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diff --git a/qemu/roms/u-boot/doc/README.davinci b/qemu/roms/u-boot/doc/README.davinci new file mode 100644 index 000000000..aa7c85011 --- /dev/null +++ b/qemu/roms/u-boot/doc/README.davinci @@ -0,0 +1,159 @@ +Summary +======= + +This README is about U-Boot support for TI's ARM 926EJS based family of SoCs. +These SOCs are used for cameras, video security and surveillance, DVR's, etc. +DaVinci SOC's comprise of DM644x, DM646x, DM35x and DM36x series of SOC's +Additionally there are some SOCs meant for the audio market which though have +an OMAP part number are very similar to the DaVinci series of SOC's +Additionally, some family members contain a TI DSP and/or graphics +co processors along with a host of other peripherals. + +Currently the following boards are supported: + +* TI DaVinci DM644x EVM + +* TI DaVinci DM646x EVM + +* TI DaVinci DM355 EVM + +* TI DaVinci DM365 EVM + +* TI DA830 EVM + +* TI DA850 EVM + +* DM355 based Leopard board + +* DM644x based schmoogie board + +* DM644x based sffsdr board + +* DM644x based sonata board + +Build +===== + +* TI DaVinci DM644x EVM: + +make davinci_dvevm_config +make + +* TI DaVinci DM646x EVM: + +make davinci_dm6467evm_config +make + +* TI DaVinci DM355 EVM: + +make davinci_dm355evm_config +make + +* TI DaVinci DM365 EVM: + +make davinci_dm365evm_config +make + +* TI DA830 EVM: + +make da830evm_config +make + +* TI DA850 EVM: + +make da850evm_config +make + +* DM355 based Leopard board: + +make davinci_dm355leopard_config +make + +* DM644x based schmoogie board: + +make davinci_schmoogie_config +make + +* DM644x based sffsdr board: + +make davinci_sffsdr_config +make + +* DM644x based sonata board: + +make davinci_sonata_config +make + +Bootloaders +=============== + +The DaVinci SOC's use 2 bootloaders. The low level initialization +is done by a UBL(user boot loader). The UBL is written to a NAND/NOR/SPI flash +by a programmer. During initial bootup, the ROM Bootloader reads the UBL +from a storage device and loads it into the IRAM. The UBL then loads the U-Boot +into the RAM. +The programmers and UBL are always released as part of any standard TI +software release associated with an SOC. + +Alternative boot method (DA850 EVM only): +For the DA850 EVM an SPL (secondary program loader, see doc/README.SPL) +is provided to load U-Boot directly from SPI flash. In this case, the +SPL does the low level initialization that is otherwise done by the SPL. +To build U-Boot with this SPL, do +make da850evm_config +make u-boot.ais +and program the resulting u-boot.ais file to the SPI flash of the DA850 EVM. + +Environment Variables +===================== + +The DA850 EVM allows the user to specify the maximum cpu clock allowed by the +silicon, in Hz, via an environment variable "maxcpuclk". + +The maximum clock rate allowed depends on the silicon populated on the EVM. +Please make sure you understand the restrictions placed on this clock in the +device specific datasheet before setting up this variable. This information is +passed to the Linux kernel using the ATAG_REVISION atag. + +If "maxcpuclk" is not defined, the configuration CONFIG_DA850_EVM_MAX_CPU_CLK +is used to obtain this information. + +Links +===== + +1) TI DaVinci DM355 EVM: +http://focus.ti.com/docs/prod/folders/print/tms320dm355.html +http://www.spectrumdigital.com/product_info.php?cPath=103&products_id=203&osCsid=c499af6087317f11b3da19b4e8f1af32 + +2) TI DaVinci DM365 EVM: +http://focus.ti.com/docs/prod/folders/print/tms320dm365.html?247SEM= +http://support.spectrumdigital.com/boards/evmdm365/revc/ + +3) DaVinci DM355 based leopard board +http://designsomething.org/leopardboard/default.aspx +http://www.spectrumdigital.com/product_info.php?cPath=103&products_id=192&osCsid=67c20335668ffc57cb35727106eb24b1 + +4) TI DaVinci DM6467 EVM: +http://focus.ti.com/docs/prod/folders/print/tms320dm6467.html +http://support.spectrumdigital.com/boards/evmdm6467/revf/ + +5) TI DaVinci DM6446 EVM: +http://focus.ti.com/docs/prod/folders/print/tms320dm6446.html +http://www.spectrumdigital.com/product_info.php?cPath=103&products_id=222 + +6) TI DA830 EVM +http://focus.ti.com/apps/docs/gencontent.tsp?appId=1&contentId=52385 +http://www.spectrumdigital.com/product_info.php?cPath=37&products_id=214 + +7) TI DA850 EVM +http://focus.ti.com/docs/prod/folders/print/omap-l138.html +http://www.logicpd.com/products/development-kits/zoom-omap-l138-evm-development-kit + +Davinci special defines +======================= + +CONFIG_SYS_DV_NOR_BOOT_CFG: AM18xx based boards, booting in NOR Boot mode + need a "NOR Boot Configuration Word" stored + in the NOR Flash. This define adds this. + More Info about this, see: + spraba5a.pdf chapter 3.1 |