[U-Boot] SAMA5D2 xplained SD/eMMC boot

[Yang, Wenyou]

Hi Marek,

> -----Original Message-----
> From: Marek Vasut [mailto:marex at denx.de]
> Sent: 2016年4月20日 0:34
> To: Yang, Wenyou <Wenyou.Yang at atmel.com>
> Cc: u-boot at lists.denx.de
> Subject: Re: SAMA5D2 xplained SD/eMMC boot
> 
> 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.

I will test the mainline code. I will let you know when I get something.

Thank you.

> 
> >> 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


Best Regards,
Wenyou Yang