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 --- board/davinci/da8xxevm/README.da850 | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/board/davinci/da8xxevm/README.da850 b/board/davinci/da8xxevm/README.da850 index 313a1ef..29cb4ec 100644 --- a/board/davinci/da8xxevm/README.da850 +++ b/board/davinci/da8xxevm/README.da850 @@ -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 ========