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board/ti/am335x/README: update for NAND boot
NAND boot mode on AM335x EVM has been verified, and steps to use it has been documented and update in this README Signed-off-by: Pekon Gupta <pekon@ti.com> Acked-by: Peter Korsgaard <jacmet@sunsite.dk> Acked-by: Tom Rini <trini@ti.com>
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@ -46,23 +46,42 @@ NAND
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The AM335x GP EVM ships with a 256MiB NAND available in most profiles. In
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this example to program the NAND we assume that an SD card has been
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inserted with the files to write in the first SD slot and that mtdparts
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have been configured correctly for the board. As a time saving measure we
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load MLO into memory in one location, copy it into the three locatations
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that the ROM checks for additional valid copies, then load U-Boot into
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memory. We then write that whole section of memory to NAND.
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have been configured correctly for the board. All images are first loaded
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into memory, then written to NAND.
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U-Boot # mmc rescan
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U-Boot # env default -f -a
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U-Boot # nand erase.chip
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U-Boot # saveenv
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U-Boot # load mmc 0 81000000 MLO
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U-Boot # cp.b 81000000 81020000 20000
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U-Boot # cp.b 81000000 81040000 20000
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U-Boot # cp.b 81000000 81060000 20000
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U-Boot # load mmc 0 81080000 u-boot.img
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U-Boot # nand write 81000000 0 260000
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U-Boot # load mmc 0 ${loadaddr} uImage
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U-Boot # nand write ${loadaddr} kernel 500000
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Step-1: Building u-boot for NAND boot
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Set following CONFIGxx options for NAND device.
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CONFIG_SYS_NAND_PAGE_SIZE number of main bytes in NAND page
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CONFIG_SYS_NAND_OOBSIZE number of OOB bytes in NAND page
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CONFIG_SYS_NAND_BLOCK_SIZE number of bytes in NAND erase-block
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CONFIG_SYS_NAND_ECCPOS ECC map for NAND page
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CONFIG_NAND_OMAP_ECCSCHEME (refer doc/README.nand)
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Step-2: Flashing NAND via MMC/SD
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# select BOOTSEL to MMC/SD boot and boot from MMC/SD card
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U-Boot # mmc rescan
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# erase flash
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U-Boot # nand erase.chip
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U-Boot # env default -f -a
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U-Boot # saveenv
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# flash MLO. Redundant copies of MLO are kept for failsafe
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U-Boot # load mmc 0 0x82000000 MLO
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U-Boot # nand write 0x82000000 0x00000 0x20000
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U-Boot # nand write 0x82000000 0x20000 0x20000
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U-Boot # nand write 0x82000000 0x40000 0x20000
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U-Boot # nand write 0x82000000 0x60000 0x20000
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# flash u-boot.img
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U-Boot # load mmc 0 0x82000000 u-boot.img
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U-Boot # nand write 0x82000000 0x80000 0x60000
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# flash kernel image
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U-Boot # load mmc 0 0x82000000 uImage
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U-Boot # nand write 0x82000000 ${nandsrcaddr} ${nandimgsize}
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# flash filesystem image
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U-Boot # load mmc 0 0x82000000 filesystem.img
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U-Boot # nand write 0x82000000 ${loadaddress} 0x300000
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Step-3: Set BOOTSEL pin to select NAND boot, and POR the device.
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The device should boot from images flashed on NAND device.
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NOR
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===
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