Thanks. I went to look at bcm2712-rpi-5-b.dts and bcm2712.dtsi in 6.12.x, as it's been a while since I last checked, but it looks like even 14 months after the RPi5, they've still got no further with upstreaming than serial support. No USB, no graphics... possibly SD card working?

They used to be alright (if not stellar) at Linux support so the story with RPi5 has been really disappointing. Hard to choose CM5 for a product when it's stuck in a downstream quagmire.