Thanks all. Lots of talk about Raspberry Pi boards which is not a surprise. I'll try running it on my Pi5 at some point soon. I have it running on a Pi zero for some years now.
The PowerPC board for a notebook is interesting, but I'm not much of a developer. I'm reasonably good at opening bugs though, heh. I see some rambings here and there about Risc-V, PowerPC, MIPS. I'll dig through some of the evb* docs to see if I find something interesting as well. Andy