Comment # 43 on bug 108521 from Alex Deucher

(In reply to Dimitar Atanasov from comment #41)
> Created attachment 143805 [details]
> default boot vega 56

Similar issues on your system:
[  168.653171] pci 0000:3d:00.0: BAR 0: no space for [mem size 0x00004000]
[  168.653176] pci 0000:3d:00.0: BAR 0: failed to assign [mem size 0x00004000]