[U-Boot] [PATCH] arm: mvebu: clearfog: document eMMC installation

[Stefan Roese]

On 25.03.19 08:09, Baruch Siach wrote:
> Document build and install of U-Boot image on Clearfog with eMMC.
> 
> Signed-off-by: Baruch Siach <baruch at tkos.co.il>
> ---
>   board/solidrun/clearfog/README | 23 +++++++++++++++++++++++
>   1 file changed, 23 insertions(+)
> 
> diff --git a/board/solidrun/clearfog/README b/board/solidrun/clearfog/README
> index a7bc0d4e23fb..0b0e98de90a0 100644
> --- a/board/solidrun/clearfog/README
> +++ b/board/solidrun/clearfog/README
> @@ -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:
>   ---------------
>   
> 

Nice, thanks for this documentation.

Reviewed-by: Stefan Roese <sr at denx.de>

Thanks,
Stefan