I've finally got my Beocreate board running, with a Raspberry Pi 4 running Raspberry Pi OS. I'm using the beocreate-universal-10.xml configuration. It was a bit of a fight. The first time setting everything up, at some point, I got a lot of weird sounds on the speakers, when changing xml files. But now, it just works.
The only thing I can't get to work is the optical input. I've looked through the xml file a bit, and I see a bunch of SPDIF settings, but none for Toslink/Optical. Is there a way to get this to work? Ideally without resorting to changing settings by HifiBerry OS.