I've actually been dealing with this myself recently, but only the gpu portion. I've been trying to get a gpu working on the orangepi RV2 just to see if I can. The tools for building the kernel for orangepi are kind of bad though.

But no, the 2 old amd gpus I have just don't show up at all in lspci, testing the RTX 2080 and RX 7800 both did show up though.