I would use the latest but stable RPi firmware+kernel from RPiOS64. You can easily get that running the hackers way by using 'rpi-update' developer/engineering script or enhance your sources list and do apt pinning so you do not use Ubuntu kernel but the RPiOS64 one automatically. Or similar, take the Ubuntu kernel from Ubuntu 25. Or use Armbian Ubuntu with latest bleeding edge kernel, then all work is done for you already I think, although for CM5 I am not sure, for Pi3/4/5 it should work. Or else wait for people who know what HS400 is, I know it is 'high speed', likely something with 400MHz CLK, but no details. Maybe force lower speed.
Statistics: Posted by redvli — Sun Jun 08, 2025 11:05 am