Failed to boot : Must be superuser to use mount

Hi @amnj86,

You did not mention which Yocto version you are building.

For reference, you could try Raspberry Pi 4 Model B - #2.

Furthermore, when I list the files in the rootfs, everything is owned by uid 1000, including

This is very strange and could explain the problems you are having.

Do you post-process the rootfs image after the Yocto build in any way?