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-Generic SPL framework
-=====================
-
-Overview
---------
-
-To unify all existing implementations for a secondary program loader (SPL)
-and to allow simply adding of new implementations this generic SPL framework
-has been created. With this framework almost all source files for a board
-can be reused. No code duplication or symlinking is necessary anymore.
-
-
-How it works
-------------
-
-There is a new directory $(srctree)/spl which contains only a Makefile.
-The object files are built separately for SPL and placed in this directory.
-The final binaries which are generated are u-boot-spl, u-boot-spl.bin and
-u-boot-spl.map.
-
-During the SPL build a variable named CONFIG_SPL_BUILD is exported
-in the make environment and also appended to CPPFLAGS with -DCONFIG_SPL_BUILD.
-Source files can therefore be compiled for SPL with different settings.
-ARM-based boards have previously used the option CONFIG_PRELOADER for it.
-
-For example:
-
-ifeq ($(CONFIG_SPL_BUILD),y)
-COBJS-y += board_spl.o
-else
-COBJS-y += board.o
-endif
-
-COBJS-$(CONFIG_SPL_BUILD) += foo.o
-
-#ifdef CONFIG_SPL_BUILD
-	foo();
-#endif
-
-
-The building of SPL images can be with:
-
-#define CONFIG_SPL
-
-Because SPL images normally have a different text base, one has to be
-configured by defining CONFIG_SPL_TEXT_BASE. The linker script has to be
-defined with CONFIG_SPL_LDSCRIPT.
-
-To support generic U-Boot libraries and drivers in the SPL binary one can
-optionally define CONFIG_SPL_XXX_SUPPORT. Currently following options
-are supported:
-
-CONFIG_SPL_LIBCOMMON_SUPPORT (common/libcommon.o)
-CONFIG_SPL_LIBDISK_SUPPORT (disk/libdisk.o)
-CONFIG_SPL_I2C_SUPPORT (drivers/i2c/libi2c.o)
-CONFIG_SPL_GPIO_SUPPORT (drivers/gpio/libgpio.o)
-CONFIG_SPL_MMC_SUPPORT (drivers/mmc/libmmc.o)
-CONFIG_SPL_SERIAL_SUPPORT (drivers/serial/libserial.o)
-CONFIG_SPL_SPI_FLASH_SUPPORT (drivers/mtd/spi/libspi_flash.o)
-CONFIG_SPL_SPI_SUPPORT (drivers/spi/libspi.o)
-CONFIG_SPL_FAT_SUPPORT (fs/fat/libfat.o)
-CONFIG_SPL_LIBGENERIC_SUPPORT (lib/libgeneric.o)
-CONFIG_SPL_POWER_SUPPORT (drivers/power/libpower.o)
-CONFIG_SPL_NAND_SUPPORT (drivers/mtd/nand/libnand.o)
-CONFIG_SPL_DRIVERS_MISC_SUPPORT (drivers/misc)
-CONFIG_SPL_DMA_SUPPORT (drivers/dma/libdma.o)
-CONFIG_SPL_POST_MEM_SUPPORT (post/drivers/memory.o)
-CONFIG_SPL_NAND_LOAD (drivers/mtd/nand/nand_spl_load.o)
-CONFIG_SPL_SPI_LOAD (drivers/mtd/spi/spi_spl_load.o)
-CONFIG_SPL_RAM_DEVICE (common/spl/spl.c)
-CONFIG_SPL_WATCHDOG_SUPPORT (drivers/watchdog/libwatchdog.o)
-
-Normally CPU is assumed to be the same between the SPL and normal
-u-boot build.  However it is possible to specify a different CPU for
-the SPL build for cases where the SPL is expected to run on a
-different CPU model from the main u-boot.  This is done by specifying
-an SPL CPU in boards.cfg as follows:
-
-	normal_cpu:spl_cpu
-
-This case CPU will be set to "normal_cpu" during the main u-boot
-build and "spl_cpu" during the SPL build.
-
-
-Debugging
----------
-
-When building SPL with DEBUG set you may also need to set CONFIG_PANIC_HANG
-as in most cases do_reset is not defined within SPL.
-
-
-Estimating stack usage
-----------------------
-
-With gcc 4.6 (and later) and the use of GNU cflow it is possible to estimate
-stack usage at various points in run sequence of SPL.  The -fstack-usage option
-to gcc will produce '.su' files (such as arch/arm/cpu/armv7/syslib.su) that
-will give stack usage information and cflow can construct program flow.
-
-Must have gcc 4.6 or later, which supports -fstack-usage
-
-1) Build normally
-2) Perform the following shell command to generate a list of C files used in
-SPL:
-$ find spl -name '*.su' | sed -e 's:^spl/::' -e 's:[.]su$:.c:' > used-spl.list
-3) Execute cflow:
-$ cflow --main=board_init_r `cat used-spl.list` 2>&1 | $PAGER
-
-cflow will spit out a number of warnings as it does not parse
-the config files and picks functions based on #ifdef.  Parsing the '.i'
-files instead introduces another set of headaches.  These warnings are
-not usually important to understanding the flow, however.