83 lines
2.1 KiB
Plaintext
83 lines
2.1 KiB
Plaintext
Summary
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=======
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Note: this document used to be about the entire family of DaVinci SOCs but the
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support for the DM* family and DA830 has since been dropped.
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This README is about U-Boot support for TI's DA850 SoC. This SOC has an OMAP
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part number but is very similar to the DaVinci series.
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Currently the following boards are supported:
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* TI DA850 EVM
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* TI OMAP-L138 LCDK
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* Lego EV3
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Build
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=====
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* TI DA850 EVM:
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make da850evm_config
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make
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* TI OMAP-L138 LCDK
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make omapl138_lcdk_defconfig
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make
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* Lego EV3
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make legoev3_defconfig
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make
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Bootloaders
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===============
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For DA850 an SPL (secondary program loader, see doc/README.SPL) is provided
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to load U-Boot from SPI flash, MMC or NAND. The SPL takes care of the low level
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initialization.
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The SPL is built as u-boot.ais for all DA850 defconfigs except those booting
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from NOR flash. The resulting image file can be programmed to the SPI flash
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of the DA850 EVM/LCDK.
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Devices that support booting from NOR utilize execute in place (XIP) and do
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not require SPL to perform low level initialization.
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Environment Variables
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=====================
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The DA850 EVM allows the user to specify the maximum cpu clock allowed by the
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silicon, in Hz, via an environment variable "maxcpuclk".
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The maximum clock rate allowed depends on the silicon populated on the EVM.
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Please make sure you understand the restrictions placed on this clock in the
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device specific datasheet before setting up this variable. This information is
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passed to the Linux kernel using the ATAG_REVISION atag.
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If "maxcpuclk" is not defined, the configuration CONFIG_DA850_EVM_MAX_CPU_CLK
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is used to obtain this information.
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Links
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=====
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1) TI DA850 EVM
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http://focus.ti.com/docs/prod/folders/print/omap-l138.html
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http://www.logicpd.com/products/development-kits/zoom-omap-l138-evm-development-kit
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2) TI OMAP-L138 LCDK
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http://focus.ti.com/docs/prod/folders/print/omap-l138.html
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http://www.ti.com/tool/TMDXLCDK138
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Davinci special defines
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=======================
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CONFIG_SYS_DV_NOR_BOOT_CFG: AM18xx based boards, booting in NOR Boot mode
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need a "NOR Boot Configuration Word" stored
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in the NOR Flash. This define adds this.
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More Info about this, see:
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spraba5a.pdf chapter 3.1
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