1Summary
2=======
3
4Note: this document used to be about the entire family of DaVinci SOCs but the
5support for the DM* family and DA830 has since been dropped.
6
7This README is about U-Boot support for TI's DA850 SoC. This SOC has an OMAP
8part number but is very similar to the DaVinci series.
9
10Currently the following boards are supported:
11
12* TI DA850 EVM
13
14* TI OMAP-L138 LCDK
15
16* Lego EV3
17
18Build
19=====
20
21* TI DA850 EVM:
22
23make da850evm_config
24make
25
26* TI OMAP-L138 LCDK
27
28make omapl138_lcdk_defconfig
29make
30
31* Lego EV3
32
33make legoev3_defconfig
34make
35
36Bootloaders
37===============
38
39For DA850 an SPL (secondary program loader, see doc/README.SPL) is provided
40to load U-Boot from SPI flash, MMC or NAND. The SPL takes care of the low level
41initialization.
42
43The SPL is built as u-boot.ais for all DA850 defconfigs except those booting
44from NOR flash. The resulting image file can be programmed to the SPI flash
45of the DA850 EVM/LCDK.
46
47Devices that support booting from NOR utilize execute in place (XIP) and do
48not require SPL to perform low level initialization.
49
50Environment Variables
51=====================
52
53The DA850 EVM allows the user to specify the maximum cpu clock allowed by the
54silicon, in Hz, via an environment variable "maxcpuclk".
55
56The maximum clock rate allowed depends on the silicon populated on the EVM.
57Please make sure you understand the restrictions placed on this clock in the
58device specific datasheet before setting up this variable. This information is
59passed to the Linux kernel using the ATAG_REVISION atag.
60
61If "maxcpuclk" is not defined, the configuration CFG_DA850_EVM_MAX_CPU_CLK
62is used to obtain this information.
63
64Links
65=====
66
671) TI DA850 EVM
68http://focus.ti.com/docs/prod/folders/print/omap-l138.html
69http://www.logicpd.com/products/development-kits/zoom-omap-l138-evm-development-kit
70
712) TI OMAP-L138 LCDK
72http://focus.ti.com/docs/prod/folders/print/omap-l138.html
73https://www.ti.com/tool/TMDXLCDK138
74
75Davinci special defines
76=======================
77
78CFG_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
83