cm4s is different from cm4, but they’re so hard to get that you’re mostly on your own
you’ll probably need a custom device tree overlay
@snipeytje is right you’ll need a custom DToverlay to get full function out of the CM4S, I don’t have one so I couldn’t test to add one into the kernel or image.
Thanks for the explanation, Rex, Shipeytje
2 Rex: If you would have time and desire to test and add dtoverlay for on-board Wi-Fi/BT module, I may send you CM4S as a present, in the sake of the science ( and a little bit of mine humble interest :)).
I’ve passed through almost all the posts here about CM4S, some guy purchased them and stuck with no solution available.