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

[Nico Huber]

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