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Summary
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=======
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This README is about U-Boot support for TI's ARM 926EJS based family of SoCs.
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These SOCs are used for cameras, video security and surveillance, DVR's, etc.
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DaVinci SOC's comprise of DM644x, DM646x, DM35x and DM36x series of SOC's
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Additionally there are some SOCs meant for the audio market which though have
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an OMAP part number are very similar to the DaVinci series of SOC's
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Additionally, some family members contain a TI DSP and/or graphics
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co processors along with a host of other peripherals.
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Currently the following boards are supported:
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* TI DaVinci DM644x EVM
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* TI DaVinci DM646x EVM
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* TI DaVinci DM355 EVM
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* TI DaVinci DM365 EVM
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* TI DA830 EVM
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* TI DA850 EVM
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* DM355 based Leopard board
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* DM644x based schmoogie board
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* DM644x based sffsdr board
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* DM644x based sonata board
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Build
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=====
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* TI DaVinci DM644x EVM:
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make davinci_dvevm_config
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make
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* TI DaVinci DM646x EVM:
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make davinci_dm6467evm_config
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make
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* TI DaVinci DM355 EVM:
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make davinci_dm355evm_config
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make
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* TI DaVinci DM365 EVM:
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make davinci_dm365evm_config
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make
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* TI DA830 EVM:
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make da830evm_config
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make
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* TI DA850 EVM:
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make da850evm_config
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make
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* DM355 based Leopard board:
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make davinci_dm355leopard_config
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make
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* DM644x based schmoogie board:
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make davinci_schmoogie_config
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make
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* DM644x based sffsdr board:
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make davinci_sffsdr_config
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make
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* DM644x based sonata board:
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make davinci_sonata_config
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make
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Bootloaders
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===============
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The DaVinci SOC's use 2 bootloaders. The low level initialization
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is done by a UBL(user boot loader). The UBL is written to a NAND/NOR/SPI flash
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by a programmer. During initial bootup, the ROM Bootloader reads the UBL
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from a storage device and loads it into the IRAM. The UBL then loads the U-Boot
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into the RAM.
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The programmers and UBL are always released as part of any standard TI
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software release associated with an SOC.
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Alternative boot method (DA850 EVM only):
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For the DA850 EVM an SPL (secondary program loader, see doc/README.SPL)
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is provided to load U-Boot directly from SPI flash. In this case, the
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SPL does the low level initialization that is otherwise done by the SPL.
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To build U-Boot with this SPL, do
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make da850evm_config
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make u-boot.ais
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and program the resulting u-boot.ais file to the SPI flash of the DA850 EVM.
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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 DaVinci DM355 EVM:
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http://focus.ti.com/docs/prod/folders/print/tms320dm355.html
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http://www.spectrumdigital.com/product_info.php?cPath=103&products_id=203&osCsid=c499af6087317f11b3da19b4e8f1af32
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2) TI DaVinci DM365 EVM:
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http://focus.ti.com/docs/prod/folders/print/tms320dm365.html?247SEM=
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http://support.spectrumdigital.com/boards/evmdm365/revc/
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3) DaVinci DM355 based leopard board
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http://designsomething.org/leopardboard/default.aspx
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http://www.spectrumdigital.com/product_info.php?cPath=103&products_id=192&osCsid=67c20335668ffc57cb35727106eb24b1
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4) TI DaVinci DM6467 EVM:
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http://focus.ti.com/docs/prod/folders/print/tms320dm6467.html
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http://support.spectrumdigital.com/boards/evmdm6467/revf/
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5) TI DaVinci DM6446 EVM:
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http://focus.ti.com/docs/prod/folders/print/tms320dm6446.html
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http://www.spectrumdigital.com/product_info.php?cPath=103&products_id=222
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6) TI DA830 EVM
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http://focus.ti.com/apps/docs/gencontent.tsp?appId=1&contentId=52385
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http://www.spectrumdigital.com/product_info.php?cPath=37&products_id=214
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7) 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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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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