doc/README.davinci

   1 Summary
   2 =======
   3
   4 Note: this document used to be about the entire family of DaVinci SOCs but the
   5 support for the DM* family and DA830 has since been dropped.
   6
   7 This README is about U-Boot support for TI's DA850 SoC. This SOC has an OMAP
   8 part number but is very similar to the DaVinci series.
   9
  10 Currently the following boards are supported:
  11
  12 * TI DA850 EVM
  13
  14 * TI OMAP-L138 LCDK
  15
  16 * Lego EV3
  17
  18 Build
  19 =====
  20
  21 * TI DA850 EVM:
  22
  23 make da850evm_config
  24 make
  25
  26 * TI OMAP-L138 LCDK
  27
  28 make omapl138_lcdk_defconfig
  29 make
  30
  31 * Lego EV3
  32
  33 make legoev3_defconfig
  34 make
  35
  36 Bootloaders
  37 ===============
  38
  39 For DA850 an SPL (secondary program loader, see doc/README.SPL) is provided
  40 to load U-Boot from SPI flash, MMC or NAND. The SPL takes care of the low level
  41 initialization.
  42
  43 The SPL is built as u-boot.ais for all DA850 defconfigs except those booting
  44 from NOR flash. The resulting image file can be programmed to the SPI flash
  45 of the DA850 EVM/LCDK.
  46
  47 Devices that support booting from NOR utilize execute in place (XIP) and do
  48 not require SPL to perform low level initialization.
  49
  50 Environment Variables
  51 =====================
  52
  53 The DA850 EVM allows the user to specify the maximum cpu clock allowed by the
  54 silicon, in Hz, via an environment variable "maxcpuclk".
  55
  56 The maximum clock rate allowed depends on the silicon populated on the EVM.
  57 Please make sure you understand the restrictions placed on this clock in the
  58 device specific datasheet before setting up this variable. This information is
  59 passed to the Linux kernel using the ATAG_REVISION atag.
  60
  61 If "maxcpuclk" is not defined, the configuration CFG_DA850_EVM_MAX_CPU_CLK
  62 is used to obtain this information.
  63
  64 Links
  65 =====
  66
  67 1) TI DA850 EVM
  68 http://focus.ti.com/docs/prod/folders/print/omap-l138.html
  69 http://www.logicpd.com/products/development-kits/zoom-omap-l138-evm-development-kit
  70
  71 2) TI OMAP-L138 LCDK
  72 http://focus.ti.com/docs/prod/folders/print/omap-l138.html
  73 http://www.ti.com/tool/TMDXLCDK138
  74
  75 Davinci special defines
  76 =======================
  77
  78 CFG_SYS_DV_NOR_BOOT_CFG:        AM18xx based boards, booting in NOR Boot mode
  79                                 need a "NOR Boot Configuration Word" stored
  80                                 in the NOR Flash. This define adds this.
  81                                 More Info about this, see:
  82                                 spraba5a.pdf chapter 3.1