MMC+SD

Problem:
When having the same image on both a MMC and SD card, Linux can't differ between them.

Solution:
give the partitions new IDs
1. vfat
dd if=/dev/path_to_vfat of=/path_to_file bs=512 count=1			; dump the first 512 byte of the vfat into a file
shed /path_to_file													; hex edit ID at position 0x43-0x46
dd of=/dev/path_to_vfat if=/path_to_file bs=512 count=1			; write file back to vfat

2. ext4
uuidgen																; generate new UUID (or modify the old just a little bit)
tune2fs /dev/path_to_ext4 -U new_UUID

3. mount /dev/path_to_ext4  /mntpt								; mount ext4 to modify fstab
4. nano /mntpt/etc/fstab											; edit  file system IDs
5. umount /dev/path_to_ext4
6. mount /dev/path_to_vfat /mntpt
7. nano /mntpt/boot.ini												; change UUID to new ext4 UUID