Nice -- does anyone one know if this applies to the Steam Deck? Maybe not a game changer, but certainly a neat thing for us to play around with. (I also have a 4gb RX 570, but I'm fairly certain the Steam Deck is better, yes?)
I would expect ROCm to work just fine with with Steam Deck. Given that the Steam Deck apparently uses gfx1033. So you probably need to specify the environment variable HSA_OVERRIDE_GFX_VERSION=10.3.0 and corresponding gfx1030_20.ukdb miopen kernel. I do not own a Steam Deck, but I do have another RDNA2 card, an RX 6700XT, which uses the similar gfx1031 ISA, which works just fine. While I don't have a RX 570, I do have a RX 480 which is also gfx803 like your RX 570 which should technically work, however don't expect much in performance or capability, as most work loads expect more than your 4GB of vram and much more compute power. You will also would need to use older versions of ROCm as well as these older cards are deprecated; I think I had to use ROCm <=4.3.1 if I remember correctly. What did you want to run specifically?