bogdal.grzeg...@tutanota.com:
> Hello,
> is there a known solution to my problem?
> After flashing the coreboot and booting the computer, I can use the 
> integrated GPU through VGA, but initialization of amdgpu fails and 
> DisplayPort external GPU isn't recognized by the system. It appears in lspci, 
> though.
> 
> I can provide better logs tommorow, but that's part of what appeared in dmesg:
> amdgpu get bioss error acpi vcft image header truncated
> amdgpu kernel bo map failed [...] error -22
> amdgpu_vram_scratch_init failed [...] error -22
> fatal error in GPU initialization
> 
> My specs:
> F2A85-M
> A10-6800k with integrated Radeon HD 8670D
> AMD RX 570 a external GPU
> I've used coreboot with Seabios
> 
> If there are some known solutions to the problem, please let me know. 
> Otherwise I could use a list of files and command outputs I should provide to 
> give better information. Thank you for your help.

Take a look at this thread
https://www.mail-archive.com/coreboot@coreboot.org/msg52644.html, and
the unofficial patches linked in
http://dangerousprototypes.com/docs/Lenovo_G505S_hacking#Discrete_GPU_support.
That vcft image header truncated message looks familiar.

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