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diff --git a/roms/u-boot/doc/README.davinci b/roms/u-boot/doc/README.davinci new file mode 100644 index 000000000..607531af2 --- /dev/null +++ b/roms/u-boot/doc/README.davinci @@ -0,0 +1,82 @@ +Summary +======= + +Note: this document used to be about the entire family of DaVinci SOCs but the +support for the DM* family and DA830 has since been dropped. + +This README is about U-Boot support for TI's DA850 SoC. This SOC has an OMAP +part number but is very similar to the DaVinci series. + +Currently the following boards are supported: + +* TI DA850 EVM + +* TI OMAP-L138 LCDK + +* Lego EV3 + +Build +===== + +* TI DA850 EVM: + +make da850evm_config +make + +* TI OMAP-L138 LCDK + +make omapl138_lcdk_defconfig +make + +* Lego EV3 + +make legoev3_defconfig +make + +Bootloaders +=============== + +For DA850 an SPL (secondary program loader, see doc/README.SPL) is provided +to load U-Boot from SPI flash, MMC or NAND. The SPL takes care of the low level +initialization. + +The SPL is built as u-boot.ais for all DA850 defconfigs except those booting +from NOR flash. The resulting image file can be programmed to the SPI flash +of the DA850 EVM/LCDK. + +Devices that support booting from NOR utilize execute in place (XIP) and do +not require SPL to perform low level initialization. + +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 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 + +2) TI OMAP-L138 LCDK +http://focus.ti.com/docs/prod/folders/print/omap-l138.html +http://www.ti.com/tool/TMDXLCDK138 + +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 |