Hi @yeclek, welcome to the forum 
We don’t have a list of compatible boards because the software is still in a Beta phase, and to start with we’re focusing on supporting and testing on the RPi 3B (which is in our existing vehicles) and RPi 4B (which is a clear improvement within the same ecosystem). That said, in theory we expect it to run on RPi 3B and above, and it’s designed to be possible to port to alternative boards (including not Raspberry Pis) without significant hassle.
The idea is that as it gets tested on other boards (by us or others) then we can confirm that it works on them, and as it gets ported to alternatives we can provide instructions for how anyone interested can get that working. We plan to document the process for determining compatibility with or porting to a new board type, but testing and porting to other boards is not a priority for us at this stage, and likely won’t be until at least a little while after the stable release.
Not certain what you mean by this. We’ve tested both variants of the BCM chip on the RPi 4B without issues, but we haven’t tested on the CM4 (if that’s what you’re asking), and don’t know if that would work “out of the box” (without configuration) given it has different ports.