[U-Boot] SAMA5D2 xplained SD/eMMC boot

[Marek Vasut]

On 04/19/2016 05:22 AM, Yang, Wenyou wrote:
> Hi Marek,
> 
>> -----Original Message-----
>> From: Marek Vasut [mailto:marek.vasut at gmail.com]
>> Sent: 2016年4月18日 23:30
>> To: Yang, Wenyou <Wenyou.Yang at atmel.com>
>> Cc: u-boot at lists.denx.de
>> Subject: SAMA5D2 xplained SD/eMMC boot
>>
>> 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. 
> 
> Yes, there is some issue to load u-boot.img. I found there is something to do on sdhci.c.
> 
> You can try this branch, it should works.
> 
> https://github.com/linux4sam/u-boot-at91/commits/u-boot-2016.03-at91

I am not interested in using non-mainline stuff. Do you have any
particular patch/commit which I can refer to ? I do not think this
has anything to do with sdhci.c driver at all, it has to do with
detecting the boot device from which SPL was started and loading
u-boot.img from the same boot device instead of always using SDHCI0.

>> 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.
>>
>> --
>> Best regards,
>> Marek Vasut
> 
> 
> Best Regards,
> Wenyou Yang
> 


-- 
Best regards,
Marek Vasut