Hi Wolfgang,
Thank you for your suggestions. The actual thing that did the trick was setting the display framebuffer graphics resolution to something (e.g. 1024x768 64k, some other combinations also work). I think the other settings (e.g. VGA BIOS) were already set by setting the board (amd ft3b-lc).
At this point though I have another problem. I have set GRUB2 as payload (2.02 beta3, latest version HEAD) and it appears that the console buffer and/or video buffer have an overflow problem - when I fill up the screen i.e. big output (or progressive newline output) GRUB restarts.
Problem is any command I run will most likely fill up the screen and GRUB will restart. I suspect that even booting Linux determines GRUB to restart because of this.
1. Is this a known issue ? (overflow on GRUB cli screen) 2. Could I avoid not getting screen outputs from GRUB ? 3. Can Coreboot give me info on the GRUB crash on the display ? (being it is the only way to interact)
Thank you, Grigore