementors Forum. This *must* be a genuine Vendor ID - to avoid polluting the USB namespace. - - CONFIG_USBD_VENDORID 0xFFFF - - CONFIG_USBD_PRODUCTID - Define this as the unique Product ID - for your device - - CONFIG_USBD_PRODUCTID 0xFFFF - -- ULPI Layer Support: - The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via - the generic ULPI layer. The generic layer accesses the ULPI PHY - via the platform viewport, so you need both the genric layer and - the viewport enabled. Currently only Chipidea/ARC based - viewport is supported. - To enable the ULPI layer support, define CONFIG_USB_ULPI and - CONFIG_USB_ULPI_VIEWPORT in your board configuration file. - If your ULPI phy needs a different reference clock than the - standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to - the appropriate value in Hz. - -- MMC Support: - The MMC controller on the Intel PXA is supported. To - enable this define CONFIG_MMC. The MMC can be - accessed from the boot prompt by mapping the device - to physical memory similar to flash. Command line is - enabled with CONFIG_CMD_MMC. The MMC driver also works with - the FAT fs. This is enabled with CONFIG_CMD_FAT. - - CONFIG_SH_MMCIF - Support for Renesas on-chip MMCIF controller - - CONFIG_SH_MMCIF_ADDR - Define the base address of MMCIF registers - - CONFIG_SH_MMCIF_CLK - Define the clock frequency for MMCIF - -- USB Device Firmware Update (DFU) class support: - CONFIG_DFU_FUNCTION - This enables the USB portion of the DFU USB class - - CONFIG_CMD_DFU - This enables the command "dfu" which is used to have - U-Boot create a DFU class device via USB. This command - requires that the "dfu_alt_info" environment variable be - set and define the alt settings to expose to the host. - - CONFIG_DFU_MMC - This enables support for exposing (e)MMC devices via DFU. - - CONFIG_DFU_NAND - This enables support for exposing NAND devices via DFU. - - CONFIG_DFU_RAM - This enables support for exposing RAM via DFU. - Note: DFU spec refer to non-volatile memory usage, but - allow usages beyond the scope of spec - here RAM usage, - one that would help mostly the developer. - - CONFIG_SYS_DFU_DATA_BUF_SIZE - Dfu transfer uses a buffer before writing data to the - raw storage device. Make the size (in bytes) of this buffer - configurable. The size of this buffer is also configurable - through the "dfu_bufsiz" environment variable. - - CONFIG_SYS_DFU_MAX_FILE_SIZE - When updating files rather than the raw storage device, - we use a static buffer to copy the file into and then write - the buffer once we've been given the whole file. Define - this to the maximum filesize (in bytes) for the buffer. - Default is 4 MiB if undefined. - - DFU_DEFAULT_POLL_TIMEOUT - Poll timeout [ms], is the timeout a device can send to the - host. The host must wait for this timeout before sending - a subsequent DFU_GET_STATUS request to the device. - - DFU_MANIFEST_POLL_TIMEOUT - Poll timeout [ms], which the device sends to the host when - entering dfuMANIFEST state. Host waits this timeout, before - sending again an USB request to the device. - -- Journaling Flash filesystem support: - CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE, - CONFIG_JFFS2_NAND_DEV - Define these for a default partition on a NAND device - - CONFIG_SYS_JFFS2_FIRST_SECTOR, - CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS - Define these for a default partition on a NOR device - - CONFIG_SYS_JFFS_CUSTOM_PART - Define this to create an own partition. You have to provide a - function struct part_info* jffs2_part_info(int part_num) - - If you define only one JFFS2 partition you may also want to - #define CONFIG_SYS_JFFS_SINGLE_PART 1 - to disable the command chpart. This is the default when you - have not defined a custom partition - -- FAT(File Allocation Table) filesystem write function support: - CONFIG_FAT_WRITE - - Define this to enable support for saving memory data as a - file in FAT formatted partition. - - This will also enable the command "fatwrite" enabling the - user to write files to FAT. - -CBFS (Coreboot Filesystem) support - CONFIG_CMD_CBFS - - Define this to enable support for reading from a Coreboot - filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls - and cbfsload. - -- Keyboard Support: - CONFIG_ISA_KEYBOARD - - Define this to enable standard (PC-Style) keyboard - support - - CONFIG_I8042_KBD - Standard PC keyboard driver with US (is default) and - GERMAN key layout (switch via environment 'keymap=de') support. - Export function i8042_kbd_init, i8042_tstc and i8042_getc - for cfb_console. Supports cursor blinking. - - CONFIG_CROS_EC_KEYB - Enables a Chrome OS keyboard using the CROS_EC interface. - This uses CROS_EC to communicate with a second microcontroller - which provides key scans on request. - -- Video support: - CONFIG_VIDEO - - Define this to enable video support (for output to - video). - - CONFIG_VIDEO_CT69000 - - Enable Chips & Technologies 69000 Video chip - - CONFIG_VIDEO_SMI_LYNXEM - Enable Silicon Motion SMI 712/710/810 Video chip. The - video output is selected via environment 'videoout' - (1 = LCD and 2 = CRT). If videoout is undefined, CRT is - assumed. - - For the CT69000 and SMI_LYNXEM drivers, videomode is - selected via environment 'videomode'. Two different ways - are possible: - - "videomode=num" 'num' is a standard LiLo mode numbers. - Following standard modes are supported (* is default): - - Colors 640x480 800x600 1024x768 1152x864 1280x1024 - -------------+--------------------------------------------- - 8 bits | 0x301* 0x303 0x305 0x161 0x307 - 15 bits | 0x310 0x313 0x316 0x162 0x319 - 16 bits | 0x311 0x314 0x317 0x163 0x31A - 24 bits | 0x312 0x315 0x318 ? 0x31B - -------------+--------------------------------------------- - (i.e. setenv videomode 317; saveenv; reset;) - - - "videomode=bootargs" all the video parameters are parsed - from the bootargs. (See drivers/video/videomodes.c) - - - CONFIG_VIDEO_SED13806 - Enable Epson SED13806 driver. This driver supports 8bpp - and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP - or CONFIG_VIDEO_SED13806_16BPP - - CONFIG_FSL_DIU_FB - Enable the Freescale DIU video driver. Reference boards for - SOCs that have a DIU should define this macro to enable DIU - support, and should also define these other macros: - - CONFIG_SYS_DIU_ADDR - CONFIG_VIDEO - CONFIG_CMD_BMP - CONFIG_CFB_CONSOLE - CONFIG_VIDEO_SW_CURSOR - CONFIG_VGA_AS_SINGLE_DEVICE - CONFIG_VIDEO_LOGO - CONFIG_VIDEO_BMP_LOGO - - The DIU driver will look for the 'video-mode' environment - variable, and if defined, enable the DIU as a console during - boot. See the documentation file README.video for a - description of this variable. - - CONFIG_VIDEO_VGA - - Enable the VGA video / BIOS for x86. The alternative if you - are using coreboot is to use the coreboot frame buffer - driver. - - -- Keyboard Support: - CONFIG_KEYBOARD - - Define this to enable a custom keyboard support. - This simply calls drv_keyboard_init() which must be - defined in your board-specific files. - The only board using this so far is RBC823. - -- LCD Support: CONFIG_LCD - - Define this to enable LCD support (for output to LCD - display); also select one of the supported displays - by defining one of these: - - CONFIG_ATMEL_LCD: - - HITACHI TX09D70VM1CCA, 3.5", 240x320. - - CONFIG_NEC_NL6448AC33: - - NEC NL6448AC33-18. Active, color, single scan. - - CONFIG_NEC_NL6448BC20 - - NEC NL6448BC20-08. 6.5", 640x480. - Active, color, single scan. - - CONFIG_NEC_NL6448BC33_54 - - NEC NL6448BC33-54. 10.4", 640x480. - Active, color, single scan. - - CONFIG_SHARP_16x9 - - Sharp 320x240. Active, color, single scan. - It isn't 16x9, and I am not sure what it is. - - CONFIG_SHARP_LQ64D341 - - Sharp LQ64D341 display, 640x480. - Active, color, single scan. - - CONFIG_HLD1045 - - HLD1045 display, 640x480. - Active, color, single scan. - - CONFIG_OPTREX_BW - - Optrex CBL50840-2 NF-FW 99 22 M5 - or - Hitachi LMG6912RPFC-00T - or - Hitachi SP14Q002 - - 320x240. Black & white. - - Normally display is black on white background; define - CONFIG_SYS_WHITE_ON_BLACK to get it inverted. - - CONFIG_LCD_ALIGNMENT - - Normally the LCD is page-aligned (tyically 4KB). If this is - defined then the LCD will be aligned to this value instead. - For ARM it is sometimes useful to use MMU_SECTION_SIZE - here, since it is cheaper to change data cache settings on - a per-section basis. - - CONFIG_CONSOLE_SCROLL_LINES - - When the console need to be scrolled, this is the number of - lines to scroll by. It defaults to 1. Increasing this makes - the console jump but can help speed up operation when scrolling - is slow. - - CONFIG_LCD_BMP_RLE8 - - Support drawing of RLE8-compressed bitmaps on the LCD. - - CONFIG_I2C_EDID - - Enables an 'i2c edid' command which can read EDID - information over I2C from an attached LCD display. - -- Splash Screen Support: CONFIG_SPLASH_SCREEN - - If this option is set, the environment is checked for - a variable "splashimage". If found, the usual display - of logo, copyright and system information on the LCD - is suppressed and the BMP image at the address - specified in "splashimage" is loaded instead. The - console is redirected to the "nulldev", too. This - allows for a "silent" boot where a splash screen is - loaded very quickly after power-on. - - CONFIG_SPLASHIMAGE_GUARD - - If this option is set, then U-Boot will prevent the environment - variable "splashimage" from being set to a problematic address - (see README.displaying-bmps). - This option is useful for targets where, due to alignment - restrictions, an improperly aligned BMP image will cause a data - abort. If you think you will not have problems with unaligned - accesses (for example because your toolchain prevents them) - there is no need to set this option. - - CONFIG_SPLASH_SCREEN_ALIGN - - If this option is set the splash image can be freely positioned - on the screen. Environment variable "splashpos" specifies the - position as "x,y". If a positive number is given it is used as - number of pixel from left/top. If a negative number is given it - is used as number of pixel from right/bottom. You can also - specify 'm' for centering the image. - - Example: - setenv splashpos m,m - => image at center of screen - - setenv splashpos 30,20 - => image at x = 30 and y = 20 - - setenv splashpos -10,m - => vertically centered image - at x = dspWidth - bmpWidth - 9 - -- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP - - If this option is set, additionally to standard BMP - images, gzipped BMP images can be displayed via the - splashscreen support or the bmp command. - -- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8 - - If this option is set, 8-bit RLE compressed BMP images - can be displayed via the splashscreen support or the - bmp command. - -- Do compresssing for memory range: - CONFIG_CMD_ZIP - - If this option is set, it would use zlib deflate method - to compress the specified memory at its best effort. - -- Compression support: - CONFIG_GZIP - - Enabled by default to support gzip compressed images. - - CONFIG_BZIP2 - - If this option is set, support for bzip2 compressed - images is included. If not, only uncompressed and gzip - compressed images are supported. - - NOTE: the bzip2 algorithm requires a lot of RAM, so - the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should - be at least 4MB. - - CONFIG_LZMA - - If this option is set, support for lzma compressed - images is included. - - Note: The LZMA algorithm adds between 2 and 4KB of code and it - requires an amount of dynamic memory that is given by the - formula: - - (1846 + 768 << (lc + lp)) * sizeof(uint16) - - Where lc and lp stand for, respectively, Literal context bits - and Literal pos bits. - - This value is upper-bounded by 14MB in the worst case. Anyway, - for a ~4MB large kernel image, we have lc=3 and lp=0 for a - total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is - a very small buffer. - - Use the lzmainfo tool to determinate the lc and lp values and - then calculate the amount of needed dynamic memory (ensuring - the appropriate CONFIG_SYS_MALLOC_LEN value). - - CONFIG_LZO - - If this option is set, support for LZO compressed images - is included. - -- MII/PHY support: - CONFIG_PHY_ADDR - - The address of PHY on MII bus. - - CONFIG_PHY_CLOCK_FREQ (ppc4xx) - - The clock frequency of the MII bus - - CONFIG_PHY_GIGE - - If this option is set, support for speed/duplex - detection of gigabit PHY is included. - - CONFIG_PHY_RESET_DELAY - - Some PHY like Intel LXT971A need extra delay after - reset before any MII register access is possible. - For such PHY, set this option to the usec delay - required. (minimum 300usec for LXT971A) - - CONFIG_PHY_CMD_DELAY (ppc4xx) - - Some PHY like Intel LXT971A need extra delay after - command issued before MII status register can be read - -- Ethernet address: - CONFIG_ETHADDR - CONFIG_ETH1ADDR - CONFIG_ETH2ADDR - CONFIG_ETH3ADDR - CONFIG_ETH4ADDR - CONFIG_ETH5ADDR - - Define a default value for Ethernet address to use - for the respective Ethernet interface, in case this - is not determined automatically. - -- IP address: - CONFIG_IPADDR - - Define a default value for the IP address to use for - the default Ethernet interface, in case this is not - determined through e.g. bootp. - (Environment variable "ipaddr") - -- Server IP address: - CONFIG_SERVERIP - - Defines a default value for the IP address of a TFTP - server to contact when using the "tftboot" command. - (Environment variable "serverip") - - CONFIG_KEEP_SERVERADDR - - Keeps the server's MAC address, in the env 'serveraddr' - for passing to bootargs (like Linux's netconsole option) - -- Gateway IP address: - CONFIG_GATEWAYIP - - Defines a default value for the IP address of the - default router where packets to other networks are - sent to. - (Environment variable "gatewayip") - -- Subnet mask: - CONFIG_NETMASK - - Defines a default value for the subnet mask (or - routing prefix) which is used to determine if an IP - address belongs to the local subnet or needs to be - forwarded through a router. - (Environment variable "netmask") - -- Multicast TFTP Mode: - CONFIG_MCAST_TFTP - - Defines whether you want to support multicast TFTP as per - rfc-2090; for example to work with atftp. Lets lots of targets - tftp down the same boot image concurrently. Note: the Ethernet - driver in use must provide a function: mcast() to join/leave a - multicast group. - -- BOOTP Recovery Mode: - CONFIG_BOOTP_RANDOM_DELAY - - If you have many targets in a network that try to - boot using BOOTP, you may want to avoid that all - systems send out BOOTP requests at precisely the same - moment (which would happen for instance at recovery - from a power failure, when all systems will try to - boot, thus flooding the BOOTP server. Defining - CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be - inserted before sending out BOOTP requests. The - following delays are inserted then: - - 1st BOOTP request: delay 0 ... 1 sec - 2nd BOOTP request: delay 0 ... 2 sec - 3rd BOOTP request: delay 0 ... 4 sec - 4th and following - BOOTP requests: delay 0 ... 8 sec - -- DHCP Advanced Options: - You can fine tune the DHCP functionality by defining - CONFIG_BOOTP_* symbols: - - CONFIG_BOOTP_SUBNETMASK - CONFIG_BOOTP_GATEWAY - CONFIG_BOOTP_HOSTNAME - CONFIG_BOOTP_NISDOMAIN - CONFIG_BOOTP_BOOTPATH - CONFIG_BOOTP_BOOTFILESIZE - CONFIG_BOOTP_DNS - CONFIG_BOOTP_DNS2 - CONFIG_BOOTP_SEND_HOSTNAME - CONFIG_BOOTP_NTPSERVER - CONFIG_BOOTP_TIMEOFFSET - CONFIG_BOOTP_VENDOREX - CONFIG_BOOTP_MAY_FAIL - - CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip - environment variable, not the BOOTP server. - - CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found - after the configured retry count, the call will fail - instead of starting over. This can be used to fail over - to Link-local IP address configuration if the DHCP server - is not available. - - CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS - serverip from a DHCP server, it is possible that more - than one DNS serverip is offered to the client. - If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS - serverip will be stored in the additional environment - variable "dnsip2". The first DNS serverip is always - stored in the variable "dnsip", when CONFIG_BOOTP_DNS - is defined. - - CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable - to do a dynamic update of a DNS server. To do this, they - need the hostname of the DHCP requester. - If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content - of the "hostname" environment variable is passed as - option 12 to the DHCP server. - - CONFIG_BOOTP_DHCP_REQUEST_DELAY - - A 32bit value in microseconds for a delay between - receiving a "DHCP Offer" and sending the "DHCP Request". - This fixes a problem with certain DHCP servers that don't - respond 100% of the time to a "DHCP request". E.g. On an - AT91RM9200 processor running at 180MHz, this delay needed - to be *at least* 15,000 usec before a Windows Server 2003 - DHCP server would reply 100% of the time. I recommend at - least 50,000 usec to be safe. The alternative is to hope - that one of the retries will be successful but note that - the DHCP timeout and retry process takes a longer than - this delay. - - - Link-local IP address negotiation: - Negotiate with other link-local clients on the local network - for an address that doesn't require explicit configuration. - This is especially useful if a DHCP server cannot be guaranteed - to exist in all environments that the device must operate. - - See doc/README.link-local for more information. - - - CDP Options: - CONFIG_CDP_DEVICE_ID - - The device id used in CDP trigger frames. - - CONFIG_CDP_DEVICE_ID_PREFIX - - A two character string which is prefixed to the MAC address - of the device. - - CONFIG_CDP_PORT_ID - - A printf format string which contains the ascii name of - the port. Normally is set to "eth%d" which sets - eth0 for the first Ethernet, eth1 for the second etc. - - CONFIG_CDP_CAPABILITIES - - A 32bit integer which indicates the device capabilities; - 0x00000010 for a normal host which does not forwards. - - CONFIG_CDP_VERSION - - An ascii string containing the version of the software. - - CONFIG_CDP_PLATFORM - - An ascii string containing the name of the platform. - - CONFIG_CDP_TRIGGER - - A 32bit integer sent on the trigger. - - CONFIG_CDP_POWER_CONSUMPTION - - A 16bit integer containing the power consumption of the - device in .1 of milliwatts. - - CONFIG_CDP_APPLIANCE_VLAN_TYPE - - A byte containing the id of the VLAN. - -- Status LED: CONFIG_STATUS_LED - - Several configurations allow to display the current - status using a LED. For instance, the LED will blink - fast while running U-Boot code, stop blinking as - soon as a reply to a BOOTP request was received, and - start blinking slow once the Linux kernel is running - (supported by a status LED driver in the Linux - kernel). Defining CONFIG_STATUS_LED enables this - feature in U-Boot. - - Additional options: - - CONFIG_GPIO_LED - The status LED can be connected to a GPIO pin. - In such cases, the gpio_led driver can be used as a - status LED backend implementation. Define CONFIG_GPIO_LED - to include the gpio_led driver in the U-Boot binary. - - CONFIG_GPIO_LED_INVERTED_TABLE - Some GPIO connected LEDs may have inverted polarity in which - case the GPIO high value corresponds to LED off state and - GPIO low value corresponds to LED on state. - In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined - with a list of GPIO LEDs that have inverted polarity. - -- CAN Support: CONFIG_CAN_DRIVER - - Defining CONFIG_CAN_DRIVER enables CAN driver support - on those systems that support this (optional) - feature, like the TQM8xxL modules. - -- I2C Support: CONFIG_SYS_I2C - - This enable the NEW i2c subsystem, and will allow you to use - i2c commands at the u-boot command line (as long as you set - CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c - based realtime clock chips or other i2c devices. See - common/cmd_i2c.c for a description of the command line - interface. - - ported i2c driver to the new framework: - - drivers/i2c/soft_i2c.c: - - activate first bus with CONFIG_SYS_I2C_SOFT define - CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE - for defining speed and slave address - - activate second bus with I2C_SOFT_DECLARATIONS2 define - CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2 - for defining speed and slave address - - activate third bus with I2C_SOFT_DECLARATIONS3 define - CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3 - for defining speed and slave address - - activate fourth bus with I2C_SOFT_DECLARATIONS4 define - CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4 - for defining speed and slave address - - - drivers/i2c/fsl_i2c.c: - - activate i2c driver with CONFIG_SYS_I2C_FSL - define CONFIG_SYS_FSL_I2C_OFFSET for setting the register - offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and - CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first - bus. - - If your board supports a second fsl i2c bus, define - CONFIG_SYS_FSL_I2C2_OFFSET for the register offset - CONFIG_SYS_FSL_I2C2_SPEED for the speed and - CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the - second bus. - - - drivers/i2c/tegra_i2c.c: - - activate this driver with CONFIG_SYS_I2C_TEGRA - - This driver adds 4 i2c buses with a fix speed from - 100000 and the slave addr 0! - - - drivers/i2c/ppc4xx_i2c.c - - activate this driver with CONFIG_SYS_I2C_PPC4XX - - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0 - - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1 - - - drivers/i2c/i2c_mxc.c - - activate this driver with CONFIG_SYS_I2C_MXC - - define speed for bus 1 with CONFIG_SYS_MXC_I2C1_SPEED - - define slave for bus 1 with CONFIG_SYS_MXC_I2C1_SLAVE - - define speed for bus 2 with CONFIG_SYS_MXC_I2C2_SPEED - - define slave for bus 2 with CONFIG_SYS_MXC_I2C2_SLAVE - - define speed for bus 3 with CONFIG_SYS_MXC_I2C3_SPEED - - define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE - If thoses defines are not set, default value is 100000 - for speed, and 0 for slave. - - - drivers/i2c/rcar_i2c.c: - - activate this driver with CONFIG_SYS_I2C_RCAR - - This driver adds 4 i2c buses - - - CONFIG_SYS_RCAR_I2C0_BASE for setting the register channel 0 - - CONFIG_SYS_RCAR_I2C0_SPEED for for the speed channel 0 - - CONFIG_SYS_RCAR_I2C1_BASE for setting the register channel 1 - - CONFIG_SYS_RCAR_I2C1_SPEED for for the speed channel 1 - - CONFIG_SYS_RCAR_I2C2_BASE for setting the register channel 2 - - CONFIG_SYS_RCAR_I2C2_SPEED for for the speed channel 2 - - CONFIG_SYS_RCAR_I2C3_BASE for setting the register channel 3 - - CONFIG_SYS_RCAR_I2C3_SPEED for for the speed channel 3 - - CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS for number of i2c buses - - - drivers/i2c/sh_i2c.c: - - activate this driver with CONFIG_SYS_I2C_SH - - This driver adds from 2 to 5 i2c buses - - - CONFIG_SYS_I2C_SH_BASE0 for setting the register channel 0 - - CONFIG_SYS_I2C_SH_SPEED0 for for the speed channel 0 - - CONFIG_SYS_I2C_SH_BASE1 for setting the register channel 1 - - CONFIG_SYS_I2C_SH_SPEED1 for for the speed channel 1 - - CONFIG_SYS_I2C_SH_BASE2 for setting the register channel 2 - - CONFIG_SYS_I2C_SH_SPEED2 for for the speed channel 2 - - CONFIG_SYS_I2C_SH_BASE3 for setting the register channel 3 - - CONFIG_SYS_I2C_SH_SPEED3 for for the speed channel 3 - - CONFIG_SYS_I2C_SH_BASE4 for setting the register channel 4 - - CONFIG_SYS_I2C_SH_SPEED4 for for the speed channel 4 - - CONFIG_SYS_I2C_SH_BASE5 for setting the register channel 5 - - CONFIG_SYS_I2C_SH_SPEED5 for for the speed channel 5 - - CONFIF_SYS_I2C_SH_NUM_CONTROLLERS for nummber of i2c buses - - - drivers/i2c/omap24xx_i2c.c - - activate this driver with CONFIG_SYS_I2C_OMAP24XX - - CONFIG_SYS_OMAP24_I2C_SPEED speed channel 0 - - CONFIG_SYS_OMAP24_I2C_SLAVE slave addr channel 0 - - CONFIG_SYS_OMAP24_I2C_SPEED1 speed channel 1 - - CONFIG_SYS_OMAP24_I2C_SLAVE1 slave addr channel 1 - - CONFIG_SYS_OMAP24_I2C_SPEED2 speed channel 2 - - CONFIG_SYS_OMAP24_I2C_SLAVE2 slave addr channel 2 - - CONFIG_SYS_OMAP24_I2C_SPEED3 speed channel 3 - - CONFIG_SYS_OMAP24_I2C_SLAVE3 slave addr channel 3 - - CONFIG_SYS_OMAP24_I2C_SPEED4 speed channel 4 - - CONFIG_SYS_OMAP24_I2C_SLAVE4 slave addr channel 4 - - - drivers/i2c/zynq_i2c.c - - activate this driver with CONFIG_SYS_I2C_ZYNQ - - set CONFIG_SYS_I2C_ZYNQ_SPEED for speed setting - - set CONFIG_SYS_I2C_ZYNQ_SLAVE for slave addr - - - drivers/i2c/s3c24x0_i2c.c: - - activate this driver with CONFIG_SYS_I2C_S3C24X0 - - This driver adds i2c buses (11 for Exynos5250, Exynos5420 - 9 i2c buses for Exynos4 and 1 for S3C24X0 SoCs from Samsung) - with a fix speed from 100000 and the slave addr 0! - - additional defines: - - CONFIG_SYS_NUM_I2C_BUSES - Hold the number of i2c busses you want to use. If you - don't use/have i2c muxes on your i2c bus, this - is equal to CONFIG_SYS_NUM_I2C_ADAPTERS, and you can - omit this define. - - CONFIG_SYS_I2C_DIRECT_BUS - define this, if you don't use i2c muxes on your hardware. - if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can - omit this define. - - CONFIG_SYS_I2C_MAX_HOPS - define how many muxes are maximal consecutively connected - on one i2c bus. If you not use i2c muxes, omit this - define. - - CONFIG_SYS_I2C_BUSES - hold a list of busses you want to use, only used if - CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example - a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and - CONFIG_SYS_NUM_I2C_BUSES = 9: - - CONFIG_SYS_I2C_BUSES {{0, {I2C_NULL_HOP}}, \ - {0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \ - {0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \ - {0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \ - {0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \ - {0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \ - {1, {I2C_NULL_HOP}}, \ - {1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \ - {1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \ - } - - which defines - bus 0 on adapter 0 without a mux - bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1 - bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2 - bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3 - bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4 - bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5 - bus 6 on adapter 1 without a mux - bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1 - bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2 - - If you do not have i2c muxes on your board, omit this define. - -- Legacy I2C Support: CONFIG_HARD_I2C - - NOTE: It is intended to move drivers to CONFIG_SYS_I2C which - provides the following compelling advantages: - - - more than one i2c adapter is usable - - approved multibus support - - better i2c mux support - - ** Please consider updating your I2C driver now. ** - - These enable legacy I2C serial bus commands. Defining - CONFIG_HARD_I2C will include the appropriate I2C driver - for the selected CPU. - - This will allow you to use i2c commands at the u-boot - command line (as long as you set CONFIG_CMD_I2C in - CONFIG_COMMANDS) and communicate with i2c based realtime - clock chips. See common/cmd_i2c.c for a description of the - command line interface. - - CONFIG_HARD_I2C selects a hardware I2C controller. - - There are several other quantities that must also be - defined when you define CONFIG_HARD_I2C. - - In both cases you will need to define CONFIG_SYS_I2C_SPEED - to be the frequency (in Hz) at which you wish your i2c bus - to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie - the CPU's i2c node address). - - Now, the u-boot i2c code for the mpc8xx - (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node - and so its address should therefore be cleared to 0 (See, - eg, MPC823e User's Manual p.16-473). So, set - CONFIG_SYS_I2C_SLAVE to 0. - - CONFIG_SYS_I2C_INIT_MPC5XXX - - When a board is reset during an i2c bus transfer - chips might think that the current transfer is still - in progress. Reset the slave devices by sending start - commands until the slave device responds. - - That's all that's required for CONFIG_HARD_I2C. - - If you use the software i2c interface (CONFIG_SYS_I2C_SOFT) - then the following macros need to be defined (examples are - from include/configs/lwmon.h): - - I2C_INIT - - (Optional). Any commands necessary to enable the I2C - controller or configure ports. - - eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) - - I2C_PORT - - (Only for MPC8260 CPU). The I/O port to use (the code - assumes both bits are on the same port). Valid values - are 0..3 for ports A..D. - - I2C_ACTIVE - - The code necessary to make the I2C data line active - (driven). If the data line is open collector, this - define can be null. - - eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) - - I2C_TRISTATE - - The code necessary to make the I2C data line tri-stated - (inactive). If the data line is open collector, this - define can be null. - - eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) - - I2C_READ - - Code that returns true if the I2C data line is high, - false if it is low. - - eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) - - I2C_SDA(bit) - - If <bit> is true, sets the I2C data line high. If it - is false, it clears it (low). - - eg: #define I2C_SDA(bit) \ - if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ - else immr->im_cpm.cp_pbdat &= ~PB_SDA - - I2C_SCL(bit) - - If <bit> is true, sets the I2C clock line high. If it - is false, it clears it (low). - - eg: #define I2C_SCL(bit) \ - if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ - else immr->im_cpm.cp_pbdat &= ~PB_SCL - - I2C_DELAY - - This delay is invoked four times per clock cycle so this - controls the rate of data transfer. The data rate thus - is 1 / (I2C_DELAY * 4). Often defined to be something - like: - - #define I2C_DELAY udelay(2) - - CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA - - If your arch supports the generic GPIO framework (asm/gpio.h), - then you may alternatively define the two GPIOs that are to be - used as SCL / SDA. Any of the previous I2C_xxx macros will - have GPIO-based defaults assigned to them as appropriate. - - You should define these to the GPIO value as given directly to - the generic GPIO functions. - - CONFIG_SYS_I2C_INIT_BOARD - - When a board is reset during an i2c bus transfer - chips might think that the current transfer is still - in progress. On some boards it is possible to access - the i2c SCLK line directly, either by using the - processor pin as a GPIO or by having a second pin - connected to the bus. If this option is defined a - custom i2c_init_board() routine in boards/xxx/board.c - is run early in the boot sequence. - - CONFIG_SYS_I2C_BOARD_LATE_INIT - - An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is - defined a custom i2c_board_late_init() routine in - boards/xxx/board.c is run AFTER the operations in i2c_init() - is completed. This callpoint can be used to unreset i2c bus - using CPU i2c controller register accesses for CPUs whose i2c - controller provide such a method. It is called at the end of - i2c_init() to allow i2c_init operations to setup the i2c bus - controller on the CPU (e.g. setting bus speed & slave address). - - CONFIG_I2CFAST (PPC405GP|PPC405EP only) - - This option enables configuration of bi_iic_fast[] flags - in u-boot bd_info structure based on u-boot environment - variable "i2cfast". (see also i2cfast) - - CONFIG_I2C_MULTI_BUS - - This option allows the use of multiple I2C buses, each of which - must have a controller. At any point in time, only one bus is - active. To switch to a different bus, use the 'i2c dev' command. - Note that bus numbering is zero-based. - - CONFIG_SYS_I2C_NOPROBES - - This option specifies a list of I2C devices that will be skipped - when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS - is set, specify a list of bus-device pairs. Otherwise, specify - a 1D array of device addresses - - e.g. - #undef CONFIG_I2C_MULTI_BUS - #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68} - - will skip addresses 0x50 and 0x68 on a board with one I2C bus - - #define CONFIG_I2C_MULTI_BUS - #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}} - - will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1 - - CONFIG_SYS_SPD_BUS_NUM - - If defined, then this indicates the I2C bus number for DDR SPD. - If not defined, then U-Boot assumes that SPD is on I2C bus 0. - - CONFIG_SYS_RTC_BUS_NUM - - If defined, then this indicates the I2C bus number for the RTC. - If not defined, then U-Boot assumes that RTC is on I2C bus 0. - - CONFIG_SYS_DTT_BUS_NUM - - If defined, then this indicates the I2C bus number for the DTT. - If not defined, then U-Boot assumes that DTT is on I2C bus 0. - - CONFIG_SYS_I2C_DTT_ADDR: - - If defined, specifies the I2C address of the DTT device. - If not defined, then U-Boot uses predefined value for - specified DTT device. - - CONFIG_SOFT_I2C_READ_REPEATED_START - - defining this will force the i2c_read() function in - the soft_i2c driver to perform an I2C repeated start - between writing the address pointer and reading the - data. If this define is omitted the default behaviour - of doing a stop-start sequence will be used. Most I2C - devices can use either method, but some require one or - the other. - -- SPI Support: CONFIG_SPI - - Enables SPI driver (so far only tested with - SPI EEPROM, also an instance works with Crystal A/D and - D/As on the SACSng board) - - CONFIG_SH_SPI - - Enables the driver for SPI controller on SuperH. Currently - only SH7757 is supported. - - CONFIG_SPI_X - - Enables extended (16-bit) SPI EEPROM addressing. - (symmetrical to CONFIG_I2C_X) - - CONFIG_SOFT_SPI - - Enables a software (bit-bang) SPI driver rather than - using hardware support. This is a general purpose - driver that only requires three general I/O port pins - (two outputs, one input) to function. If this is - defined, the board configuration must define several - SPI configuration items (port pins to use, etc). For - an example, see include/configs/sacsng.h. - - CONFIG_HARD_SPI - - Enables a hardware SPI driver for general-purpose reads - and writes. As with CONFIG_SOFT_SPI, the board configuration - must define a list of chip-select function pointers. - Currently supported on some MPC8xxx processors. For an - example, see include/configs/mpc8349emds.h. - - CONFIG_MXC_SPI - - Enables the driver for the SPI controllers on i.MX and MXC - SoCs. Currently i.MX31/35/51 are supported. - -- FPGA Support: CONFIG_FPGA - - Enables FPGA subsystem. - - CONFIG_FPGA_<vendor> - - Enables support for specific chip vendors. - (ALTERA, XILINX) - - CONFIG_FPGA_<family> - - Enables support for FPGA family. - (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX) - - CONFIG_FPGA_COUNT - - Specify the number of FPGA devices to support. - - CONFIG_SYS_FPGA_PROG_FEEDBACK - - Enable printing of hash marks during FPGA configuration. - - CONFIG_SYS_FPGA_CHECK_BUSY - - Enable checks on FPGA configuration interface busy - status by the configuration function. This option - will require a board or device specific function to - be written. - - CONFIG_FPGA_DELAY - - If defined, a function that provides delays in the FPGA - configuration driver. - - CONFIG_SYS_FPGA_CHECK_CTRLC - Allow Control-C to interrupt FPGA configuration - - CONFIG_SYS_FPGA_CHECK_ERROR - - Check for configuration errors during FPGA bitfile - loading. For example, abort during Virtex II - configuration if the INIT_B line goes low (which - indicated a CRC error). - - CONFIG_SYS_FPGA_WAIT_INIT - - Maximum time to wait for the INIT_B line to deassert - after PROB_B has been deasserted during a Virtex II - FPGA configuration sequence. The default time is 500 - ms. - - CONFIG_SYS_FPGA_WAIT_BUSY - - Maximum time to wait for BUSY to deassert during - Virtex II FPGA configuration. The default is 5 ms. - - CONFIG_SYS_FPGA_WAIT_CONFIG - - Time to wait after FPGA configuration. The default is - 200 ms. - -- Configuration Management: - CONFIG_IDENT_STRING - - If defined, this string will be added to the U-Boot - version information (U_BOOT_VERSION) - -- Vendor Parameter Protection: - - U-Boot considers the values of the environment - variables "serial#" (Board Serial Number) and - "ethaddr" (Ethernet Address) to be parameters that - are set once by the board vendor / manufacturer, and - protects these variables from casual modification by - the user. Once set, these variables are read-only, - and write or delete attempts are rejected. You can - change this behaviour: - - If CONFIG_ENV_OVERWRITE is #defined in your config - file, the write protection for vendor parameters is - completely disabled. Anybody can change or delete - these parameters. - - Alternatively, if you #define _both_ CONFIG_ETHADDR - _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default - Ethernet address is installed in the environment, - which can be changed exactly ONCE by the user. [The - serial# is unaffected by this, i. e. it remains - read-only.] - - The same can be accomplished in a more flexible way - for any variable by configuring the type of access - to allow for those variables in the ".flags" variable - or define CONFIG_ENV_FLAGS_LIST_STATIC. - -- Protected RAM: - CONFIG_PRAM - - Define this variable to enable the reservation of - "protected RAM", i. e. RAM which is not overwritten - by U-Boot. Define CONFIG_PRAM to hold the number of - kB you want to reserve for pRAM. You can overwrite - this default value by defining an environment - variable "pram" to the number of kB you want to - reserve. Note that the board info structure will - still show the full amount of RAM. If pRAM is - reserved, a new environment variable "mem" will - automatically be defined to hold the amount of - remaining RAM in a form that can be passed as boot - argument to Linux, for instance like that: - - setenv bootargs ... mem=\${mem} - saveenv - - This way you can tell Linux not to use this memory, - either, which results in a memory region that will - not be affected by reboots. - - *WARNING* If your board configuration uses automatic - detection of the RAM size, you must make sure that - this memory test is non-destructive. So far, the - following board configurations are known to be - "pRAM-clean": - - IVMS8, IVML24, SPD8xx, TQM8xxL, - HERMES, IP860, RPXlite, LWMON, - FLAGADM, TQM8260 - -- Access to physical memory region (> 4GB) - Some basic support is provided for operations on memory not - normally accessible to U-Boot - e.g. some architectures - support access to more than 4GB of memory on 32-bit - machines using physical address extension or similar. - Define CONFIG_PHYSMEM to access this basic support, which - currently only supports clearing the memory. - -- Error Recovery: - CONFIG_PANIC_HANG - - Define this variable to stop the system in case of a - fatal error, so that you have to reset it manually. - This is probably NOT a good idea for an embedded - system where you want the system to reboot - automatically as fast as possible, but it may be - useful during development since you can try to debug - the conditions that lead to the situation. - - CONFIG_NET_RETRY_COUNT - - This variable defines the number of retries for - network operations like ARP, RARP, TFTP, or BOOTP - before giving up the operation. If not defined, a - default value of 5 is used. - - CONFIG_ARP_TIMEOUT - - Timeout waiting for an ARP reply in milliseconds. - - CONFIG_NFS_TIMEOUT - - Timeout in milliseconds used in NFS protocol. - If you encounter "ERROR: Cannot umount" in nfs command, - try longer timeout such as - #define CONFIG_NFS_TIMEOUT 10000UL - -- Command Interpreter: - CONFIG_AUTO_COMPLETE - - Enable auto completion of commands using TAB. - - Note that this feature has NOT been implemented yet - for the "hush" shell. - - - CONFIG_SYS_HUSH_PARSER - - Define this variable to enable the "hush" shell (from - Busybox) as command line interpreter, thus enabling - powerful command line syntax like - if...then...else...fi conditionals or `&&' and '||' - constructs ("shell scripts"). - - If undefined, you get the old, much simpler behaviour - with a somewhat smaller memory footprint. - - - CONFIG_SYS_PROMPT_HUSH_PS2 - - This defines the secondary prompt string, which is - printed when the command interpreter needs more input - to complete a command. Usually "> ". - - Note: - - In the current implementation, the local variables - space and global environment variables space are - separated. Local variables are those you define by - simply typing `name=value'. To access a local - variable later on, you have write `$name' or - `${name}'; to execute the contents of a variable - directly type `$name' at the command prompt. - - Global environment variables are those you use - setenv/printenv to work with. To run a command stored - in such a variable, you need to use the run command, - and you must not use the '$' sign to access them. - - To store commands and special characters in a - variable, please use double quotation marks - surrounding the whole text of the variable, instead - of the backslashes before semicolons and special - symbols. - -- Commandline Editing and History: - CONFIG_CMDLINE_EDITING - - Enable editing and History functions for interactive - commandline input operations - -- Default Environment: - CONFIG_EXTRA_ENV_SETTINGS - - Define this to contain any number of null terminated - strings (variable = value pairs) that will be part of - the default environment compiled into the boot image. - - For example, place something like this in your - board's config file: - - #define CONFIG_EXTRA_ENV_SETTINGS \ - "myvar1=value1\0" \ - "myvar2=value2\0" - - Warning: This method is based on knowledge about the - internal format how the environment is stored by the - U-Boot code. This is NOT an official, exported - interface! Although it is unlikely that this format - will change soon, there is no guarantee either. - You better know what you are doing here. - - Note: overly (ab)use of the default environment is - discouraged. Make sure to check other ways to preset - the environment like the "source" command or the - boot command first. - - CONFIG_ENV_VARS_UBOOT_CONFIG - - Define this in order to add variables describing the - U-Boot build configuration to the default environment. - These will be named arch, cpu, board, vendor, and soc. - - Enabling this option will cause the following to be defined: - - - CONFIG_SYS_ARCH - - CONFIG_SYS_CPU - - CONFIG_SYS_BOARD - - CONFIG_SYS_VENDOR - - CONFIG_SYS_SOC - - CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG - - Define this in order to add variables describing certain - run-time determined information about the hardware to the - environment. These will be named board_name, board_rev. - - CONFIG_DELAY_ENVIRONMENT - - Normally the environment is loaded when the board is - intialised so that it is available to U-Boot. This inhibits - that so that the environment is not available until - explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL - this is instead controlled by the value of - /config/load-environment. - -- DataFlash Support: - CONFIG_HAS_DATAFLASH - - Defining this option enables DataFlash features and - allows to read/write in Dataflash via the standard - commands cp, md... - -- Serial Flash support - CONFIG_CMD_SF - - Defining this option enables SPI flash commands - 'sf probe/read/write/erase/update'. - - Usage requires an initial 'probe' to define the serial - flash parameters, followed by read/write/erase/update - commands. - - The following defaults may be provided by the platform - to handle the common case when only a single serial - flash is present on the system. - - CONFIG_SF_DEFAULT_BUS Bus identifier - CONFIG_SF_DEFAULT_CS Chip-select - CONFIG_SF_DEFAULT_MODE (see include/spi.h) - CONFIG_SF_DEFAULT_SPEED in Hz - - CONFIG_CMD_SF_TEST - - Define this option to include a destructive SPI flash - test ('sf test'). - - CONFIG_SPI_FLASH_BAR Ban/Extended Addr Reg - - Define this option to use the Bank addr/Extended addr - support on SPI flashes which has size > 16Mbytes. - - CONFIG_SF_DUAL_FLASH Dual flash memories - - Define this option to use dual flash support where two flash - memories can be connected with a given cs line. - currently Xilinx Zynq qspi support these type of connections. - -- SystemACE Support: - CONFIG_SYSTEMACE - - Adding this option adds support for Xilinx SystemACE - chips attached via some sort of local bus. The address - of the chip must also be defined in the - CONFIG_SYS_SYSTEMACE_BASE macro. For example: - - #define CONFIG_SYSTEMACE - #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000 - - When SystemACE support is added, the "ace" device type - becomes available to the fat commands, i.e. fatls. - -- TFTP Fixed UDP Port: - CONFIG_TFTP_PORT - - If this is defined, the environment variable tftpsrcp - is used to supply the TFTP UDP source port value. - If tftpsrcp isn't defined, the normal pseudo-random port - number generator is used. - - Also, the environment variable tftpdstp is used to supply - the TFTP UDP destination port value. If tftpdstp isn't - defined, the normal port 69 is used. - - The purpose for tftpsrcp is to allow a TFTP server to - blindly start the TFTP transfer using the pre-configured - target IP address and UDP port. This has the effect of - "punching through" the (Windows XP) firewall, allowing - the remainder of the TFTP transfer to proceed normally. - A better solution is to properly configure the firewall, - but sometimes that is not allowed. - -- Hashing support: - CONFIG_CMD_HASH - - This enables a generic 'hash' command which can produce - hashes / digests from a few algorithms (e.g. SHA1, SHA256). - - CONFIG_HASH_VERIFY - - Enable the hash verify command (hash -v). This adds to code - size a little. - - CONFIG_SHA1 - support SHA1 hashing - CONFIG_SHA256 - support SHA256 hashing - - Note: There is also a sha1sum command, which should perhaps - be deprecated in favour of 'hash sha1'. - -- Freescale i.MX specific commands: - CONFIG_CMD_HDMIDETECT - This enables 'hdmidet' command which returns true if an - HDMI monitor is detected. This command is i.MX 6 specific. - - CONFIG_CMD_BMODE - This enables the 'bmode' (bootmode) command for forcing - a boot from specific media. - - This is useful for forcing the ROM's usb downloader to - activate upon a watchdog reset which is nice when iterating - on U-Boot. Using the reset button or running bmode normal - will set it back to normal. This command currently - supports i.MX53 and i.MX6. - -- Signing support: - CONFIG_RSA - - This enables the RSA algorithm used for FIT image verification - in U-Boot. See doc/uImage.FIT/signature.txt for more information. - - The signing part is build into mkimage regardless of this - option. - -- bootcount support: - CONFIG_BOOTCOUNT_LIMIT - - This enables the bootcounter support, see: - http://www.denx.de/wiki/DULG/UBootBootCountLimit - - CONFIG_AT91SAM9XE - enable special bootcounter support on at91sam9xe based boards. - CONFIG_BLACKFIN - enable special bootcounter support on blackfin based boards. - CONFIG_SOC_DA8XX - enable special bootcounter support on da850 based boards. - CONFIG_BOOTCOUNT_RAM - enable support for the bootcounter in RAM - CONFIG_BOOTCOUNT_I2C - enable support for the bootcounter on an i2c (like RTC) device. - CONFIG_SYS_I2C_RTC_ADDR = i2c chip address - CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for - the bootcounter. - CONFIG_BOOTCOUNT_ALEN = address len - -- Show boot progress: - CONFIG_SHOW_BOOT_PROGRESS - - Defining this option allows to add some board- - specific code (calling a user-provided function - "show_boot_progress(int)") that enables you to show - the system's boot progress on some display (for - example, some LED's) on your board. At the moment, - the following checkpoints are implemented: - -- Detailed boot stage timing - CONFIG_BOOTSTAGE - Define this option to get detailed timing of each stage - of the boot process. - - CONFIG_BOOTSTAGE_USER_COUNT - This is the number of available user bootstage records. - Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...) - a new ID will be allocated from this stash. If you exceed - the limit, recording will stop. - - CONFIG_BOOTSTAGE_REPORT - Define this to print a report before boot, similar to this: - - Timer summary in microseconds: - Mark Elapsed Stage - 0 0 reset - 3,575,678 3,575,678 board_init_f start - 3,575,695 17 arch_cpu_init A9 - 3,575,777 82 arch_cpu_init done - 3,659,598 83,821 board_init_r start - 3,910,375 250,777 main_loop - 29,916,167 26,005,792 bootm_start - 30,361,327 445,160 start_kernel - - CONFIG_CMD_BOOTSTAGE - Add a 'bootstage' command which supports printing a report - and un/stashing of bootstage data. - - CONFIG_BOOTSTAGE_FDT - Stash the bootstage information in the FDT. A root 'bootstage' - node is created with each bootstage id as a child. Each child - has a 'name' property and either 'mark' containing the - mark time in microsecond, or 'accum' containing the - accumulated time for that bootstage id in microseconds. - For example: - - bootstage { - 154 { - name = "board_init_f"; - mark = <3575678>; - }; - 170 { - name = "lcd"; - accum = <33482>; - }; - }; - - Code in the Linux kernel can find this in /proc/devicetree. - -Legacy uImage format: - - Arg Where When - 1 common/cmd_bootm.c before attempting to boot an image - -1 common/cmd_bootm.c Image header has bad magic number - 2 common/cmd_bootm.c Image header has correct magic number - -2 common/cmd_bootm.c Image header has bad checksum - 3 common/cmd_bootm.c Image header has correct checksum - -3 common/cmd_bootm.c Image data has bad checksum - 4 common/cmd_bootm.c Image data has correct checksum - -4 common/cmd_bootm.c Image is for unsupported architecture - 5 common/cmd_bootm.c Architecture check OK - -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi) - 6 common/cmd_bootm.c Image Type check OK - -6 common/cmd_bootm.c gunzip uncompression error - -7 common/cmd_bootm.c Unimplemented compression type - 7 common/cmd_bootm.c Uncompression OK - 8 common/cmd_bootm.c No uncompress/copy overwrite error - -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX) - - 9 common/image.c Start initial ramdisk verification - -10 common/image.c Ramdisk header has bad magic number - -11 common/image.c Ramdisk header has bad checksum - 10 common/image.c Ramdisk header is OK - -12 common/image.c Ramdisk data has bad checksum - 11 common/image.c Ramdisk data has correct checksum - 12 common/image.c Ramdisk verification complete, start loading - -13 common/image.c Wrong Image Type (not PPC Linux ramdisk) - 13 common/image.c Start multifile image verification - 14 common/image.c No initial ramdisk, no multifile, continue. - - 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS - - -30 arch/powerpc/lib/board.c Fatal error, hang the system - -31 post/post.c POST test failed, detected by post_output_backlog() - -32 post/post.c POST test failed, detected by post_run_single() - - 34 common/cmd_doc.c before loading a Image from a DOC device - -35 common/cmd_doc.c Bad usage of "doc" command - 35 common/cmd_doc.c correct usage of "doc" command - -36 common/cmd_doc.c No boot device - 36 common/cmd_doc.c correct boot device - -37 common/cmd_doc.c Unknown Chip ID on boot device - 37 common/cmd_doc.c correct chip ID found, device available - -38 common/cmd_doc.c Read Error on boot device - 38 common/cmd_doc.c reading Image header from DOC device OK - -39 common/cmd_doc.c Image header has bad magic number - 39 common/cmd_doc.c Image header has correct magic number - -40 common/cmd_doc.c Error reading Image from DOC device - 40 common/cmd_doc.c Image header has correct magic number - 41 common/cmd_ide.c before loading a Image from a IDE device - -42 common/cmd_ide.c Bad usage of "ide" command - 42 common/cmd_ide.c correct usage of "ide" command - -43 common/cmd_ide.c No boot device - 43 common/cmd_ide.c boot device found - -44 common/cmd_ide.c Device not available - 44 common/cmd_ide.c Device available - -45 common/cmd_ide.c wrong partition selected - 45 common/cmd_ide.c partition selected - -46 common/cmd_ide.c Unknown partition table - 46 common/cmd_ide.c valid partition table found - -47 common/cmd_ide.c Invalid partition type - 47 common/cmd_ide.c correct partition type - -48 common/cmd_ide.c Error reading Image Header on boot device - 48 common/cmd_ide.c reading Image Header from IDE device OK - -49 common/cmd_ide.c Image header has bad magic number - 49 common/cmd_ide.c Image header has correct magic number - -50 common/cmd_ide.c Image header has bad checksum - 50 common/cmd_ide.c Image header has correct checksum - -51 common/cmd_ide.c Error reading Image from IDE device - 51 common/cmd_ide.c reading Image from IDE device OK - 52 common/cmd_nand.c before loading a Image from a NAND device - -53 common/cmd_nand.c Bad usage of "nand" command - 53 common/cmd_nand.c correct usage of "nand" command - -54 common/cmd_nand.c No boot device - 54 common/cmd_nand.c boot device found - -55 common/cmd_nand.c Unknown Chip ID on boot device - 55 common/cmd_nand.c correct chip ID found, device available - -56 common/cmd_nand.c Error reading Image Header on boot device - 56 common/cmd_nand.c reading Image Header from NAND device OK - -57 common/cmd_nand.c Image header has bad magic number - 57 common/cmd_nand.c Image header has correct magic number - -58 common/cmd_nand.c Error reading Image from NAND device - 58 common/cmd_nand.c reading Image from NAND device OK - - -60 common/env_common.c Environment has a bad CRC, using default - - 64 net/eth.c starting with Ethernet configuration. - -64 net/eth.c no Ethernet found. - 65 net/eth.c Ethernet found. - - -80 common/cmd_net.c usage wrong - 80 common/cmd_net.c before calling NetLoop() - -81 common/cmd_net.c some error in NetLoop() occurred - 81 common/cmd_net.c NetLoop() back without error - -82 common/cmd_net.c size == 0 (File with size 0 loaded) - 82 common/cmd_net.c trying automatic boot - 83 common/cmd_net.c running "source" command - -83 common/cmd_net.c some error in automatic boot or "source" command - 84 common/cmd_net.c end without errors - -FIT uImage format: - - Arg Where When - 100 common/cmd_bootm.c Kernel FIT Image has correct format - -100 common/cmd_bootm.c Kernel FIT Image has incorrect format - 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration - -101 common/cmd_bootm.c Can't get configuration for kernel subimage - 102 common/cmd_bootm.c Kernel unit name specified - -103 common/cmd_bootm.c Can't get kernel subimage node offset - 103 common/cmd_bootm.c Found configuration node - 104 common/cmd_bootm.c Got kernel subimage node offset - -104 common/cmd_bootm.c Kernel subimage hash verification failed - 105 common/cmd_bootm.c Kernel subimage hash verification OK - -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture - 106 common/cmd_bootm.c Architecture check OK - -106 common/cmd_bootm.c Kernel subimage has wrong type - 107 common/cmd_bootm.c Kernel subimage type OK - -107 common/cmd_bootm.c Can't get kernel subimage data/size - 108 common/cmd_bootm.c Got kernel subimage data/size - -108 common/cmd_bootm.c Wrong image type (not legacy, FIT) - -109 common/cmd_bootm.c Can't get kernel subimage type - -110 common/cmd_bootm.c Can't get kernel subimage comp - -111 common/cmd_bootm.c Can't get kernel subimage os - -112 common/cmd_bootm.c Can't get kernel subimage load address - -113 common/cmd_bootm.c Image uncompress/copy overwrite error - - 120 common/image.c Start initial ramdisk verification - -120 common/image.c Ramdisk FIT image has incorrect format - 121 common/image.c Ramdisk FIT image has correct format - 122 common/image.c No ramdisk subimage unit name, using configuration - -122 common/image.c Can't get configuration for ramdisk subimage - 123 common/image.c Ramdisk unit name specified - -124 common/image.c Can't get ramdisk subimage node offset - 125 common/image.c Got ramdisk subimage node offset - -125 common/image.c Ramdisk subimage hash verification failed - 126 common/image.c Ramdisk subimage hash verification OK - -126 common/image.c Ramdisk subimage for unsupported architecture - 127 common/image.c Architecture check OK - -127 common/image.c Can't get ramdisk subimage data/size - 128 common/image.c Got ramdisk subimage data/size - 129 common/image.c Can't get ramdisk load address - -129 common/image.c Got ramdisk load address - - -130 common/cmd_doc.c Incorrect FIT image format - 131 common/cmd_doc.c FIT image format OK - - -140 common/cmd_ide.c Incorrect FIT image format - 141 common/cmd_ide.c FIT image format OK - - -150 common/cmd_nand.c Incorrect FIT image format - 151 common/cmd_nand.c FIT image format OK - -- FIT image support: - CONFIG_FIT - Enable support for the FIT uImage format. - - CONFIG_FIT_BEST_MATCH - When no configuration is explicitly selected, default to the - one whose fdt's compatibility field best matches that of - U-Boot itself. A match is considered "best" if it matches the - most specific compatibility entry of U-Boot's fdt's root node. - The order of entries in the configuration's fdt is ignored. - - CONFIG_FIT_SIGNATURE - This option enables signature verification of FIT uImages, - using a hash signed and verified using RSA. See - doc/uImage.FIT/signature.txt for more details. - -- Standalone program support: - CONFIG_STANDALONE_LOAD_ADDR - - This option defines a board specific value for the - address where standalone program gets loaded, thus - overwriting the architecture dependent default - settings. - -- Frame Buffer Address: - CONFIG_FB_ADDR - - Define CONFIG_FB_ADDR if you want to use specific - address for frame buffer. This is typically the case - when using a graphics controller has separate video - memory. U-Boot will then place the frame buffer at - the given address instead of dynamically reserving it - in system RAM by calling lcd_setmem(), which grabs - the memory for the frame buffer depending on the - configured panel size. - - Please see board_init_f function. - -- Automatic software updates via TFTP server - CONFIG_UPDATE_TFTP - CONFIG_UPDATE_TFTP_CNT_MAX - CONFIG_UPDATE_TFTP_MSEC_MAX - - These options enable and control the auto-update feature; - for a more detailed description refer to doc/README.update. - -- MTD Support (mtdparts command, UBI support) - CONFIG_MTD_DEVICE - - Adds the MTD device infrastructure from the Linux kernel. - Needed for mtdparts command support. - - CONFIG_MTD_PARTITIONS - - Adds the MTD partitioning infrastructure from the Linux - kernel. Needed for UBI support. - -- UBI support - CONFIG_CMD_UBI - - Adds commands for interacting with MTD partitions formatted - with the UBI flash translation layer - - Requires also defining CONFIG_RBTREE - - CONFIG_UBI_SILENCE_MSG - - Make the verbose messages from UBI stop printing. This leaves - warnings and errors enabled. - -- UBIFS support - CONFIG_CMD_UBIFS - - Adds commands for interacting with UBI volumes formatted as - UBIFS. UBIFS is read-only in u-boot. - - Requires UBI support as well as CONFIG_LZO - - CONFIG_UBIFS_SILENCE_MSG - - Make the verbose messages from UBIFS stop printing. This leaves - warnings and errors enabled. - -- SPL framework - CONFIG_SPL - Enable building of SPL globally. - - CONFIG_SPL_LDSCRIPT - LDSCRIPT for linking the SPL binary. - - CONFIG_SPL_MAX_FOOTPRINT - Maximum size in memory allocated to the SPL, BSS included. - When defined, the linker checks that the actual memory - used by SPL from _start to __bss_end does not exceed it. - CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE - must not be both defined at the same time. - - CONFIG_SPL_MAX_SIZE - Maximum size of the SPL image (text, data, rodata, and - linker lists sections), BSS excluded. - When defined, the linker checks that the actual size does - not exceed it. - - CONFIG_SPL_TEXT_BASE - TEXT_BASE for linking the SPL binary. - - CONFIG_SPL_RELOC_TEXT_BASE - Address to relocate to. If unspecified, this is equal to - CONFIG_SPL_TEXT_BASE (i.e. no relocation is done). - - CONFIG_SPL_BSS_START_ADDR - Link address for the BSS within the SPL binary. - - CONFIG_SPL_BSS_MAX_SIZE - Maximum size in memory allocated to the SPL BSS. - When defined, the linker checks that the actual memory used - by SPL from __bss_start to __bss_end does not exceed it. - CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE - must not be both defined at the same time. - - CONFIG_SPL_STACK - Adress of the start of the stack SPL will use - - CONFIG_SPL_RELOC_STACK - Adress of the start of the stack SPL will use after - relocation. If unspecified, this is equal to - CONFIG_SPL_STACK. - - CONFIG_SYS_SPL_MALLOC_START - Starting address of the malloc pool used in SPL. - - CONFIG_SYS_SPL_MALLOC_SIZE - The size of the malloc pool used in SPL. - - CONFIG_SPL_FRAMEWORK - Enable the SPL framework under common/. This framework - supports MMC, NAND and YMODEM loading of U-Boot and NAND - NAND loading of the Linux Kernel. - - CONFIG_SPL_OS_BOOT - Enable booting directly to an OS from SPL. - See also: doc/README.falcon - - CONFIG_SPL_DISPLAY_PRINT - For ARM, enable an optional function to print more information - about the running system. - - CONFIG_SPL_INIT_MINIMAL - Arch init code should be built for a very small image - - CONFIG_SPL_LIBCOMMON_SUPPORT - Support for common/libcommon.o in SPL binary - - CONFIG_SPL_LIBDISK_SUPPORT - Support for disk/libdisk.o in SPL binary - - CONFIG_SPL_I2C_SUPPORT - Support for drivers/i2c/libi2c.o in SPL binary - - CONFIG_SPL_GPIO_SUPPORT - Support for drivers/gpio/libgpio.o in SPL binary - - CONFIG_SPL_MMC_SUPPORT - Support for drivers/mmc/libmmc.o in SPL binary - - CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR, - CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS, - CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION - Address, size and partition on the MMC to load U-Boot from - when the MMC is being used in raw mode. - - CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR - Sector to load kernel uImage from when MMC is being - used in raw mode (for Falcon mode) - - CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR, - CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS - Sector and number of sectors to load kernel argument - parameters from when MMC is being used in raw mode - (for falcon mode) - - CONFIG_SPL_FAT_SUPPORT - Support for fs/fat/libfat.o in SPL binary - - CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME - Filename to read to load U-Boot when reading from FAT - - CONFIG_SPL_FAT_LOAD_KERNEL_NAME - Filename to read to load kernel uImage when reading - from FAT (for Falcon mode) - - CONFIG_SPL_FAT_LOAD_ARGS_NAME - Filename to read to load kernel argument parameters - when reading from FAT (for Falcon mode) - - CONFIG_SPL_MPC83XX_WAIT_FOR_NAND - Set this for NAND SPL on PPC mpc83xx targets, so that - start.S waits for the rest of the SPL to load before - continuing (the hardware starts execution after just - loading the first page rather than the full 4K). - - CONFIG_SPL_SKIP_RELOCATE - Avoid SPL relocation - - CONFIG_SPL_NAND_BASE - Include nand_base.c in the SPL. Requires - CONFIG_SPL_NAND_DRIVERS. - - CONFIG_SPL_NAND_DRIVERS - SPL uses normal NAND drivers, not minimal drivers. - - CONFIG_SPL_NAND_ECC - Include standard software ECC in the SPL - - CONFIG_SPL_NAND_SIMPLE - Support for NAND boot using simple NAND drivers that - expose the cmd_ctrl() interface. - - CONFIG_SPL_MTD_SUPPORT - Support for the MTD subsystem within SPL. Useful for - environment on NAND support within SPL. - - CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT - Set for the SPL on PPC mpc8xxx targets, support for - drivers/ddr/fsl/libddr.o in SPL binary. - - CONFIG_SPL_COMMON_INIT_DDR - Set for common ddr init with serial presence detect in - SPL binary. - - CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT, - CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE, - CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS, - CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE, - CONFIG_SYS_NAND_ECCBYTES - Defines the size and behavior of the NAND that SPL uses - to read U-Boot - - CONFIG_SPL_NAND_BOOT - Add support NAND boot - - CONFIG_SYS_NAND_U_BOOT_OFFS - Location in NAND to read U-Boot from - - CONFIG_SYS_NAND_U_BOOT_DST - Location in memory to load U-Boot to - - CONFIG_SYS_NAND_U_BOOT_SIZE - Size of image to load - - CONFIG_SYS_NAND_U_BOOT_START - Entry point in loaded image to jump to - - CONFIG_SYS_NAND_HW_ECC_OOBFIRST - Define this if you need to first read the OOB and then the - data. This is used for example on davinci plattforms. - - CONFIG_SPL_OMAP3_ID_NAND - Support for an OMAP3-specific set of functions to return the - ID and MFR of the first attached NAND chip, if present. - - CONFIG_SPL_SERIAL_SUPPORT - Support for drivers/serial/libserial.o in SPL binary - - CONFIG_SPL_SPI_FLASH_SUPPORT - Support for drivers/mtd/spi/libspi_flash.o in SPL binary - - CONFIG_SPL_SPI_SUPPORT - Support for drivers/spi/libspi.o in SPL binary - - CONFIG_SPL_RAM_DEVICE - Support for running image already present in ram, in SPL binary - - CONFIG_SPL_LIBGENERIC_SUPPORT - Support for lib/libgeneric.o in SPL binary - - CONFIG_SPL_ENV_SUPPORT - Support for the environment operating in SPL binary - - CONFIG_SPL_NET_SUPPORT - Support for the net/libnet.o in SPL binary. - It conflicts with SPL env from storage medium specified by - CONFIG_ENV_IS_xxx but CONFIG_ENV_IS_NOWHERE - - CONFIG_SPL_PAD_TO - Image offset to which the SPL should be padded before appending - the SPL payload. By default, this is defined as - CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined. - CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL - payload without any padding, or >= CONFIG_SPL_MAX_SIZE. - - CONFIG_SPL_TARGET - Final target image containing SPL and payload. Some SPLs - use an arch-specific makefile fragment instead, for - example if more than one image needs to be produced. - - CONFIG_FIT_SPL_PRINT - Printing information about a FIT image adds quite a bit of - code to SPL. So this is normally disabled in SPL. Use this - option to re-enable it. This will affect the output of the - bootm command when booting a FIT image. - -- TPL framework - CONFIG_TPL - Enable building of TPL globally. - - CONFIG_TPL_PAD_TO - Image offset to which the TPL should be padded before appending - the TPL payload. By default, this is defined as - CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined. - CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL - payload without any padding, or >= CONFIG_SPL_MAX_SIZE. - -Modem Support: --------------- - -[so far only for SMDK2400 boards] - -- Modem support enable: - CONFIG_MODEM_SUPPORT - -- RTS/CTS Flow control enable: - CONFIG_HWFLOW - -- Modem debug support: - CONFIG_MODEM_SUPPORT_DEBUG - - Enables debugging stuff (char screen[1024], dbg()) - for modem support. Useful only with BDI2000. - -- Interrupt support (PPC): - - There are common interrupt_init() and timer_interrupt() - for all PPC archs. interrupt_init() calls interrupt_init_cpu() - for CPU specific initialization. interrupt_init_cpu() - should set decrementer_count to appropriate value. If - CPU resets decrementer automatically after interrupt - (ppc4xx) it should set decrementer_count to zero. - timer_interrupt() calls timer_interrupt_cpu() for CPU - specific handling. If board has watchdog / status_led - / other_activity_monitor it works automatically from - general timer_interrupt(). - -- General: - - In the target system modem support is enabled when a - specific key (key combination) is pressed during - power-on. Otherwise U-Boot will boot normally - (autoboot). The key_pressed() function is called from - board_init(). Currently key_pressed() is a dummy - function, returning 1 and thus enabling modem - initialization. - - If there are no modem init strings in the - environment, U-Boot proceed to autoboot; the - previous output (banner, info printfs) will be - suppressed, though. - - See also: doc/README.Modem - -Board initialization settings: ------------------------------- - -During Initialization u-boot calls a number of board specific functions -to allow the preparation of board specific prerequisites, e.g. pin setup -before drivers are initialized. To enable these callbacks the -following configuration macros have to be defined. Currently this is -architecture specific, so please check arch/your_architecture/lib/board.c -typically in board_init_f() and board_init_r(). - -- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f() -- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r() -- CONFIG_BOARD_LATE_INIT: Call board_late_init() -- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init() - -Configuration Settings: ------------------------ - -- CONFIG_SYS_SUPPORT_64BIT_DATA: Defined automatically if compiled as 64-bit. - Optionally it can be defined to support 64-bit memory commands. - -- CONFIG_SYS_LONGHELP: Defined when you want long help messages included; - undefine this when you're short of memory. - -- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default - width of the commands listed in the 'help' command output. - -- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to - prompt for user input. - -- CONFIG_SYS_CBSIZE: Buffer size for input from the Console - -- CONFIG_SYS_PBSIZE: Buffer size for Console output - -- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands - -- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to - the application (usually a Linux kernel) when it is - booted - -- CONFIG_SYS_BAUDRATE_TABLE: - List of legal baudrate settings for this board. - -- CONFIG_SYS_CONSOLE_INFO_QUIET - Suppress display of console information at boot. - -- CONFIG_SYS_CONSOLE_IS_IN_ENV - If the board specific function - extern int overwrite_console (void); - returns 1, the stdin, stderr and stdout are switched to the - serial port, else the settings in the environment are used. - -- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE - Enable the call to overwrite_console(). - -- CONFIG_SYS_CONSOLE_ENV_OVERWRITE - Enable overwrite of previous console environment settings. - -- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END: - Begin and End addresses of the area used by the - simple memory test. - -- CONFIG_SYS_ALT_MEMTEST: - Enable an alternate, more extensive memory test. - -- CONFIG_SYS_MEMTEST_SCRATCH: - Scratch address used by the alternate memory test - You only need to set this if address zero isn't writeable - -- CONFIG_SYS_MEM_TOP_HIDE (PPC only): - If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header, - this specified memory area will get subtracted from the top - (end) of RAM and won't get "touched" at all by U-Boot. By - fixing up gd->ram_size the Linux kernel should gets passed - the now "corrected" memory size and won't touch it either. - This should work for arch/ppc and arch/powerpc. Only Linux - board ports in arch/powerpc with bootwrapper support that - recalculate the memory size from the SDRAM controller setup - will have to get fixed in Linux additionally. - - This option can be used as a workaround for the 440EPx/GRx - CHIP 11 errata where the last 256 bytes in SDRAM shouldn't - be touched. - - WARNING: Please make sure that this value is a multiple of - the Linux page size (normally 4k). If this is not the case, - then the end address of the Linux memory will be located at a - non page size aligned address and this could cause major - problems. - -- CONFIG_SYS_LOADS_BAUD_CHANGE: - Enable temporary baudrate change while serial download - -- CONFIG_SYS_SDRAM_BASE: - Physical start address of SDRAM. _Must_ be 0 here. - -- CONFIG_SYS_MBIO_BASE: - Physical start address of Motherboard I/O (if using a - Cogent motherboard) - -- CONFIG_SYS_FLASH_BASE: - Physical start address of Flash memory. - -- CONFIG_SYS_MONITOR_BASE: - Physical start address of boot monitor code (set by - make config files to be same as the text base address - (CONFIG_SYS_TEXT_BASE) used when linking) - same as - CONFIG_SYS_FLASH_BASE when booting from flash. - -- CONFIG_SYS_MONITOR_LEN: - Size of memory reserved for monitor code, used to - determine _at_compile_time_ (!) if the environment is - embedded within the U-Boot image, or in a separate - flash sector. - -- CONFIG_SYS_MALLOC_LEN: - Size of DRAM reserved for malloc() use. - -- CONFIG_SYS_BOOTM_LEN: - Normally compressed uImages are limited to an - uncompressed size of 8 MBytes. If this is not enough, - you can define CONFIG_SYS_BOOTM_LEN in your board config file - to adjust this setting to your needs. - -- CONFIG_SYS_BOOTMAPSZ: - Maximum size of memory mapped by the startup code of - the Linux kernel; all data that must be processed by - the Linux kernel (bd_info, boot arguments, FDT blob if - used) must be put below this limit, unless "bootm_low" - environment variable is defined and non-zero. In such case - all data for the Linux kernel must be between "bootm_low" - and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment - variable "bootm_mapsize" will override the value of - CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined, - then the value in "bootm_size" will be used instead. - -- CONFIG_SYS_BOOT_RAMDISK_HIGH: - Enable initrd_high functionality. If defined then the - initrd_high feature is enabled and the bootm ramdisk subcommand - is enabled. - -- CONFIG_SYS_BOOT_GET_CMDLINE: - Enables allocating and saving kernel cmdline in space between - "bootm_low" and "bootm_low" + BOOTMAPSZ. - -- CONFIG_SYS_BOOT_GET_KBD: - Enables allocating and saving a kernel copy of the bd_info in - space between "bootm_low" and "bootm_low" + BOOTMAPSZ. - -- CONFIG_SYS_MAX_FLASH_BANKS: - Max number of Flash memory banks - -- CONFIG_SYS_MAX_FLASH_SECT: - Max number of sectors on a Flash chip - -- CONFIG_SYS_FLASH_ERASE_TOUT: - Timeout for Flash erase operations (in ms) - -- CONFIG_SYS_FLASH_WRITE_TOUT: - Timeout for Flash write operations (in ms) - -- CONFIG_SYS_FLASH_LOCK_TOUT - Timeout for Flash set sector lock bit operation (in ms) - -- CONFIG_SYS_FLASH_UNLOCK_TOUT - Timeout for Flash clear lock bits operation (in ms) - -- CONFIG_SYS_FLASH_PROTECTION - If defined, hardware flash sectors protection is used - instead of U-Boot software protection. - -- CONFIG_SYS_DIRECT_FLASH_TFTP: - - Enable TFTP transfers directly to flash memory; - without this option such a download has to be - performed in two steps: (1) download to RAM, and (2) - copy from RAM to flash. - - The two-step approach is usually more reliable, since - you can check if the download worked before you erase - the flash, but in some situations (when system RAM is - too limited to allow for a temporary copy of the - downloaded image) this option may be very useful. - -- CONFIG_SYS_FLASH_CFI: - Define if the flash driver uses extra elements in the - common flash structure for storing flash geometry. - -- CONFIG_FLASH_CFI_DRIVER - This option also enables the building of the cfi_flash driver - in the drivers directory - -- CONFIG_FLASH_CFI_MTD - This option enables the building of the cfi_mtd driver - in the drivers directory. The driver exports CFI flash - to the MTD layer. - -- CONFIG_SYS_FLASH_USE_BUFFER_WRITE - Use buffered writes to flash. - -- CONFIG_FLASH_SPANSION_S29WS_N - s29ws-n MirrorBit flash has non-standard addresses for buffered - write commands. - -- CONFIG_SYS_FLASH_QUIET_TEST - If this option is defined, the common CFI flash doesn't - print it's warning upon not recognized FLASH banks. This - is useful, if some of the configured banks are only - optionally available. - -- CONFIG_FLASH_SHOW_PROGRESS - If defined (must be an integer), print out countdown - digits and dots. Recommended value: 45 (9..1) for 80 - column displays, 15 (3..1) for 40 column displays. - -- CONFIG_FLASH_VERIFY - If defined, the content of the flash (destination) is compared - against the source after the write operation. An error message - will be printed when the contents are not identical. - Please note that this option is useless in nearly all cases, - since such flash programming errors usually are detected earlier - while unprotecting/erasing/programming. Please only enable - this option if you really know what you are doing. - -- CONFIG_SYS_RX_ETH_BUFFER: - Defines the number of Ethernet receive buffers. On some - Ethernet controllers it is recommended to set this value - to 8 or even higher (EEPRO100 or 405 EMAC), since all - buffers can be full shortly after enabling the interface - on high Ethernet traffic. - Defaults to 4 if not defined. - -- CONFIG_ENV_MAX_ENTRIES - - Maximum number of entries in the hash table that is used - internally to store the environment settings. The default - setting is supposed to be generous and should work in most - cases. This setting can be used to tune behaviour; see - lib/hashtable.c for details. - -- CONFIG_ENV_FLAGS_LIST_DEFAULT -- CONFIG_ENV_FLAGS_LIST_STATIC - Enable validation of the values given to environment variables when - calling env set. Variables can be restricted to only decimal, - hexadecimal, or boolean. If CONFIG_CMD_NET is also defined, - the variables can also be restricted to IP address or MAC address. - - The format of the list is: - type_attribute = [s|d|x|b|i|m] - access_atribute = [a|r|o|c] - attributes = type_attribute[access_atribute] - entry = variable_name[:attributes] - list = entry[,list] - - The type attributes are: - s - String (default) - d - Decimal - x - Hexadecimal - b - Boolean ([1yYtT|0nNfF]) - i - IP address - m - MAC address - - The access attributes are: - a - Any (default) - r - Read-only - o - Write-once - c - Change-default - - - CONFIG_ENV_FLAGS_LIST_DEFAULT - Define this to a list (string) to define the ".flags" - envirnoment variable in the default or embedded environment. - - - CONFIG_ENV_FLAGS_LIST_STATIC - Define this to a list (string) to define validation that - should be done if an entry is not found in the ".flags" - environment variable. To override a setting in the static - list, simply add an entry for the same variable name to the - ".flags" variable. - -- CONFIG_ENV_ACCESS_IGNORE_FORCE - If defined, don't allow the -f switch to env set override variable - access flags. - -- CONFIG_SYS_GENERIC_BOARD - This selects the architecture-generic board system instead of the - architecture-specific board files. It is intended to move boards - to this new framework over time. Defining this will disable the - arch/foo/lib/board.c file and use common/board_f.c and - common/board_r.c instead. To use this option your architecture - must support it (i.e. must define __HAVE_ARCH_GENERIC_BOARD in - its config.mk file). If you find problems enabling this option on - your board please report the problem and send patches! - -- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only) - This is set by OMAP boards for the max time that reset should - be asserted. See doc/README.omap-reset-time for details on how - the value can be calulated on a given board. - -The following definitions that deal with the placement and management -of environment data (variable area); in general, we support the -following configurations: - -- CONFIG_BUILD_ENVCRC: - - Builds up envcrc with the target environment so that external utils - may easily extract it and embed it in final U-Boot images. - -- CONFIG_ENV_IS_IN_FLASH: - - Define this if the environment is in flash memory. - - a) The environment occupies one whole flash sector, which is - "embedded" in the text segment with the U-Boot code. This - happens usually with "bottom boot sector" or "top boot - sector" type flash chips, which have several smaller - sectors at the start or the end. For instance, such a - layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In - such a case you would place the environment in one of the - 4 kB sectors - with U-Boot code before and after it. With - "top boot sector" type flash chips, you would put the - environment in one of the last sectors, leaving a gap - between U-Boot and the environment. - - - CONFIG_ENV_OFFSET: - - Offset of environment data (variable area) to the - beginning of flash memory; for instance, with bottom boot - type flash chips the second sector can be used: the offset - for this sector is given here. - - CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE. - - - CONFIG_ENV_ADDR: - - This is just another way to specify the start address of - the flash sector containing the environment (instead of - CONFIG_ENV_OFFSET). - - - CONFIG_ENV_SECT_SIZE: - - Size of the sector containing the environment. - - - b) Sometimes flash chips have few, equal sized, BIG sectors. - In such a case you don't want to spend a whole sector for - the environment. - - - CONFIG_ENV_SIZE: - - If you use this in combination with CONFIG_ENV_IS_IN_FLASH - and CONFIG_ENV_SECT_SIZE, you can specify to use only a part - of this flash sector for the environment. This saves - memory for the RAM copy of the environment. - - It may also save flash memory if you decide to use this - when your environment is "embedded" within U-Boot code, - since then the remainder of the flash sector could be used - for U-Boot code. It should be pointed out that this is - STRONGLY DISCOURAGED from a robustness point of view: - updating the environment in flash makes it always - necessary to erase the WHOLE sector. If something goes - wrong before the contents has been restored from a copy in - RAM, your target system will be dead. - - - CONFIG_ENV_ADDR_REDUND - CONFIG_ENV_SIZE_REDUND - - These settings describe a second storage area used to hold - a redundant copy of the environment data, so that there is - a valid backup copy in case there is a power failure during - a "saveenv" operation. - -BE CAREFUL! Any changes to the flash layout, and some changes to the -source code will make it necessary to adapt <board>/u-boot.lds* -accordingly! - - -- CONFIG_ENV_IS_IN_NVRAM: - - Define this if you have some non-volatile memory device - (NVRAM, battery buffered SRAM) which you want to use for the - environment. - - - CONFIG_ENV_ADDR: - - CONFIG_ENV_SIZE: - - These two #defines are used to determine the memory area you - want to use for environment. It is assumed that this memory - can just be read and written to, without any special - provision. - -BE CAREFUL! The first access to the environment happens quite early -in U-Boot initalization (when we try to get the setting of for the -console baudrate). You *MUST* have mapped your NVRAM area then, or -U-Boot will hang. - -Please note that even with NVRAM we still use a copy of the -environment in RAM: we could work on NVRAM directly, but we want to -keep settings there always unmodified except somebody uses "saveenv" -to save the current settings. - - -- CONFIG_ENV_IS_IN_EEPROM: - - Use this if you have an EEPROM or similar serial access - device and a driver for it. - - - CONFIG_ENV_OFFSET: - - CONFIG_ENV_SIZE: - - These two #defines specify the offset and size of the - environment area within the total memory of your EEPROM. - - - CONFIG_SYS_I2C_EEPROM_ADDR: - If defined, specified the chip address of the EEPROM device. - The default address is zero. - - - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS: - If defined, the number of bits used to address bytes in a - single page in the EEPROM device. A 64 byte page, for example - would require six bits. - - - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS: - If defined, the number of milliseconds to delay between - page writes. The default is zero milliseconds. - - - CONFIG_SYS_I2C_EEPROM_ADDR_LEN: - The length in bytes of the EEPROM memory array address. Note - that this is NOT the chip address length! - - - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW: - EEPROM chips that implement "address overflow" are ones - like Catalyst 24WC04/08/16 which has 9/10/11 bits of - address and the extra bits end up in the "chip address" bit - slots. This makes a 24WC08 (1Kbyte) chip look like four 256 - byte chips. - - Note that we consider the length of the address field to - still be one byte because the extra address bits are hidden - in the chip address. - - - CONFIG_SYS_EEPROM_SIZE: - The size in bytes of the EEPROM device. - - - CONFIG_ENV_EEPROM_IS_ON_I2C - define this, if you have I2C and SPI activated, and your - EEPROM, which holds the environment, is on the I2C bus. - - - CONFIG_I2C_ENV_EEPROM_BUS - if you have an Environment on an EEPROM reached over - I2C muxes, you can define here, how to reach this - EEPROM. For example: - - #define CONFIG_I2C_ENV_EEPROM_BUS 1 - - EEPROM which holds the environment, is reached over - a pca9547 i2c mux with address 0x70, channel 3. - -- CONFIG_ENV_IS_IN_DATAFLASH: - - Define this if you have a DataFlash memory device which you - want to use for the environment. - - - CONFIG_ENV_OFFSET: - - CONFIG_ENV_ADDR: - - CONFIG_ENV_SIZE: - - These three #defines specify the offset and size of the - environment area within the total memory of your DataFlash placed - at the specified address. - -- CONFIG_ENV_IS_IN_REMOTE: - - Define this if you have a remote memory space which you - want to use for the local device's environment. - - - CONFIG_ENV_ADDR: - - CONFIG_ENV_SIZE: - - These two #defines specify the address and size of the - environment area within the remote memory space. The - local device can get the environment from remote memory - space by SRIO or PCIE links. - -BE CAREFUL! For some special cases, the local device can not use -"saveenv" command. For example, the local device will get the -environment stored in a remote NOR flash by SRIO or PCIE link, -but it can not erase, write this NOR flash by SRIO or PCIE interface. - -- CONFIG_ENV_IS_IN_NAND: - - Define this if you have a NAND device which you want to use - for the environment. - - - CONFIG_ENV_OFFSET: - - CONFIG_ENV_SIZE: - - These two #defines specify the offset and size of the environment - area within the first NAND device. CONFIG_ENV_OFFSET must be - aligned to an erase block boundary. - - - CONFIG_ENV_OFFSET_REDUND (optional): - - This setting describes a second storage area of CONFIG_ENV_SIZE - size used to hold a redundant copy of the environment data, so - that there is a valid backup copy in case there is a power failure - during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be - aligned to an erase block boundary. - - - CONFIG_ENV_RANGE (optional): - - Specifies the length of the region in which the environment - can be written. This should be a multiple of the NAND device's - block size. Specifying a range with more erase blocks than - are needed to hold CONFIG_ENV_SIZE allows bad blocks within - the range to be avoided. - - - CONFIG_ENV_OFFSET_OOB (optional): - - Enables support for dynamically retrieving the offset of the - environment from block zero's out-of-band data. The - "nand env.oob" command can be used to record this offset. - Currently, CONFIG_ENV_OFFSET_REDUND is not supported when - using CONFIG_ENV_OFFSET_OOB. - -- CONFIG_NAND_ENV_DST - - Defines address in RAM to which the nand_spl code should copy the - environment. If redundant environment is used, it will be copied to - CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE. - -- CONFIG_ENV_IS_IN_UBI: - - Define this if you have an UBI volume that you want to use for the - environment. This has the benefit of wear-leveling the environment - accesses, which is important on NAND. - - - CONFIG_ENV_UBI_PART: - - Define this to a string that is the mtd partition containing the UBI. - - - CONFIG_ENV_UBI_VOLUME: - - Define this to the name of the volume that you want to store the - environment in. - - - CONFIG_ENV_UBI_VOLUME_REDUND: - - Define this to the name of another volume to store a second copy of - the environment in. This will enable redundant environments in UBI. - It is assumed that both volumes are in the same MTD partition. - - - CONFIG_UBI_SILENCE_MSG - - CONFIG_UBIFS_SILENCE_MSG - - You will probably want to define these to avoid a really noisy system - when storing the env in UBI. - -- CONFIG_ENV_IS_IN_MMC: - - Define this if you have an MMC device which you want to use for the - environment. - - - CONFIG_SYS_MMC_ENV_DEV: - - Specifies which MMC device the environment is stored in. - - - CONFIG_SYS_MMC_ENV_PART (optional): - - Specifies which MMC partition the environment is stored in. If not - set, defaults to partition 0, the user area. Common values might be - 1 (first MMC boot partition), 2 (second MMC boot partition). - - - CONFIG_ENV_OFFSET: - - CONFIG_ENV_SIZE: - - These two #defines specify the offset and size of the environment - area within the specified MMC device. - - If offset is positive (the usual case), it is treated as relative to - the start of the MMC partition. If offset is negative, it is treated - as relative to the end of the MMC partition. This can be useful if - your board may be fitted with different MMC devices, which have - different sizes for the MMC partitions, and you always want the - environment placed at the very end of the partition, to leave the - maximum possible space before it, to store other data. - - These two values are in units of bytes, but must be aligned to an - MMC sector boundary. - - - CONFIG_ENV_OFFSET_REDUND (optional): - - Specifies a second storage area, of CONFIG_ENV_SIZE size, used to - hold a redundant copy of the environment data. This provides a - valid backup copy in case the other copy is corrupted, e.g. due - to a power failure during a "saveenv" operation. - - This value may also be positive or negative; this is handled in the - same way as CONFIG_ENV_OFFSET. - - This value is also in units of bytes, but must also be aligned to - an MMC sector boundary. - - - CONFIG_ENV_SIZE_REDUND (optional): - - This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is - set. If this value is set, it must be set to the same value as - CONFIG_ENV_SIZE. - -- CONFIG_SYS_SPI_INIT_OFFSET - - Defines offset to the initial SPI buffer area in DPRAM. The - area is used at an early stage (ROM part) if the environment - is configured to reside in the SPI EEPROM: We need a 520 byte - scratch DPRAM area. It is used between the two initialization - calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems - to be a good choice since it makes it far enough from the - start of the data area as well as from the stack pointer. - -Please note that the environment is read-only until the monitor -has been relocated to RAM and a RAM copy of the environment has been -created; also, when using EEPROM you will have to use getenv_f() -until then to read environment variables. - -The environment is protected by a CRC32 checksum. Before the monitor -is relocated into RAM, as a result of a bad CRC you will be working -with the compiled-in default environment - *silently*!!! [This is -necessary, because the first environment variable we need is the -"baudrate" setting for the console - if we have a bad CRC, we don't -have any device yet where we could complain.] - -Note: once the monitor has been relocated, then it will complain if -the default environment is used; a new CRC is computed as soon as you -use the "saveenv" command to store a valid environment. - -- CONFIG_SYS_FAULT_ECHO_LINK_DOWN: - Echo the inverted Ethernet link state to the fault LED. - - Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR - also needs to be defined. - -- CONFIG_SYS_FAULT_MII_ADDR: - MII address of the PHY to check for the Ethernet link state. - -- CONFIG_NS16550_MIN_FUNCTIONS: - Define this if you desire to only have use of the NS16550_init - and NS16550_putc functions for the serial driver located at - drivers/serial/ns16550.c. This option is useful for saving - space for already greatly restricted images, including but not - limited to NAND_SPL configurations. - -- CONFIG_DISPLAY_BOARDINFO - Display information about the board that U-Boot is running on - when U-Boot starts up. The board function checkboard() is called - to do this. - -- CONFIG_DISPLAY_BOARDINFO_LATE - Similar to the previous option, but display this information - later, once stdio is running and output goes to the LCD, if - present. - -Low Level (hardware related) configuration options: ---------------------------------------------------- - -- CONFIG_SYS_CACHELINE_SIZE: - Cache Line Size of the CPU. - -- CONFIG_SYS_DEFAULT_IMMR: - Default address of the IMMR after system reset. - - Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU, - and RPXsuper) to be able to adjust the position of - the IMMR register after a reset. - -- CONFIG_SYS_CCSRBAR_DEFAULT: - Default (power-on reset) physical address of CCSR on Freescale - PowerPC SOCs. - -- CONFIG_SYS_CCSRBAR: - Virtual address of CCSR. On a 32-bit build, this is typically - the same value as CONFIG_SYS_CCSRBAR_DEFAULT. - - CONFIG_SYS_DEFAULT_IMMR must also be set to this value, - for cross-platform code that uses that macro instead. - -- CONFIG_SYS_CCSRBAR_PHYS: - Physical address of CCSR. CCSR can be relocated to a new - physical address, if desired. In this case, this macro should - be set to that address. Otherwise, it should be set to the - same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR - is typically relocated on 36-bit builds. It is recommended - that this macro be defined via the _HIGH and _LOW macros: - - #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH - * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW) - -- CONFIG_SYS_CCSRBAR_PHYS_HIGH: - Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically - either 0 (32-bit build) or 0xF (36-bit build). This macro is - used in assembly code, so it must not contain typecasts or - integer size suffixes (e.g. "ULL"). - -- CONFIG_SYS_CCSRBAR_PHYS_LOW: - Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is - used in assembly code, so it must not contain typecasts or - integer size suffixes (e.g. "ULL"). - -- CONFIG_SYS_CCSR_DO_NOT_RELOCATE: - If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be - forced to a value that ensures that CCSR is not relocated. - -- Floppy Disk Support: - CONFIG_SYS_FDC_DRIVE_NUMBER - - the default drive number (default value 0) - - CONFIG_SYS_ISA_IO_STRIDE - - defines the spacing between FDC chipset registers - (default value 1) - - CONFIG_SYS_ISA_IO_OFFSET - - defines the offset of register from address. It - depends on which part of the data bus is connected to - the FDC chipset. (default value 0) - - If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and - CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their - default value. - - if CONFIG_SYS_FDC_HW_INIT is defined, then the function - fdc_hw_init() is called at the beginning of the FDC - setup. fdc_hw_init() must be provided by the board - source code. It is used to make hardware dependant - initializations. - -- CONFIG_IDE_AHB: - Most IDE controllers were designed to be connected with PCI - interface. Only few of them were designed for AHB interface. - When software is doing ATA command and data transfer to - IDE devices through IDE-AHB controller, some additional - registers accessing to these kind of IDE-AHB controller - is requierd. - -- CONFIG_SYS_IMMR: Physical address of the Internal Memory. - DO NOT CHANGE unless you know exactly what you're - doing! (11-4) [MPC8xx/82xx systems only] - -- CONFIG_SYS_INIT_RAM_ADDR: - - Start address of memory area that can be used for - initial data and stack; please note that this must be - writable memory that is working WITHOUT special - initialization, i. e. you CANNOT use normal RAM which - will become available only after programming the - memory controller and running certain initialization - sequences. - - U-Boot uses the following memory types: - - MPC8xx and MPC8260: IMMR (internal memory of the CPU) - - MPC824X: data cache - - PPC4xx: data cache - -- CONFIG_SYS_GBL_DATA_OFFSET: - - Offset of the initial data structure in the memory - area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually - CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial - data is located at the end of the available space - (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE - - CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just - below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR + - CONFIG_SYS_GBL_DATA_OFFSET) downward. - - Note: - On the MPC824X (or other systems that use the data - cache for initial memory) the address chosen for - CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must - point to an otherwise UNUSED address space between - the top of RAM and the start of the PCI space. - -- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6) - -- CONFIG_SYS_SYPCR: System Protection Control (11-9) - -- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26) - -- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31) - -- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30) - -- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27) - -- CONFIG_SYS_OR_TIMING_SDRAM: - SDRAM timing - -- CONFIG_SYS_MAMR_PTA: - periodic timer for refresh - -- CONFIG_SYS_DER: Debug Event Register (37-47) - -- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM, - CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP, - CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM, - CONFIG_SYS_BR1_PRELIM: - Memory Controller Definitions: BR0/1 and OR0/1 (FLASH) - -- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE, - CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM, - CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM: - Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM) - -- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K, - CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL: - Machine Mode Register and Memory Periodic Timer - Prescaler definitions (SDRAM timing) - -- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]: - enable I2C microcode relocation patch (MPC8xx); - define relocation offset in DPRAM [DSP2] - -- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]: - enable SMC microcode relocation patch (MPC8xx); - define relocation offset in DPRAM [SMC1] - -- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]: - enable SPI microcode relocation patch (MPC8xx); - define relocation offset in DPRAM [SCC4] - -- CONFIG_SYS_USE_OSCCLK: - Use OSCM clock mode on MBX8xx board. Be careful, - wrong setting might damage your board. Read - doc/README.MBX before setting this variable! - -- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only) - Offset of the bootmode word in DPRAM used by post - (Power On Self Tests). This definition overrides - #define'd default value in commproc.h resp. - cpm_8260.h. - -- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB, - CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL, - CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS, - CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB, - CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START, - CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL, - CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE, - CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only) - Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set. - -- CONFIG_PCI_DISABLE_PCIE: - Disable PCI-Express on systems where it is supported but not - required. - -- CONFIG_PCI_ENUM_ONLY - Only scan through and get the devices on the busses. - Don't do any setup work, presumably because someone or - something has already done it, and we don't need to do it - a second time. Useful for platforms that are pre-booted - by coreboot or similar. - -- CONFIG_PCI_INDIRECT_BRIDGE: - Enable support for indirect PCI bridges. - -- CONFIG_SYS_SRIO: - Chip has SRIO or not - -- CONFIG_SRIO1: - Board has SRIO 1 port available - -- CONFIG_SRIO2: - Board has SRIO 2 port available - -- CONFIG_SRIO_PCIE_BOOT_MASTER - Board can support master function for Boot from SRIO and PCIE - -- CONFIG_SYS_SRIOn_MEM_VIRT: - Virtual Address of SRIO port 'n' memory region - -- CONFIG_SYS_SRIOn_MEM_PHYS: - Physical Address of SRIO port 'n' memory region - -- CONFIG_SYS_SRIOn_MEM_SIZE: - Size of SRIO port 'n' memory region - -- CONFIG_SYS_NAND_BUSWIDTH_16BIT - Defined to tell the NAND controller that the NAND chip is using - a 16 bit bus. - Not all NAND drivers use this symbol. - Example of drivers that use it: - - drivers/mtd/nand/ndfc.c - - drivers/mtd/nand/mxc_nand.c - -- CONFIG_SYS_NDFC_EBC0_CFG - Sets the EBC0_CFG register for the NDFC. If not defined - a default value will be used. - -- CONFIG_SPD_EEPROM - Get DDR timing information from an I2C EEPROM. Common - with pluggable memory modules such as SODIMMs - - SPD_EEPROM_ADDRESS - I2C address of the SPD EEPROM - -- CONFIG_SYS_SPD_BUS_NUM - If SPD EEPROM is on an I2C bus other than the first - one, specify here. Note that the value must resolve - to something your driver can deal with. - -- CONFIG_SYS_DDR_RAW_TIMING - Get DDR timing information from other than SPD. Common with - soldered DDR chips onboard without SPD. DDR raw timing - parameters are extracted from datasheet and hard-coded into - header files or board specific files. - -- CONFIG_FSL_DDR_INTERACTIVE - Enable interactive DDR debugging. See doc/README.fsl-ddr. - -- CONFIG_SYS_83XX_DDR_USES_CS0 - Only for 83xx systems. If specified, then DDR should - be configured using CS0 and CS1 instead of CS2 and CS3. - -- CONFIG_ETHER_ON_FEC[12] - Define to enable FEC[12] on a 8xx series processor. - -- CONFIG_FEC[12]_PHY - Define to the hardcoded PHY address which corresponds - to the given FEC; i. e. - #define CONFIG_FEC1_PHY 4 - means that the PHY with address 4 is connected to FEC1 - - When set to -1, means to probe for first available. - -- CONFIG_FEC[12]_PHY_NORXERR - The PHY does not have a RXERR line (RMII only). - (so program the FEC to ignore it). - -- CONFIG_RMII - Enable RMII mode for all FECs. - Note that this is a global option, we can't - have one FEC in standard MII mode and another in RMII mode. - -- CONFIG_CRC32_VERIFY - Add a verify option to the crc32 command. - The syntax is: - - => crc32 -v <address> <count> <crc32> - - Where address/count indicate a memory area - and crc32 is the correct crc32 which the - area should have. - -- CONFIG_LOOPW - Add the "loopw" memory command. This only takes effect if - the memory commands are activated globally (CONFIG_CMD_MEM). - -- CONFIG_MX_CYCLIC - Add the "mdc" and "mwc" memory commands. These are cyclic - "md/mw" commands. - Examples: - - => mdc.b 10 4 500 - This command will print 4 bytes (10,11,12,13) each 500 ms. - - => mwc.l 100 12345678 10 - This command will write 12345678 to address 100 all 10 ms. - - This only takes effect if the memory commands are activated - globally (CONFIG_CMD_MEM). - -- CONFIG_SKIP_LOWLEVEL_INIT - [ARM, NDS32, MIPS only] If this variable is defined, then certain - low level initializations (like setting up the memory - controller) are omitted and/or U-Boot does not - relocate itself into RAM. - - Normally this variable MUST NOT be defined. The only - exception is when U-Boot is loaded (to RAM) by some - other boot loader or by a debugger which performs - these initializations itself. - -- CONFIG_SPL_BUILD - Modifies the behaviour of start.S when compiling a loader - that is executed before the actual U-Boot. E.g. when - compiling a NAND SPL. - -- CONFIG_TPL_BUILD - Modifies the behaviour of start.S when compiling a loader - that is executed after the SPL and before the actual U-Boot. - It is loaded by the SPL. - -- CONFIG_SYS_MPC85XX_NO_RESETVEC - Only for 85xx systems. If this variable is specified, the section - .resetvec is not kept and the section .bootpg is placed in the - previous 4k of the .text section. - -- CONFIG_ARCH_MAP_SYSMEM - Generally U-Boot (and in particular the md command) uses - effective address. It is therefore not necessary to regard - U-Boot address as virtual addresses that need to be translated - to physical addresses. However, sandbox requires this, since - it maintains its own little RAM buffer which contains all - addressable memory. This option causes some memory accesses - to be mapped through map_sysmem() / unmap_sysmem(). - -- CONFIG_USE_ARCH_MEMCPY - CONFIG_USE_ARCH_MEMSET - If these options are used a optimized version of memcpy/memset will - be used if available. These functions may be faster under some - conditions but may increase the binary size. - -- CONFIG_X86_RESET_VECTOR - If defined, the x86 reset vector code is included. This is not - needed when U-Boot is running from Coreboot. - -- CONFIG_SYS_MPUCLK - Defines the MPU clock speed (in MHz). - - NOTE : currently only supported on AM335x platforms. - -- CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC: - Enables the RTC32K OSC on AM33xx based plattforms - -- CONFIG_SYS_NAND_NO_SUBPAGE_WRITE - Option to disable subpage write in NAND driver - driver that uses this: - drivers/mtd/nand/davinci_nand.c - -Freescale QE/FMAN Firmware Support: ------------------------------------ - -The Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the -loading of "firmware", which is encoded in the QE firmware binary format. -This firmware often needs to be loaded during U-Boot booting, so macros -are used to identify the storage device (NOR flash, SPI, etc) and the address -within that device. - -- CONFIG_SYS_FMAN_FW_ADDR - The address in the storage device where the FMAN microcode is located. The - meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro - is also specified. - -- CONFIG_SYS_QE_FW_ADDR - The address in the storage device where the QE microcode is located. The - meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro - is also specified. - -- CONFIG_SYS_QE_FMAN_FW_LENGTH - The maximum possible size of the firmware. The firmware binary format - has a field that specifies the actual size of the firmware, but it - might not be possible to read any part of the firmware unless some - local storage is allocated to hold the entire firmware first. - -- CONFIG_SYS_QE_FMAN_FW_IN_NOR - Specifies that QE/FMAN firmware is located in NOR flash, mapped as - normal addressable memory via the LBC. CONFIG_SYS_FMAN_FW_ADDR is the - virtual address in NOR flash. - -- CONFIG_SYS_QE_FMAN_FW_IN_NAND - Specifies that QE/FMAN firmware is located in NAND flash. - CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash. - -- CONFIG_SYS_QE_FMAN_FW_IN_MMC - Specifies that QE/FMAN firmware is located on the primary SD/MMC - device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device. - -- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH - Specifies that QE/FMAN firmware is located on the primary SPI - device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device. - -- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE - Specifies that QE/FMAN firmware is located in the remote (master) - memory space. CONFIG_SYS_FMAN_FW_ADDR is a virtual address which - can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound - window->master inbound window->master LAW->the ucode address in - master's memory space. - -Building the Software: -====================== - -Building U-Boot has been tested in several native build environments -and in many different cross environments. Of course we cannot support -all possibly existing versions of cross development tools in all -(potentially obsolete) versions. In case of tool chain problems we -recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK) -which is extensively used to build and test U-Boot. - -If you are not using a native environment, it is assumed that you -have GNU cross compiling tools available in your path. In this case, -you must set the environment variable CROSS_COMPILE in your shell. -Note that no changes to the Makefile or any other source files are -necessary. For example using the ELDK on a 4xx CPU, please enter: - - $ CROSS_COMPILE=ppc_4xx- - $ export CROSS_COMPILE - -Note: If you wish to generate Windows versions of the utilities in - the tools directory you can use the MinGW toolchain - (http://www.mingw.org). Set your HOST tools to the MinGW - toolchain and execute 'make tools'. For example: - - $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools - - Binaries such as tools/mkimage.exe will be created which can - be executed on computers running Windows. - -U-Boot is intended to be simple to build. After installing the -sources you must configure U-Boot for one specific board type. This -is done by typing: - - make NAME_config - -where "NAME_config" is the name of one of the existing configu- -rations; see boards.cfg for supported names. - -Note: for some board special configuration names may exist; check if - additional information is available from the board vendor; for - instance, the TQM823L systems are available without (standard) - or with LCD support. You can select such additional "features" - when choosing the configuration, i. e. - - make TQM823L_config - - will configure for a plain TQM823L, i. e. no LCD support - - make TQM823L_LCD_config - - will configure for a TQM823L with U-Boot console on LCD - - etc. - - -Finally, type "make all", and you should get some working U-Boot -images ready for download to / installation on your system: - -- "u-boot.bin" is a raw binary image -- "u-boot" is an image in ELF binary format -- "u-boot.srec" is in Motorola S-Record format - -By default the build is performed locally and the objects are saved -in the source directory. One of the two methods can be used to change -this behavior and build U-Boot to some external directory: - -1. Add O= to the make command line invocations: - - make O=/tmp/build distclean - make O=/tmp/build NAME_config - make O=/tmp/build all - -2. Set environment variable BUILD_DIR to point to the desired location: - - export BUILD_DIR=/tmp/build - make distclean - make NAME_config - make all - -Note that the command line "O=" setting overrides the BUILD_DIR environment -variable. - - -Please be aware that the Makefiles assume you are using GNU make, so -for instance on NetBSD you might need to use "gmake" instead of -native "make". - - -If the system board that you have is not listed, then you will need -to port U-Boot to your hardware platform. To do this, follow these -steps: - -1. Add a new configuration option for your board to the toplevel - "boards.cfg" file, using the existing entries as examples. - Follow the instructions there to keep the boards in order. -2. Create a new directory to hold your board specific code. Add any - files you need. In your board directory, you will need at least - the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds". -3. Create a new configuration file "include/configs/<board>.h" for - your board -3. If you're porting U-Boot to a new CPU, then also create a new - directory to hold your CPU specific code. Add any files you need. -4. Run "make <board>_config" with your new name. -5. Type "make", and you should get a working "u-boot.srec" file - to be installed on your target system. -6. Debug and solve any problems that might arise. - [Of course, this last step is much harder than it sounds.] - - -Testing of U-Boot Modifications, Ports to New Hardware, etc.: -============================================================== - -If you have modified U-Boot sources (for instance added a new board -or support for new devices, a new CPU, etc.) you are expected to -provide feedback to the other developers. The feedback normally takes -the form of a "patch", i. e. a context diff against a certain (latest -official or latest in the git repository) version of U-Boot sources. - -But before you submit such a patch, please verify that your modifi- -cation did not break existing code. At least make sure that *ALL* of -the supported boards compile WITHOUT ANY compiler warnings. To do so, -just run the "MAKEALL" script, which will configure and build U-Boot -for ALL supported system. Be warned, this will take a while. You can -select which (cross) compiler to use by passing a `CROSS_COMPILE' -environment variable to the script, i. e. to use the ELDK cross tools -you can type - - CROSS_COMPILE=ppc_8xx- MAKEALL - -or to build on a native PowerPC system you can type - - CROSS_COMPILE=' ' MAKEALL - -When using the MAKEALL script, the default behaviour is to build -U-Boot in the source directory. This location can be changed by -setting the BUILD_DIR environment variable. Also, for each target -built, the MAKEALL script saves two log files (<target>.ERR and -<target>.MAKEALL) in the <source dir>/LOG directory. This default -location can be changed by setting the MAKEALL_LOGDIR environment -variable. For example: - - export BUILD_DIR=/tmp/build - export MAKEALL_LOGDIR=/tmp/log - CROSS_COMPILE=ppc_8xx- MAKEALL - -With the above settings build objects are saved in the /tmp/build, -log files are saved in the /tmp/log and the source tree remains clean -during the whole build process. - - -See also "U-Boot Porting Guide" below. - - -Monitor Commands - Overview: -============================ - -go - start application at address 'addr' -run - run commands in an environment variable -bootm - boot application image from memory -bootp - boot image via network using BootP/TFTP protocol -bootz - boot zImage from memory -tftpboot- boot image via network using TFTP protocol - and env variables "ipaddr" and "serverip" - (and eventually "gatewayip") -tftpput - upload a file via network using TFTP protocol -rarpboot- boot image via network using RARP/TFTP protocol -diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' -loads - load S-Record file over serial line -loadb - load binary file over serial line (kermit mode) -md - memory display -mm - memory modify (auto-incrementing) -nm - memory modify (constant address) -mw - memory write (fill) -cp - memory copy -cmp - memory compare -crc32 - checksum calculation -i2c - I2C sub-system -sspi - SPI utility commands -base - print or set address offset -printenv- print environment variables -setenv - set environment variables -saveenv - save environment variables to persistent storage -protect - enable or disable FLASH write protection -erase - erase FLASH memory -flinfo - print FLASH memory information -nand - NAND memory operations (see doc/README.nand) -bdinfo - print Board Info structure -iminfo - print header information for application image -coninfo - print console devices and informations -ide - IDE sub-system -loop - infinite loop on address range -loopw - infinite write loop on address range -mtest - simple RAM test -icache - enable or disable instruction cache -dcache - enable or disable data cache -reset - Perform RESET of the CPU -echo - echo args to console -version - print monitor version -help - print online help -? - alias for 'help' - - -Monitor Commands - Detailed Description: -======================================== - -TODO. - -For now: just type "help <command>". - - -Environment Variables: -====================== - -U-Boot supports user configuration using Environment Variables which -can be made persistent by saving to Flash memory. - -Environment Variables are set using "setenv", printed using -"printenv", and saved to Flash using "saveenv". Using "setenv" -without a value can be used to delete a variable from the -environment. As long as you don't save the environment you are -working with an in-memory copy. In case the Flash area containing the -environment is erased by accident, a default environment is provided. - -Some configuration options can be set using Environment Variables. - -List of environment variables (most likely not complete): - - baudrate - see CONFIG_BAUDRATE - - bootdelay - see CONFIG_BOOTDELAY - - bootcmd - see CONFIG_BOOTCOMMAND - - bootargs - Boot arguments when booting an RTOS image - - bootfile - Name of the image to load with TFTP - - bootm_low - Memory range available for image processing in the bootm - command can be restricted. This variable is given as - a hexadecimal number and defines lowest address allowed - for use by the bootm command. See also "bootm_size" - environment variable. Address defined by "bootm_low" is - also the base of the initial memory mapping for the Linux - kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and - bootm_mapsize. - - bootm_mapsize - Size of the initial memory mapping for the Linux kernel. - This variable is given as a hexadecimal number and it - defines the size of the memory region starting at base - address bootm_low that is accessible by the Linux kernel - during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used - as the default value if it is defined, and bootm_size is - used otherwise. - - bootm_size - Memory range available for image processing in the bootm - command can be restricted. This variable is given as - a hexadecimal number and defines the size of the region - allowed for use by the bootm command. See also "bootm_low" - environment variable. - - updatefile - Location of the software update file on a TFTP server, used - by the automatic software update feature. Please refer to - documentation in doc/README.update for more details. - - autoload - if set to "no" (any string beginning with 'n'), - "bootp" will just load perform a lookup of the - configuration from the BOOTP server, but not try to - load any image using TFTP - - autostart - if set to "yes", an image loaded using the "bootp", - "rarpboot", "tftpboot" or "diskboot" commands will - be automatically started (by internally calling - "bootm") - - If set to "no", a standalone image passed to the - "bootm" command will be copied to the load address - (and eventually uncompressed), but NOT be started. - This can be used to load and uncompress arbitrary - data. - - fdt_high - if set this restricts the maximum address that the - flattened device tree will be copied into upon boot. - For example, if you have a system with 1 GB memory - at physical address 0x10000000, while Linux kernel - only recognizes the first 704 MB as low memory, you - may need to set fdt_high as 0x3C000000 to have the - device tree blob be copied to the maximum address - of the 704 MB low memory, so that Linux kernel can - access it during the boot procedure. - - If this is set to the special value 0xFFFFFFFF then - the fdt will not be copied at all on boot. For this - to work it must reside in writable memory, have - sufficient padding on the end of it for u-boot to - add the information it needs into it, and the memory - must be accessible by the kernel. - - fdtcontroladdr- if set this is the address of the control flattened - device tree used by U-Boot when CONFIG_OF_CONTROL is - defined. - - i2cfast - (PPC405GP|PPC405EP only) - if set to 'y' configures Linux I2C driver for fast - mode (400kHZ). This environment variable is used in - initialization code. So, for changes to be effective - it must be saved and board must be reset. - - initrd_high - restrict positioning of initrd images: - If this variable is not set, initrd images will be - copied to the highest possible address in RAM; this - is usually what you want since it allows for - maximum initrd size. If for some reason you want to - make sure that the initrd image is loaded below the - CONFIG_SYS_BOOTMAPSZ limit, you can set this environment - variable to a value of "no" or "off" or "0". - Alternatively, you can set it to a maximum upper - address to use (U-Boot will still check that it - does not overwrite the U-Boot stack and data). - - For instance, when you have a system with 16 MB - RAM, and want to reserve 4 MB from use by Linux, - you can do this by adding "mem=12M" to the value of - the "bootargs" variable. However, now you must make - sure that the initrd image is placed in the first - 12 MB as well - this can be done with - - setenv initrd_high 00c00000 - - If you set initrd_high to 0xFFFFFFFF, this is an - indication to U-Boot that all addresses are legal - for the Linux kernel, including addresses in flash - memory. In this case U-Boot will NOT COPY the - ramdisk at all. This may be useful to reduce the - boot time on your system, but requires that this - feature is supported by your Linux kernel. - - ipaddr - IP address; needed for tftpboot command - - loadaddr - Default load address for commands like "bootp", - "rarpboot", "tftpboot", "loadb" or "diskboot" - - loads_echo - see CONFIG_LOADS_ECHO - - serverip - TFTP server IP address; needed for tftpboot command - - bootretry - see CONFIG_BOOT_RETRY_TIME - - bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR - - bootstopkey - see CONFIG_AUTOBOOT_STOP_STR - - ethprime - controls which interface is used first. - - ethact - controls which interface is currently active. - For example you can do the following - - => setenv ethact FEC - => ping 192.168.0.1 # traffic sent on FEC - => setenv ethact SCC - => ping 10.0.0.1 # traffic sent on SCC - - ethrotate - When set to "no" U-Boot does not go through all - available network interfaces. - It just stays at the currently selected interface. - - netretry - When set to "no" each network operation will - either succeed or fail without retrying. - When set to "once" the network operation will - fail when all the available network interfaces - are tried once without success. - Useful on scripts which control the retry operation - themselves. - - npe_ucode - set load address for the NPE microcode - - silent_linux - If set then linux will be told to boot silently, by - changing the console to be empty. If "yes" it will be - made silent. If "no" it will not be made silent. If - unset, then it will be made silent if the U-Boot console - is silent. - - tftpsrcport - If this is set, the value is used for TFTP's - UDP source port. - - tftpdstport - If this is set, the value is used for TFTP's UDP - destination port instead of the Well Know Port 69. - - tftpblocksize - Block size to use for TFTP transfers; if not set, - we use the TFTP server's default block size - - tftptimeout - Retransmission timeout for TFTP packets (in milli- - seconds, minimum value is 1000 = 1 second). Defines - when a packet is considered to be lost so it has to - be retransmitted. The default is 5000 = 5 seconds. - Lowering this value may make downloads succeed - faster in networks with high packet loss rates or - with unreliable TFTP servers. - - vlan - When set to a value < 4095 the traffic over - Ethernet is encapsulated/received over 802.1q - VLAN tagged frames. - -The following image location variables contain the location of images -used in booting. The "Image" column gives the role of the image and is -not an environment variable name. The other columns are environment -variable names. "File Name" gives the name of the file on a TFTP -server, "RAM Address" gives the location in RAM the image will be -loaded to, and "Flash Location" gives the image's address in NOR -flash or offset in NAND flash. - -*Note* - these variables don't have to be defined for all boards, some -boards currenlty use other variables for these purposes, and some -boards use these variables for other purposes. - -Image File Name RAM Address Flash Location ------ --------- ----------- -------------- -u-boot u-boot u-boot_addr_r u-boot_addr -Linux kernel bootfile kernel_addr_r kernel_addr -device tree blob fdtfile fdt_addr_r fdt_addr -ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr - -The following environment variables may be used and automatically -updated by the network boot commands ("bootp" and "rarpboot"), -depending the information provided by your boot server: - - bootfile - see above - dnsip - IP address of your Domain Name Server - dnsip2 - IP address of your secondary Domain Name Server - gatewayip - IP address of the Gateway (Router) to use - hostname - Target hostname - ipaddr - see above - netmask - Subnet Mask - rootpath - Pathname of the root filesystem on the NFS server - serverip - see above - - -There are two special Environment Variables: - - serial# - contains hardware identification information such - as type string and/or serial number - ethaddr - Ethernet address - -These variables can be set only once (usually during manufacturing of -the board). U-Boot refuses to delete or overwrite these variables -once they have been set once. - - -Further special Environment Variables: - - ver - Contains the U-Boot version string as printed - with the "version" command. This variable is - readonly (see CONFIG_VERSION_VARIABLE). - - -Please note that changes to some configuration parameters may take -only effect after the next boot (yes, that's just like Windoze :-). - - -Callback functions for environment variables: ---------------------------------------------- - -For some environment variables, the behavior of u-boot needs to change -when their values are changed. This functionailty allows functions to -be associated with arbitrary variables. On creation, overwrite, or -deletion, the callback will provide the opportunity for some side -effect to happen or for the change to be rejected. - -The callbacks are named and associated with a function using the -U_BOOT_ENV_CALLBACK macro in your board or driver code. - -These callbacks are associated with variables in one of two ways. The -static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC -in the board configuration to a string that defines a list of -associations. The list must be in the following format: - - entry = variable_name[:callback_name] - list = entry[,list] - -If the callback name is not specified, then the callback is deleted. -Spaces are also allowed anywhere in the list. - -Callbacks can also be associated by defining the ".callbacks" variable -with the same list format above. Any association in ".callbacks" will -override any association in the static list. You can define -CONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the -".callbacks" envirnoment variable in the default or embedded environment. - - -Command Line Parsing: -===================== - -There are two different command line parsers available with U-Boot: -the old "simple" one, and the much more powerful "hush" shell: - -Old, simple command line parser: --------------------------------- - -- supports environment variables (through setenv / saveenv commands) -- several commands on one line, separated by ';' -- variable substitution using "... ${name} ..." syntax -- special characters ('$', ';') can be escaped by prefixing with '\', - for example: - setenv bootcmd bootm \${address} -- You can also escape text by enclosing in single apostrophes, for example: - setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off' - -Hush shell: ------------ - -- similar to Bourne shell, with control structures like - if...then...else...fi, for...do...done; while...do...done, - until...do...done, ... -- supports environment ("global") variables (through setenv / saveenv - commands) and local shell variables (through standard shell syntax - "name=value"); only environment variables can be used with "run" - command - -General rules: --------------- - -(1) If a command line (or an environment variable executed by a "run" - command) contains several commands separated by semicolon, and - one of these commands fails, then the remaining commands will be - executed anyway. - -(2) If you execute several variables with one call to run (i. e. - calling run with a list of variables as arguments), any failing - command will cause "run" to terminate, i. e. the remaining - variables are not executed. - -Note for Redundant Ethernet Interfaces: -======================================= - -Some boards come with redundant Ethernet interfaces; U-Boot supports -such configurations and is capable of automatic selection of a -"working" interface when needed. MAC assignment works as follows: - -Network interfaces are numbered eth0, eth1, eth2, ... Corresponding -MAC addresses can be stored in the environment as "ethaddr" (=>eth0), -"eth1addr" (=>eth1), "eth2addr", ... - -If the network interface stores some valid MAC address (for instance -in SROM), this is used as default address if there is NO correspon- -ding setting in the environment; if the corresponding environment -variable is set, this overrides the settings in the card; that means: - -o If the SROM has a valid MAC address, and there is no address in the - environment, the SROM's address is used. - -o If there is no valid address in the SROM, and a definition in the - environment exists, then the value from the environment variable is - used. - -o If both the SROM and the environment contain a MAC address, and - both addresses are the same, this MAC address is used. - -o If both the SROM and the environment contain a MAC address, and the - addresses differ, the value from the environment is used and a - warning is printed. - -o If neither SROM nor the environment contain a MAC address, an error - is raised. - -If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses -will be programmed into hardware as part of the initialization process. This -may be skipped by setting the appropriate 'ethmacskip' environment variable. -The naming convention is as follows: -"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc. - -Image Formats: -============== - -U-Boot is capable of booting (and performing other auxiliary operations on) -images in two formats: - -New uImage format (FIT) ------------------------ - -Flexible and powerful format based on Flattened Image Tree -- FIT (similar -to Flattened Device Tree). It allows the use of images with multiple -components (several kernels, ramdisks, etc.), with contents protected by -SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory. - - -Old uImage format ------------------ - -Old image format is based on binary files which can be basically anything, -preceded by a special header; see the definitions in include/image.h for -details; basically, the header defines the following image properties: - -* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, - 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, - LynxOS, pSOS, QNX, RTEMS, INTEGRITY; - Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS, - INTEGRITY). -* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86, - IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; - Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC). -* Compression Type (uncompressed, gzip, bzip2) -* Load Address -* Entry Point -* Image Name -* Image Timestamp - -The header is marked by a special Magic Number, and both the header -and the data portions of the image are secured against corruption by -CRC32 checksums. - - -Linux Support: -============== - -Although U-Boot should support any OS or standalone application -easily, the main focus has always been on Linux during the design of -U-Boot. - -U-Boot includes many features that so far have been part of some -special "boot loader" code within the Linux kernel. Also, any -"initrd" images to be used are no longer part of one big Linux image; -instead, kernel and "initrd" are separate images. This implementation -serves several purposes: - -- the same features can be used for other OS or standalone - applications (for instance: using compressed images to reduce the - Flash memory footprint) - -- it becomes much easier to port new Linux kernel versions because - lots of low-level, hardware dependent stuff are done by U-Boot - -- the same Linux kernel image can now be used with different "initrd" - images; of course this also means that different kernel images can - be run with the same "initrd". This makes testing easier (you don't - have to build a new "zImage.initrd" Linux image when you just - change a file in your "initrd"). Also, a field-upgrade of the - software is easier now. - - -Linux HOWTO: -============ - -Porting Linux to U-Boot based systems: ---------------------------------------- - -U-Boot cannot save you from doing all the necessary modifications to -configure the Linux device drivers for use with your target hardware -(no, we don't intend to provide a full virtual machine interface to -Linux :-). - -But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot). - -Just make sure your machine specific header file (for instance -include/asm-ppc/tqm8xx.h) includes the same definition of the Board -Information structure as we define in include/asm-<arch>/u-boot.h, -and make sure that your definition of IMAP_ADDR uses the same value -as your U-Boot configuration in CONFIG_SYS_IMMR. - - -Configuring the Linux kernel: ------------------------------ - -No specific requirements for U-Boot. Make sure you have some root -device (initial ramdisk, NFS) for your target system. - - -Building a Linux Image: ------------------------ - -With U-Boot, "normal" build targets like "zImage" or "bzImage" are -not used. If you use recent kernel source, a new build target -"uImage" will exist which automatically builds an image usable by -U-Boot. Most older kernels also have support for a "pImage" target, -which was introduced for our predecessor project PPCBoot and uses a -100% compatible format. - -Example: - - make TQM850L_config - make oldconfig - make dep - make uImage - -The "uImage" build target uses a special tool (in 'tools/mkimage') to -encapsulate a compressed Linux kernel image with header information, -CRC32 checksum etc. for use with U-Boot. This is what we are doing: - -* build a standard "vmlinux" kernel image (in ELF binary format): - -* convert the kernel into a raw binary image: - - ${CROSS_COMPILE}-objcopy -O binary \ - -R .note -R .comment \ - -S vmlinux linux.bin - -* compress the binary image: - - gzip -9 linux.bin - -* package compressed binary image for U-Boot: - - mkimage -A ppc -O linux -T kernel -C gzip \ - -a 0 -e 0 -n "Linux Kernel Image" \ - -d linux.bin.gz uImage - - -The "mkimage" tool can also be used to create ramdisk images for use -with U-Boot, either separated from the Linux kernel image, or -combined into one file. "mkimage" encapsulates the images with a 64 -byte header containing information about target architecture, -operating system, image type, compression method, entry points, time -stamp, CRC32 checksums, etc. - -"mkimage" can be called in two ways: to verify existing images and -print the header information, or to build new images. - -In the first form (with "-l" option) mkimage lists the information -contained in the header of an existing U-Boot image; this includes -checksum verification: - - tools/mkimage -l image - -l ==> list image header information - -The second form (with "-d" option) is used to build a U-Boot image -from a "data file" which is used as image payload: - - tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ - -n name -d data_file image - -A ==> set architecture to 'arch' - -O ==> set operating system to 'os' - -T ==> set image type to 'type' - -C ==> set compression type 'comp' - -a ==> set load address to 'addr' (hex) - -e ==> set entry point to 'ep' (hex) - -n ==> set image name to 'name' - -d ==> use image data from 'datafile' - -Right now, all Linux kernels for PowerPC systems use the same load -address (0x00000000), but the entry point address depends on the -kernel version: - -- 2.2.x kernels have the entry point at 0x0000000C, -- 2.3.x and later kernels have the entry point at 0x00000000. - -So a typical call to build a U-Boot image would read: - - -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ - > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ - > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \ - > examples/uImage.TQM850L - Image Name: 2.4.4 kernel for TQM850L - Created: Wed Jul 19 02:34:59 2000 - Image Type: PowerPC Linux Kernel Image (gzip compressed) - Data Size: 335725 Bytes = 327.86 kB = 0.32 MB - Load Address: 0x00000000 - Entry Point: 0x00000000 - -To verify the contents of the image (or check for corruption): - - -> tools/mkimage -l examples/uImage.TQM850L - Image Name: 2.4.4 kernel for TQM850L - Created: Wed Jul 19 02:34:59 2000 - Image Type: PowerPC Linux Kernel Image (gzip compressed) - Data Size: 335725 Bytes = 327.86 kB = 0.32 MB - Load Address: 0x00000000 - Entry Point: 0x00000000 - -NOTE: for embedded systems where boot time is critical you can trade -speed for memory and install an UNCOMPRESSED image instead: this -needs more space in Flash, but boots much faster since it does not -need to be uncompressed: - - -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz - -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ - > -A ppc -O linux -T kernel -C none -a 0 -e 0 \ - > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \ - > examples/uImage.TQM850L-uncompressed - Image Name: 2.4.4 kernel for TQM850L - Created: Wed Jul 19 02:34:59 2000 - Image Type: PowerPC Linux Kernel Image (uncompressed) - Data Size: 792160 Bytes = 773.59 kB = 0.76 MB - Load Address: 0x00000000 - Entry Point: 0x00000000 - - -Similar you can build U-Boot images from a 'ramdisk.image.gz' file -when your kernel is intended to use an initial ramdisk: - - -> tools/mkimage -n 'Simple Ramdisk Image' \ - > -A ppc -O linux -T ramdisk -C gzip \ - > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd - Image Name: Simple Ramdisk Image - Created: Wed Jan 12 14:01:50 2000 - Image Type: PowerPC Linux RAMDisk Image (gzip compressed) - Data Size: 566530 Bytes = 553.25 kB = 0.54 MB - Load Address: 0x00000000 - Entry Point: 0x00000000 - -The "dumpimage" is a tool to disassemble images built by mkimage. Its "-i" -option performs the converse operation of the mkimage's second form (the "-d" -option). Given an image built by mkimage, the dumpimage extracts a "data file" -from the image: - - tools/dumpimage -i image -p position data_file - -i ==> extract from the 'image' a specific 'data_file', \ - indexed by 'position' - - -Installing a Linux Image: -------------------------- - -To downloading a U-Boot image over the serial (console) interface, -you must convert the image to S-Record format: - - objcopy -I binary -O srec examples/image examples/image.srec - -The 'objcopy' does not understand the information in the U-Boot -image header, so the resulting S-Record file will be relative to -address 0x00000000. To load it to a given address, you need to -specify the target address as 'offset' parameter with the 'loads' -command. - -Example: install the image to address 0x40100000 (which on the -TQM8xxL is in the first Flash bank): - - => erase 40100000 401FFFFF - - .......... done - Erased 8 sectors - - => loads 40100000 - ## Ready for S-Record download ... - ~>examples/image.srec - 1 2 3 4 5 6 7 8 9 10 11 12 13 ... - ... - 15989 15990 15991 15992 - [file transfer complete] - [connected] - ## Start Addr = 0x00000000 - - -You can check the success of the download using the 'iminfo' command; -this includes a checksum verification so you can be sure no data -corruption happened: - - => imi 40100000 - - ## Checking Image at 40100000 ... - Image Name: 2.2.13 for initrd on TQM850L - Image Type: PowerPC Linux Kernel Image (gzip compressed) - Data Size: 335725 Bytes = 327 kB = 0 MB - Load Address: 00000000 - Entry Point: 0000000c - Verifying Checksum ... OK - - -Boot Linux: ------------ - -The "bootm" command is used to boot an application that is stored in -memory (RAM or Flash). In case of a Linux kernel image, the contents -of the "bootargs" environment variable is passed to the kernel as -parameters. You can check and modify this variable using the -"printenv" and "setenv" commands: - - - => printenv bootargs - bootargs=root=/dev/ram - - => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 - - => printenv bootargs - bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 - - => bootm 40020000 - ## Booting Linux kernel at 40020000 ... - Image Name: 2.2.13 for NFS on TQM850L - Image Type: PowerPC Linux Kernel Image (gzip compressed) - Data Size: 381681 Bytes = 372 kB = 0 MB - Load Address: 00000000 - Entry Point: 0000000c - Verifying Checksum ... OK - Uncompressing Kernel Image ... OK - Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000 - Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 - time_init: decrementer frequency = 187500000/60 - Calibrating delay loop... 49.77 BogoMIPS - Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000] - ... - -If you want to boot a Linux kernel with initial RAM disk, you pass -the memory addresses of both the kernel and the initrd image (PPBCOOT -format!) to the "bootm" command: - - => imi 40100000 40200000 - - ## Checking Image at 40100000 ... - Image Name: 2.2.13 for initrd on TQM850L - Image Type: PowerPC Linux Kernel Image (gzip compressed) - Data Size: 335725 Bytes = 327 kB = 0 MB - Load Address: 00000000 - Entry Point: 0000000c - Verifying Checksum ... OK - - ## Checking Image at 40200000 ... - Image Name: Simple Ramdisk Image - Image Type: PowerPC Linux RAMDisk Image (gzip compressed) - Data Size: 566530 Bytes = 553 kB = 0 MB - Load Address: 00000000 - Entry Point: 00000000 - Verifying Checksum ... OK - - => bootm 40100000 40200000 - ## Booting Linux kernel at 40100000 ... - Image Name: 2.2.13 for initrd on TQM850L - Image Type: PowerPC Linux Kernel Image (gzip compressed) - Data Size: 335725 Bytes = 327 kB = 0 MB - Load Address: 00000000 - Entry Point: 0000000c - Verifying Checksum ... OK - Uncompressing Kernel Image ... OK - ## Loading RAMDisk Image at 40200000 ... - Image Name: Simple Ramdisk Image - Image Type: PowerPC Linux RAMDisk Image (gzip compressed) - Data Size: 566530 Bytes = 553 kB = 0 MB - Load Address: 00000000 - Entry Point: 00000000 - Verifying Checksum ... OK - Loading Ramdisk ... OK - Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000 - Boot arguments: root=/dev/ram - time_init: decrementer frequency = 187500000/60 - Calibrating delay loop... 49.77 BogoMIPS - ... - RAMDISK: Compressed image found at block 0 - VFS: Mounted root (ext2 filesystem). - - bash# - -Boot Linux and pass a flat device tree: ------------ - -First, U-Boot must be compiled with the appropriate defines. See the section -titled "Linux Kernel Interface" above for a more in depth explanation. The -following is an example of how to start a kernel and pass an updated -flat device tree: - -=> print oftaddr -oftaddr=0x300000 -=> print oft -oft=oftrees/mpc8540ads.dtb -=> tftp $oftaddr $oft -Speed: 1000, full duplex -Using TSEC0 device -TFTP from server 192.168.1.1; our IP address is 192.168.1.101 -Filename 'oftrees/mpc8540ads.dtb'. -Load address: 0x300000 -Loading: # -done -Bytes transferred = 4106 (100a hex) -=> tftp $loadaddr $bootfile -Speed: 1000, full duplex -Using TSEC0 device -TFTP from server 192.168.1.1; our IP address is 192.168.1.2 -Filename 'uImage'. -Load address: 0x200000 -Loading:############ -done -Bytes transferred = 1029407 (fb51f hex) -=> print loadaddr -loadaddr=200000 -=> print oftaddr -oftaddr=0x300000 -=> bootm $loadaddr - $oftaddr -## Booting image at 00200000 ... - Image Name: Linux-2.6.17-dirty - Image Type: PowerPC Linux Kernel Image (gzip compressed) - Data Size: 1029343 Bytes = 1005.2 kB - Load Address: 00000000 - Entry Point: 00000000 - Verifying Checksum ... OK - Uncompressing Kernel Image ... OK -Booting using flat device tree at 0x300000 -Using MPC85xx ADS machine description -Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb -[snip] - - -More About U-Boot Image Types: ------------------------------- - -U-Boot supports the following image types: - - "Standalone Programs" are directly runnable in the environment - provided by U-Boot; it is expected that (if they behave - well) you can continue to work in U-Boot after return from - the Standalone Program. - "OS Kernel Images" are usually images of some Embedded OS which - will take over control completely. Usually these programs - will install their own set of exception handlers, device - drivers, set up the MMU, etc. - this means, that you cannot - expect to re-enter U-Boot except by resetting the CPU. - "RAMDisk Images" are more or less just data blocks, and their - parameters (address, size) are passed to an OS kernel that is - being started. - "Multi-File Images" contain several images, typically an OS - (Linux) kernel image and one or more data images like - RAMDisks. This construct is useful for instance when you want - to boot over the network using BOOTP etc., where the boot - server provides just a single image file, but you want to get - for instance an OS kernel and a RAMDisk image. - - "Multi-File Images" start with a list of image sizes, each - image size (in bytes) specified by an "uint32_t" in network - byte order. This list is terminated by an "(uint32_t)0". - Immediately after the terminating 0 follow the images, one by - one, all aligned on "uint32_t" boundaries (size rounded up to - a multiple of 4 bytes). - - "Firmware Images" are binary images containing firmware (like - U-Boot or FPGA images) which usually will be programmed to - flash memory. - - "Script files" are command sequences that will be executed by - U-Boot's command interpreter; this feature is especially - useful when you configure U-Boot to use a real shell (hush) - as command interpreter. - -Booting the Linux zImage: -------------------------- - -On some platforms, it's possible to boot Linux zImage. This is done -using the "bootz" command. The syntax of "bootz" command is the same -as the syntax of "bootm" command. - -Note, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply -kernel with raw initrd images. The syntax is slightly different, the -address of the initrd must be augmented by it's size, in the following -format: "<initrd addres>:<initrd size>". - - -Standalone HOWTO: -================= - -One of the features of U-Boot is that you can dynamically load and -run "standalone" applications, which can use some resources of -U-Boot like console I/O functions or interrupt services. - -Two simple examples are included with the sources: - -"Hello World" Demo: -------------------- - -'examples/hello_world.c' contains a small "Hello World" Demo -application; it is automatically compiled when you build U-Boot. -It's configured to run at address 0x00040004, so you can play with it -like that: - - => loads - ## Ready for S-Record download ... - ~>examples/hello_world.srec - 1 2 3 4 5 6 7 8 9 10 11 ... - [file transfer complete] - [connected] - ## Start Addr = 0x00040004 - - => go 40004 Hello World! This is a test. - ## Starting application at 0x00040004 ... - Hello World - argc = 7 - argv[0] = "40004" - argv[1] = "Hello" - argv[2] = "World!" - argv[3] = "This" - argv[4] = "is" - argv[5] = "a" - argv[6] = "test." - argv[7] = "<NULL>" - Hit any key to exit ... - - ## Application terminated, rc = 0x0 - -Another example, which demonstrates how to register a CPM interrupt -handler with the U-Boot code, can be found in 'examples/timer.c'. -Here, a CPM timer is set up to generate an interrupt every second. -The interrupt service routine is trivial, just printing a '.' -character, but this is just a demo program. The application can be -controlled by the following keys: - - ? - print current values og the CPM Timer registers - b - enable interrupts and start timer - e - stop timer and disable interrupts - q - quit application - - => loads - ## Ready for S-Record download ... - ~>examples/timer.srec - 1 2 3 4 5 6 7 8 9 10 11 ... - [file transfer complete] - [connected] - ## Start Addr = 0x00040004 - - => go 40004 - ## Starting application at 0x00040004 ... - TIMERS=0xfff00980 - Using timer 1 - tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0 - -Hit 'b': - [q, b, e, ?] Set interval 1000000 us - Enabling timer -Hit '?': - [q, b, e, ?] ........ - tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0 -Hit '?': - [q, b, e, ?] . - tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0 -Hit '?': - [q, b, e, ?] . - tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0 -Hit '?': - [q, b, e, ?] . - tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0 -Hit 'e': - [q, b, e, ?] ...Stopping timer -Hit 'q': - [q, b, e, ?] ## Application terminated, rc = 0x0 - - -Minicom warning: -================ - -Over time, many people have reported problems when trying to use the -"minicom" terminal emulation program for serial download. I (wd) -consider minicom to be broken, and recommend not to use it. Under -Unix, I recommend to use C-Kermit for general purpose use (and -especially for kermit binary protocol download ("loadb" command), and -use "cu" for S-Record download ("loads" command). See -http://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3. -for help with kermit. - - -Nevertheless, if you absolutely want to use it try adding this -configuration to your "File transfer protocols" section: - - Name Program Name U/D FullScr IO-Red. Multi - X kermit /usr/bin/kermit -i -l %l -s Y U Y N N - Y kermit /usr/bin/kermit -i -l %l -r N D Y N N - - -NetBSD Notes: -============= - -Starting at version 0.9.2, U-Boot supports NetBSD both as host -(build U-Boot) and target system (boots NetBSD/mpc8xx). - -Building requires a cross environment; it is known to work on -NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also -need gmake since the Makefiles are not compatible with BSD make). -Note that the cross-powerpc package does not install include files; -attempting to build U-Boot will fail because <machine/ansi.h> is -missing. This file has to be installed and patched manually: - - # cd /usr/pkg/cross/powerpc-netbsd/include - # mkdir powerpc - # ln -s powerpc machine - # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h - # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST - -Native builds *don't* work due to incompatibilities between native -and U-Boot include files. - -Booting assumes that (the first part of) the image booted is a -stage-2 loader which in turn loads and then invokes the kernel -proper. Loader sources will eventually appear in the NetBSD source -tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the -meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz - - -Implementation Internals: -========================= - -The following is not intended to be a complete description of every -implementation detail. However, it should help to understand the -inner workings of U-Boot and make it easier to port it to custom -hardware. - - -Initial Stack, Global Data: ---------------------------- - -The implementation of U-Boot is complicated by the fact that U-Boot -starts running out of ROM (flash memory), usually without access to -system RAM (because the memory controller is not initialized yet). -This means that we don't have writable Data or BSS segments, and BSS -is not initialized as zero. To be able to get a C environment working -at all, we have to allocate at least a minimal stack. Implementation -options for this are defined and restricted by the CPU used: Some CPU -models provide on-chip memory (like the IMMR area on MPC8xx and -MPC826x processors), on others (parts of) the data cache can be -locked as (mis-) used as memory, etc. - - Chris Hallinan posted a good summary of these issues to the - U-Boot mailing list: - - Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)? - From: "Chris Hallinan" <clh@net1plus.com> - Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET) - ... - - Correct me if I'm wrong, folks, but the way I understand it - is this: Using DCACHE as initial RAM for Stack, etc, does not - require any physical RAM backing up the cache. The cleverness - is that the cache is being used as a temporary supply of - necessary storage before the SDRAM controller is setup. It's - beyond the scope of this list to explain the details, but you - can see how this works by studying the cache architecture and - operation in the architecture and processor-specific manuals. - - OCM is On Chip Memory, which I believe the 405GP has 4K. It - is another option for the system designer to use as an - initial stack/RAM area prior to SDRAM being available. Either - option should work for you. Using CS 4 should be fine if your - board designers haven't used it for something that would - cause you grief during the initial boot! It is frequently not - used. - - CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere - with your processor/board/system design. The default value - you will find in any recent u-boot distribution in - walnut.h should work for you. I'd set it to a value larger - than your SDRAM module. If you have a 64MB SDRAM module, set - it above 400_0000. Just make sure your board has no resources - that are supposed to respond to that address! That code in - start.S has been around a while and should work as is when - you get the config right. - - -Chris Hallinan - DS4.COM, Inc. - -It is essential to remember this, since it has some impact on the C -code for the initialization procedures: - -* Initialized global data (data segment) is read-only. Do not attempt - to write it. - -* Do not use any uninitialized global data (or implicitely initialized - as zero data - BSS segment) at all - this is undefined, initiali- - zation is performed later (when relocating to RAM). - -* Stack space is very limited. Avoid big data buffers or things like - that. - -Having only the stack as writable memory limits means we cannot use -normal global data to share information beween the code. But it -turned out that the implementation of U-Boot can be greatly -simplified by making a global data structure (gd_t) available to all -functions. We could pass a pointer to this data as argument to _all_ -functions, but this would bloat the code. Instead we use a feature of -the GCC compiler (Global Register Variables) to share the data: we -place a pointer (gd) to the global data into a register which we -reserve for this purpose. - -When choosing a register for such a purpose we are restricted by the -relevant (E)ABI specifications for the current architecture, and by -GCC's implementation. - -For PowerPC, the following registers have specific use: - R1: stack pointer - R2: reserved for system use - R3-R4: parameter passing and return values - R5-R10: parameter passing - R13: small data area pointer - R30: GOT pointer - R31: frame pointer - - (U-Boot also uses R12 as internal GOT pointer. r12 - is a volatile register so r12 needs to be reset when - going back and forth between asm and C) - - ==> U-Boot will use R2 to hold a pointer to the global data - - Note: on PPC, we could use a static initializer (since the - address of the global data structure is known at compile time), - but it turned out that reserving a register results in somewhat - smaller code - although the code savings are not that big (on - average for all boards 752 bytes for the whole U-Boot image, - 624 text + 127 data). - -On Blackfin, the normal C ABI (except for P3) is followed as documented here: - http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface - - ==> U-Boot will use P3 to hold a pointer to the global data - -On ARM, the following registers are used: - - R0: function argument word/integer result - R1-R3: function argument word - R9: platform specific - R10: stack limit (used only if stack checking is enabled) - R11: argument (frame) pointer - R12: temporary workspace - R13: stack pointer - R14: link register - R15: program counter - - ==> U-Boot will use R9 to hold a pointer to the global data - - Note: on ARM, only R_ARM_RELATIVE relocations are supported. - -On Nios II, the ABI is documented here: - http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf - - ==> U-Boot will use gp to hold a pointer to the global data - - Note: on Nios II, we give "-G0" option to gcc and don't use gp - to access small data sections, so gp is free. - -On NDS32, the following registers are used: - - R0-R1: argument/return - R2-R5: argument - R15: temporary register for assembler - R16: trampoline register - R28: frame pointer (FP) - R29: global pointer (GP) - R30: link register (LP) - R31: stack pointer (SP) - PC: program counter (PC) - - ==> U-Boot will use R10 to hold a pointer to the global data - -NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope, -or current versions of GCC may "optimize" the code too much. - -Memory Management: ------------------- - -U-Boot runs in system state and uses physical addresses, i.e. the -MMU is not used either for address mapping nor for memory protection. - -The available memory is mapped to fixed addresses using the memory -controller. In this process, a contiguous block is formed for each -memory type (Flash, SDRAM, SRAM), even when it consists of several -physical memory banks. - -U-Boot is installed in the first 128 kB of the first Flash bank (on -TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After -booting and sizing and initializing DRAM, the code relocates itself -to the upper end of DRAM. Immediately below the U-Boot code some -memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN -configuration setting]. Below that, a structure with global Board -Info data is placed, followed by the stack (growing downward). - -Additionally, some exception handler code is copied to the low 8 kB -of DRAM (0x00000000 ... 0x00001FFF). - -So a typical memory configuration with 16 MB of DRAM could look like -this: - - 0x0000 0000 Exception Vector code - : - 0x0000 1FFF - 0x0000 2000 Free for Application Use - : - : - - : - : - 0x00FB FF20 Monitor Stack (Growing downward) - 0x00FB FFAC Board Info Data and permanent copy of global data - 0x00FC 0000 Malloc Arena - : - 0x00FD FFFF - 0x00FE 0000 RAM Copy of Monitor Code - ... eventually: LCD or video framebuffer - ... eventually: pRAM (Protected RAM - unchanged by reset) - 0x00FF FFFF [End of RAM] - - -System Initialization: ----------------------- - -In the reset configuration, U-Boot starts at the reset entry point -(on most PowerPC systems at address 0x00000100). Because of the reset -configuration for CS0# this is a mirror of the onboard Flash memory. -To be able to re-map memory U-Boot then jumps to its link address. -To be able to implement the initialization code in C, a (small!) -initial stack is set up in the internal Dual Ported RAM (in case CPUs -which provide such a feature like MPC8xx or MPC8260), or in a locked -part of the data cache. After that, U-Boot initializes the CPU core, -the caches and the SIU. - -Next, all (potentially) available memory banks are mapped using a -preliminary mapping. For example, we put them on 512 MB boundaries -(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash -on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is -programmed for SDRAM access. Using the temporary configuration, a -simple memory test is run that determines the size of the SDRAM -banks. - -When there is more than one SDRAM bank, and the banks are of -different size, the largest is mapped first. For equal size, the first -bank (CS2#) is mapped first. The first mapping is always for address -0x00000000, with any additional banks following immediately to create -contiguous memory starting from 0. - -Then, the monitor installs itself at the upper end of the SDRAM area -and allocates memory for use by malloc() and for the global Board -Info data; also, the exception vector code is copied to the low RAM -pages, and the final stack is set up. - -Only after this relocation will you have a "normal" C environment; -until that you are restricted in several ways, mostly because you are -running from ROM, and because the code will have to be relocated to a -new address in RAM. - - -U-Boot Porting Guide: ----------------------- - -[Based on messages by Jerry Van Baren in the U-Boot-Users mailing -list, October 2002] - - -int main(int argc, char *argv[]) -{ - sighandler_t no_more_time; - - signal(SIGALRM, no_more_time); - alarm(PROJECT_DEADLINE - toSec (3 * WEEK)); - - if (available_money > available_manpower) { - Pay consultant to port U-Boot; - return 0; - } - - Download latest U-Boot source; - - Subscribe to u-boot mailing list; - - if (clueless) - email("Hi, I am new to U-Boot, how do I get started?"); - - while (learning) { - Read the README file in the top level directory; - Read http://www.denx.de/twiki/bin/view/DULG/Manual; - Read applicable doc/*.README; - Read the source, Luke; - /* find . -name "*.[chS]" | xargs grep -i <keyword> */ - } - - if (available_money > toLocalCurrency ($2500)) - Buy a BDI3000; - else - Add a lot of aggravation and time; - - if (a similar board exists) { /* hopefully... */ - cp -a board/<similar> board/<myboard> - cp include/configs/<similar>.h include/configs/<myboard>.h - } else { - Create your own board support subdirectory; - Create your own board include/configs/<myboard>.h file; - } - Edit new board/<myboard> files - Edit new include/configs/<myboard>.h - - while (!accepted) { - while (!running) { - do { - Add / modify source code; - } until (compiles); - Debug; - if (clueless) - email("Hi, I am having problems..."); - } - Send patch file to the U-Boot email list; - if (reasonable critiques) - Incorporate improvements from email list code review; - else - Defend code as written; - } - - return 0; -} - -void no_more_time (int sig) -{ - hire_a_guru(); -} - - -Coding Standards: ------------------ - -All contributions to U-Boot should conform to the Linux kernel -coding style; see the file "Documentation/CodingStyle" and the script -"scripts/Lindent" in your Linux kernel source directory. - -Source files originating from a different project (for example the -MTD subsystem) are generally exempt from these guidelines and are not -reformated to ease subsequent migration to newer versions of those -sources. - -Please note that U-Boot is implemented in C (and to some small parts in -Assembler); no C++ is used, so please do not use C++ style comments (//) -in your code. - -Please also stick to the following formatting rules: -- remove any trailing white space -- use TAB characters for indentation and vertical alignment, not spaces -- make sure NOT to use DOS '\r\n' line feeds -- do not add more than 2 consecutive empty lines to source files -- do not add trailing empty lines to source files - -Submissions which do not conform to the standards may be returned -with a request to reformat the changes. - - -Submitting Patches: -------------------- - -Since the number of patches for U-Boot is growing, we need to -establish some rules. Submissions which do not conform to these rules -may be rejected, even when they contain important and valuable stuff. - -Please see http://www.denx.de/wiki/U-Boot/Patches for details. - -Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>; -see http://lists.denx.de/mailman/listinfo/u-boot - -When you send a patch, please include the following information with -it: - -* For bug fixes: a description of the bug and how your patch fixes - this bug. Please try to include a way of demonstrating that the - patch actually fixes something. - -* For new features: a description of the feature and your - implementation. - -* A CHANGELOG entry as plaintext (separate from the patch) - -* For major contributions, your entry to the CREDITS file - -* When you add support for a new board, don't forget to add a - maintainer e-mail address to the boards.cfg file, too. - -* If your patch adds new configuration options, don't forget to - document these in the README file. - -* The patch itself. If you are using git (which is *strongly* - recommended) you can easily generate the patch using the - "git format-patch". If you then use "git send-email" to send it to - the U-Boot mailing list, you will avoid most of the common problems - with some other mail clients. - - If you cannot use git, use "diff -purN OLD NEW". If your version of - diff does not support these options, then get the latest version of - GNU diff. - - The current directory when running this command shall be the parent - directory of the U-Boot source tree (i. e. please make sure that - your patch includes sufficient directory information for the - affected files). - - We prefer patches as plain text. MIME attachments are discouraged, - and compressed attachments must not be used. - -* If one logical set of modifications affects or creates several - files, all these changes shall be submitted in a SINGLE patch file. - -* Changesets that contain different, unrelated modifications shall be - submitted as SEPARATE patches, one patch per changeset. - - -Notes: - -* Before sending the patch, run the MAKEALL script on your patched - source tree and make sure that no errors or warnings are reported - for any of the boards. - -* Keep your modifications to the necessary minimum: A patch - containing several unrelated changes or arbitrary reformats will be - returned with a request to re-formatting / split it. - -* If you modify existing code, make sure that your new code does not - add to the memory footprint of the code ;-) Small is beautiful! - When adding new features, these should compile conditionally only - (using #ifdef), and the resulting code with the new feature - disabled must not need more memory than the old code without your - modification. - -* Remember that there is a size limit of 100 kB per message on the - u-boot mailing list. Bigger patches will be moderated. If they are - reasonable and not too big, they will be acknowledged. But patches - bigger than the size limit should be avoided. |