projects / thirdparty / u-boot.git / blame
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|---|---|---|
| 6406d6da SP |
1 | Summary |
| 2 | ======= | |
| 3 | ||
| 655d216a BG |
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. | |
| 6406d6da | 6 | |
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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. | |
| 6406d6da | 9 | |
| 655d216a | 10 | Currently the following boards are supported: |
| 6406d6da | 11 | |
| 718f7464 SN |
12 | * TI DA850 EVM |
| 13 | ||
| 655d216a | 14 | * TI OMAP-L138 LCDK |
| 6406d6da | 15 | |
| 655d216a | 16 | * Lego EV3 |
| 6406d6da SP |
17 | |
| 18 | Build | |
| 19 | ===== | |
| 20 | ||
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21 | * TI DA850 EVM: |
| 22 | ||
| 23 | make da850evm_config | |
| 24 | make | |
| 25 | ||
| 655d216a | 26 | * TI OMAP-L138 LCDK |
| 6406d6da | 27 | |
| 655d216a | 28 | make omapl138_lcdk_defconfig |
| 6406d6da SP |
29 | make |
| 30 | ||
| 655d216a | 31 | * Lego EV3 |
| 6406d6da | 32 | |
| 655d216a | 33 | make legoev3_defconfig |
| 6406d6da SP |
34 | make |
| 35 | ||
| 36 | Bootloaders | |
| 37 | =============== | |
| 38 | ||
| 655d216a | 39 | For DA850 an SPL (secondary program loader, see doc/README.SPL) is provided |
| 5f1600e0 | 40 | to load U-Boot from SPI flash, MMC or NAND. The SPL takes care of the low level |
| 655d216a BG |
41 | initialization. |
| 42 | ||
| 5f1600e0 AF |
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. | |
| 3d2c8e6c | 49 | |
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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 | ||
| 6e7df1d1 | 61 | If "maxcpuclk" is not defined, the configuration CFG_DA850_EVM_MAX_CPU_CLK |
| 4f6fc15b SN |
62 | is used to obtain this information. |
| 63 | ||
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64 | Links |
| 65 | ===== | |
| 66 | ||
| 655d216a | 67 | 1) TI DA850 EVM |
| 718f7464 SN |
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 | |
| 337c4333 | 70 | |
| 655d216a BG |
71 | 2) TI OMAP-L138 LCDK |
| 72 | http://focus.ti.com/docs/prod/folders/print/omap-l138.html | |
| a94a4071 | 73 | https://www.ti.com/tool/TMDXLCDK138 |
| 655d216a | 74 | |
| 337c4333 HS |
75 | Davinci special defines |
| 76 | ======================= | |
| 77 | ||
| 65cc0e2a | 78 | CFG_SYS_DV_NOR_BOOT_CFG: AM18xx based boards, booting in NOR Boot mode |
| 337c4333 HS |
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 |