[U-Boot] mx6cuboxi fails to load u-boot.img

[Baruch Siach]

Hi Adam,

Thanks Vagrant and Jonathan for the report and investigation.

On Fri, Sep 27 2019, Adam Ford wrote:
> On Fri, Sep 27, 2019 at 4:38 AM Jonathan Gray <jsg at jsg.id.au> wrote:
>> On Thu, Sep 26, 2019 at 05:07:21PM -0300, Fabio Estevam wrote:
>> > Hi Vagrant,
>> >
>> > On Thu, Sep 26, 2019 at 4:16 PM Vagrant Cascadian <vagrant at debian.org> wrote:
>> > >
>> > > I just tested mx6cuboxi with 2019.10-rc4, and it fails to load
>> > > u-boot.img from MMC:
>> > >
>> > > 1 2019-09-26_17:31:27.63089 U-Boot SPL 2019.10-rc4+dfsg-1 (Sep 24 2019 -
>> > > 08:03:23 +0000)
>> > > 2 2019-09-26_17:31:27.63092 Trying to boot from MMC2
>> > > 3 2019-09-26_17:31:27.63095 MMC Device 1 not found
>> > > 4 2019-09-26_17:31:27.63097 spl: could not find mmc device 1. error: -19
>> > > 5 2019-09-26_17:31:27.63099 SPL: failed to boot from all boot devices
>> > > 6 2019-09-26_17:31:27.63101 ### ERROR ### Please RESET the board ###
>> >
>> > Thanks for reporting this issue.
>> >
>> > Unfortunately, I don't have access to my Cuboxi, so I am adding Jon
>> > and Baruch on Cc.
>>
>> Works after reverting the following commit.
>>
> I am going to argue that making the board comply with DM_MMC is why I
> needed to make the patch, because when booting from MMC2, the function
> was returning MMC1 which was clearly not the boot source.
>
> If the boards that fail accept MMC2 as a response when booting from
> MMC2, that seems like a bug on the indvidual boards.  Instead they
> should setup their boot sequence to configure MMC2 when MMC2 is the
> boot source.  Instead, it seems like some boards are configuring MMC1
> with MMC2 info which only prolongs the conversion to DM_MMC.
>
> If we revert the patch, then boards like imx6_logic who rely solely on
> device tree and DM_MMC for booting will have to manually override the
> MMC driver in order to boot from MMC2, and that seems like a step
> backwards.  I would argue that this board should migrate to DM_MMC and
> use the device tree to boot, and the problem should go away.

I'll try to migrate Cubox-i/Hummingboard to DM and OF_CONTORL as you
suggest.

Is there a way to make a DT based U-Boot i.MX6 image work on both
Quad/Dual and DualLite/Solo?

The kernel provide separate DTs for Quad/Dual and DualLite/Solo. What is
the right course in U-Boot? Run time DT detection?

Thanks,
baruch

--
     http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
   - baruch at tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -