After an upgrade of raspbian I rebooted the system and it printed the following message:
"mounting /dev/mmcblk0p2 on /root failed: No such device"
After that an emergency shell (busybox) appeared. When I mounted the partition it worked without any problems. I changed the filesystem to vfat because I thought some kernel modules were missing, but it didn't help.
How can I debug this?
/dev/mmcblk0p2for years! Did you fiddle with