I did, but is a missing card a guarantee that it is non-free?
I'm new to h-node and it leaves me with a lot of questions.

For instance, the RX 560 is in there, but not the RX 580.  Does it mean that the
RX 580 does not run at all on Linux-libre?  Or only 3D is missing?
Which part is proprietary?

-- 
Pierre Neidhardt
https://ambrevar.xyz/