Today I learned that someone ported a minimal version of AmigaOS to a custom DSP board built around the 68302 chip. See http://a1bert.kapsi.fi/BOAR/
I recall saying, a few days ago, that all you need to make a viable operating system is a port of exec.library and dos.library. I'm happy to see that I was right, and that prior art exists as proof.
BOAR does not include graphics.library, intuition.library, or other components of AmigaOS. But, that's fine if all you run is command-line tools.