[U-Boot] [PATCH 1/2] da850: Add instructions to copy AIS image to an MMC card

[Axel Haslam <ahaslam@baylibre.com>]

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 | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/board/davinci/da8xxevm/README.da850 b/board/davinci/da8xxevm/README.da850
index 313a1ef..e8fec3e 100644
--- a/board/davinci/da8xxevm/README.da850
+++ b/board/davinci/da8xxevm/README.da850
@@ -47,6 +47,22 @@ 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 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)
+
+To skip the first sector, the AIS image can then written using
+the following dd command:
+dd if=u-boot.ais of=/dev/mmcblk0 seek=1 bs=512 conv=fsync
+
+CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR is used by SPL, and should
+point to the sector were the u-boot image starts on the MMC card.
+(eg. after SPL).
 
 Recovery
 ========
-- 
2.9.3