README.davinci 2.0 KB

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  1. Summary
  2. =======
  3. Note: this document used to be about the entire family of DaVinci SOCs but the
  4. support for the DM* family and DA830 has since been dropped.
  5. This README is about U-Boot support for TI's DA850 SoC. This SOC has an OMAP
  6. part number but is very similar to the DaVinci series.
  7. Currently the following boards are supported:
  8. * TI DA850 EVM
  9. * TI OMAP-L138 LCDK
  10. * Lego EV3
  11. Build
  12. =====
  13. * TI DA850 EVM:
  14. make da850evm_config
  15. make
  16. * TI OMAP-L138 LCDK
  17. make omapl138_lcdk_defconfig
  18. make
  19. * Lego EV3
  20. make legoev3_defconfig
  21. make
  22. Bootloaders
  23. ===============
  24. For DA850 an SPL (secondary program loader, see doc/README.SPL) is provided
  25. to load U-Boot directly from SPI flash. The SPL takes care of the low level
  26. initialization.
  27. The SPL is built as u-boot.ais for all DA850 defconfigs. The resulting
  28. image file can be programmed to the SPI flash of the DA850 EVM/LCDK.
  29. Environment Variables
  30. =====================
  31. The DA850 EVM allows the user to specify the maximum cpu clock allowed by the
  32. silicon, in Hz, via an environment variable "maxcpuclk".
  33. The maximum clock rate allowed depends on the silicon populated on the EVM.
  34. Please make sure you understand the restrictions placed on this clock in the
  35. device specific datasheet before setting up this variable. This information is
  36. passed to the Linux kernel using the ATAG_REVISION atag.
  37. If "maxcpuclk" is not defined, the configuration CONFIG_DA850_EVM_MAX_CPU_CLK
  38. is used to obtain this information.
  39. Links
  40. =====
  41. 1) TI DA850 EVM
  42. http://focus.ti.com/docs/prod/folders/print/omap-l138.html
  43. http://www.logicpd.com/products/development-kits/zoom-omap-l138-evm-development-kit
  44. 2) TI OMAP-L138 LCDK
  45. http://focus.ti.com/docs/prod/folders/print/omap-l138.html
  46. http://www.ti.com/tool/TMDXLCDK138
  47. Davinci special defines
  48. =======================
  49. CONFIG_SYS_DV_NOR_BOOT_CFG: AM18xx based boards, booting in NOR Boot mode
  50. need a "NOR Boot Configuration Word" stored
  51. in the NOR Flash. This define adds this.
  52. More Info about this, see:
  53. spraba5a.pdf chapter 3.1