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arm: mvebu: clearfog: document eMMC installation

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Document build and install of U-Boot image on Clearfog with eMMC.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Baruch Siach 2019-03-25 09:09:00 +02:00 committed by Stefan Roese
parent b0b60972fa
commit 3ff0ad2e48
1 changed files with 23 additions and 0 deletions
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23
board/solidrun/clearfog/README
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@ -17,6 +17,29 @@ $ sudo dd if=u-boot-spl.kwb of=/dev/sdX bs=512 seek=1
Please use the correct device node for your setup instead
of "/dev/sdX" here!
Install U-Boot on eMMC:
-----------------------
The ROM loads the bootloader from eMMC first boot partition at offset 0. This
is unlike load from SD card that is at offset 512. As a result, the offset of
the main U-Boot image on the eMMC boot partition changes. Set
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR to 0x140 for SPL to load U-Boot from
the correct location.
To make SPL load the main U-Boot image from the eMMC boot partition enable
eMMC boot acknowledgement and boot partition with the following U-Boot
command:
mmc partconf 0 1 1 0
Install U-Boot on eMMC boot partition from Linux running on Clearfog:
echo 0 > /sys/block/mmcblk0boot0/force_ro
dd if=u-boot-spl.kwb of=/dev/mmcblk0boot0
Note that the SD card is not accessible when the Clearfog SOM has eMMC.
Consider initial boot from UART (see below).
Boot selection:
---------------