Boot stops on RPi4 yocto/hardknott (u-boot 2021.01)

Hi,

I'm working on a project where we recently upgraded to Yocto/hardknott.

After the upgrade to U-Boot 2021.01 the boot stops at

switch to partitions #0, OK mmc0 is current device Scanning mmc 0:1...

and then nothing more happens. Sometimes resetting power will cause the RPi4 to boot - but not always.

I then downgraded to U-Boot 2020.07 and the RPi4 boots every time.

I will be looking at the commits between 2020.07 and 2021.01 - but I'm not really sure what to look for - any ideas?

Best regards Morten