[coreboot] Intel G41 - Asrock G41M-GS: no coreboot screen output from Intel GPU on VGA

[h42 at memeware.net]

Would be great if someone could help to get libgfxinit working.

On 2018-09-01 21:13, h42 at memeware.net wrote:
> Cherry picking did not worked for me. I cloned coreboot today on an
> new linux installation.
> So i did additional:
> $ cd 3rdparty/libgfxinit/
> $ git checkout master
> $ cd -
> $ git add 3rdparty/libgfxinit/
> 
> Then i build the buildroot and the coreboot image.
> I think i should have the patch (and some other things that was merged
> in between) now inside the image. But i still dont have any seabios
> output on the screen. I am using seabios master.
> 
> Then i tried out linear (high resolution) framebuffer.
> I got that when building:
> ...
>     CC         ramstage/drivers/intel/wifi/wifi.o
>     GCC        ramstage/drivers/intel/gma/hires_fb/gma.o
> gma.adb:78:59: expected type "Interfaces.Integer_16"
> gma.adb:78:59: found type "Interfaces.Integer_32"
> gma.adb:79:59: expected type "Interfaces.Integer_16"
> gma.adb:79:59: found type "Interfaces.Integer_32"
> Makefile:338: recipe for target
> 'build/ramstage/drivers/intel/gma/hires_fb/gma.o' failed
> make: *** [build/ramstage/drivers/intel/gma/hires_fb/gma.o] Error 1
> 
> 
> On 2018-08-23 18:11, Nico Huber wrote:
>> Hello H42,
>> 
>> there is an issue with upscaling VGA text mode on G4x that is about to
>> be fixed [1]. Looking at your logs again, you are likely also affected
>> (scaling 640x400 to 1920x1080). The fix is already merged to the lib-
>> gfxinit repository, but the submodule pointer in coreboot is not 
>> updated
>> yet. You can try the fix as follows:
>> 
>>   $ cd 3rdparty/libgfxinit/
>>   $ git fetch https://review.coreboot.org/libgfxinit 
>> refs/changes/55/28255/3
>>   $ git cherry-pick FETCH_HEAD
>>   $ cd -
>>   $ git add 3rdparty/libgfxinit/
>> 
>> Then rebuild your coreboot.
>> 
>> Hope that fixes your issue. Another workaround would be to use a 
>> linear
>> framebuffer instead of text mode (CONFIG_GENERIC_LINEAR_FRAMEBUFFER).
>> 
>> Nico
>> 
>> [1] https://review.coreboot.org/28255