Thank you. I'll check it out and report sometime in September whether the 
patches helped my case.


Sep 8, 2019, 19:06 by [email protected]:

> [email protected]:
>
>> 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/[email protected]/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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