[U-Boot] SAMA5D2 xplained SD/eMMC boot

[Andreas Bießmann]

Hi Marek,

On 2016-04-18 17:30, Marek Vasut wrote:
> Hi!
> 
> I've been playing around with latest mainline u-boot on sama5d2 
> xplained
> ultra. I noticed that if I want to boot the board from
> SD card (SDHCI1), the board will indeed load the SPL from it, but
> SPL will try to load u-boot.img from eMMC (SDHCI0) and fail, as
> my eMMC is blank. This is a result of hard-coding boot device to
> BOOT_DEVICE_MMC1 in arch/arm/mach-at91/spl.c spl_boot_device() I
> think.
> 
> Is there any way to discern from which SDHCI the board booted to
> continue loading u-boot.img from the correct one ? This would let
> us implement board_boot_order() and boot from correct SDHCI.

AFIAK it is not possible to detect the boot medium in a running device. 
At least was this the case when I checked it the last time (for 
sama5d3).

Andreas