I had the same problem, you have to change the nick name /dev/blablabla to the real name meaning the uuid in the file /etc/fstab
Code:
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
#/dev/mmcblk0p2 / ext4 errors=remount-ro 0 1
UUID=5000bb00-3581-4f00-b858-dd4110f0a0bb / ext4 errors=remount-ro 0 1
# Change this if you add a swap partition or file
#/dev/SWAP none swap sw 0 0
#/dev/mmcblk0p1 /boot vfat noauto 0 0
UUID=2CBE-0EF0 /boot vfat noauto 0 0
blkid will give your the uuid that you need.
I think you sould ignore the error: Unsupported ioctl: cmd=0x5331
make an ssh key rename the public key to authorized_keys and copy it to /etc/dropper-initramfs