[Intel-gfx] i915 Skylake: "Invalid ROM contents"

[Alex Deucher]

On Wed, Nov 18, 2015 at 5:59 AM, Ville Syrjälä
<ville.syrjala at linux.intel.com> wrote:
> On Tue, Nov 17, 2015 at 11:43:25AM -0800, Andy Lutomirski wrote:
>> Typing:
>>
>> # cat /sys/devices/pci0000:00/0000:00:02.0/rom
>>
>> Provokes:
>>
>> i915 0000:00:02.0: Invalid ROM contents
>
> Hmm. So there's no PCI option ROM there. I wonder what is there. I
> get the same on my Braswell BTW. I tried to look through the UEFI
> spec a bit, and it seems to say that even for non-legacy option ROMs
> the 0x55aa signature should be there.
>
> But this being the GPU means we may be using the shadow ROM stuff,
> which IIRC assumes that the shadow is at 0xc000. I'm not sure that
> holds anymore with UEFI, and maybe we should be using some UEFI
> trick instead to find out where it actually lives?

We started getting the same message on radeon even though we are
eventually able to find the rom.  It was due to some core pci change
in the handling of roms, but I don't remember the details.

Alex

>
> BTW what does 'lspci -vv -s 00:02.0' say on your machine?
>
>>
>> This is on a Dell XPS 13 9350 (Skylake).  This is 4.3.0 plus some
>> wireless-next bits.
>>
>> --Andy
>>
>> --
>> Andy Lutomirski
>> AMA Capital Management, LLC
>> _______________________________________________
>> Intel-gfx mailing list
>> Intel-gfx at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> --
> Ville Syrjälä
> Intel OTC
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