Could not find the root block device in UUID=........

[NeddySeagoon]

beetterfly,

Just change the kernel line in grub.cfg so that root points to the other mmc card.
You have root=/dev/mmcblk0p2 which looks correct.
Try root=/dev/mmcblk1p2 instead.

The drive or entire card is the /dev/mmcblk0, /dev/mmcblk1, ...
What comes after the numeral is the partition. You have partitions called rpmb, boot0, boot1 all on /dev/mmcblk0.
Well, parted thinks you do.

Much like /dev/sda, /dev/sdb ... refers to a whole drive and the partitions are numbered.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

[beetterfly]

I tried, same result. even with your binary kerne, even with rootdelay=10l.
i'm gettin crazy