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- 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
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