AMD Chromebooks with upstream coreboot: non-working iGPU

[Paul Menzel]

Dear coreboot folks,

In #[e-mail] there is a report, that self-built coreboot 
won’t work on AMD Chromebooks. The problem seems to be that you need a 
verstage signed by Google/AMD. Otherwise the GPU driver breaks.

Is that expected/known? If not, does somebody have instructions how to 
build a coreboot image from upstream coreboot.

Kind regards,

Paul

[Matt DeVillier]

hi Paul,

This is a known issue for google/zork based (Picasso/Dali SoC) boards. I've
raised a bug internally and Martin and I are trying to wrangle someone from
the PSP team to get this sorted.

google/kahlee (Stoneyridge) should not have this issue. google/guybrush
(Cezanne) I'm not sure, need to check. google/skyrim does not require any
verstage (though the blobs in amd_blobs need updating, which I plan to have
done before Mendocino Chromebooks are available via retail)

regards,
Matt

On Tue, May 16, 2023 at 9:11 AM Paul Menzel  wrote:
> Dear coreboot folks,
>
> In #[e-mail] there is a report, that self-built coreboot
> won’t work on AMD Chromebooks. The problem seems to be that you need a
> verstage signed by Google/AMD. Otherwise the GPU driver breaks.
>
> Is that expected/known? If not, does somebody have instructions how to
> build a coreboot image from upstream coreboot.
>
> Kind regards,
>
> Paul
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