Don't do that!
Today I learnt this: Do NOT use ext4 for the /boot partition, where your
kernel resides.
I did this on my EEEPC to speed up boot, and today I got at boot the error
message: initrd.img corrupt. My EEEPC has got an ssd inside and /usr, /home
and /var are encrypted partitions.
It took me hours and hours to fix this. First I tried ext2fs, with no success.
I could run Trinity Rescue Kit from a sd card, and I created a chroot, but not
all was possible to do in the chroot.
After lots of tries I got the solution:
1. I backuped all the content of /boot to another drive.
2. Booted with a livefile and formatted /boot to ext2.
3. Restored /boot
4. Edited /etc/fstab, removed the UUID of /boot and removed disacard,noatime
5. Now I could boot again.
6. From the running system started "update-initramfs -u"
7. Did "dpkg-reconfigure linux-base", so I got the UUID in all necessary config
files again.
8. For making all sure. did "update-grub"
9. Finally test, rebooted again, everything was ok.
So NEVER, NEVER, NEVER use ext4 for /boot! Don't do it!
(If I would have read the manual, I should have known, ext4 and grub is still
in experimental state)
Best regards
Hans
Reply to: