I just received some Radxa CM3 modules. I was able to burn the image from https://wiki.radxa.com/Rock3/downloads and successfully boot using the radxa IO board. We then modified the /boot/uEnv.txt to use rk3566-radxa-cm3-rpi-cm4-io.dtb. and tried running the sd card on the CM4 IO. We get no sign of life except a red LED on the IO board. Additionally the CM3 boots on the radxa IO with this change also.
Our CM3 has EMMC, is that an issue with the RPI CM4 IO board?
Any help is appreciated