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da850: Add instructions to copy AIS image to an MMC card

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The da850 soc's can boot from a external mmc card, but
the AIS image should be written to the correct sector.

Add instructions to copy the AIS image to a MMC card.

Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
ahaslam@baylibre.com 2017-02-13 18:49:40 +01:00 committed by Tom Rini
parent 7a2af751a0
commit 4aac44be11
1 changed files with 23 additions and 0 deletions
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23
board/davinci/da8xxevm/README.da850
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@ -47,6 +47,29 @@ U-Boot > sf erase 0 +320000
U-Boot > tftp u-boot.ais
U-Boot > sf write c0700000 0 $filesize
Flashing the images to MMC
==========================
If the boot pins are set to boot from mmc, the RBL will try to load the
next boot stage form the first couple of sectors of an external mmc card.
As sector 0 is usually used for storing the partition information, the
AIS image should be written at least after the first sector, but before the
first partition begins. (e.g: make sure to leave at least 500KB of unallocated
space at the start of the mmc when creating the partitions)
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR is used by SPL, and should
point to the sector were the u-boot image is located. (eg. After SPL)
There are 2 ways to copy the AIS image to the mmc card:
1 - Using the TI tool "uflash"
$ uflash -d /dev/mmcblk0 -b ./u-boot.ais -p OMAPL138 -vv
2 - using the "dd" command
$ dd if=u-boot.ais of=/dev/mmcblk0 seek=117 bs=512 conv=fsync
uflash writes the AIS image at offset 117. For compatibility with uflash,
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR is set to take into account this
offset, and the dd command is adjusted accordingly.
Recovery
========