Loose EFI partition
Last time I had to reboot my laptop, it wouldn’t… Annoying isn’t it?
Whats wrong? I checked to boot device in the UEFI, it was correct. Hum… it does
not smell good. I had no fear for the data, I have more than 3 different
backups of my home, and the configuration files (
reinstallation and restoring take a loooong time. I need a better and faster
So I checked on my usb key a FreeBSD one. And… I found it. Hurray \o/
Booting on the USB key
Not a big deal, just plug the USB key on the laptop and boot. When the install process start, I choose to have a shell.
Read the gpart of the internal disk
In fact it’s not a disk but a ssd. The process remain the same.
gpart show nvd0 => 40 1953525088 nvd0 GPT (932G) 40 409600 1 efi (200M) 409640 1024 2 freebsd-boot (512K) 410664 984 - free - (492K) 411648 16777216 3 freebsd-swap (8.0G) 17188864 1936334848 4 freebsd-zfs (923G) 1953523712 1416 - free - (708K)
Ok the EFI partition is the number 1 (
Mounting the EIF partition
On the Internet I found many tutorial that want me to mount
First, UBS Key filesystem is read-only. I cannot mount anything on
Well, the only writable filesystem was…
/tmp. So I made a folder in
and try again to mount the
nvd0p1 partition… Once again without success :-(
fdisk told me that it’s a
fat partition… But it seems it was to damaged to
A risk solution
SO, what to do? The consulted website gave me a way, with the links referenced on the bottom.2
The small exercice on this page will help me.
Make a new filesystem
What’s on the EFI partition? I don’t know and I don’t have a way to know it. What’s the risk to loose this partition? Nothing I can’t even boot the laptop. The worst situation could be to reinstall the system.
After those thinking I decided to put a correct filesystem on the EFI partition:
newfs_msdos -F 32 -c 1 /dev/nvd0p1
Then I can mount it on
/tmp/efi and copy the boot kernel from the USB-key to
mount -t msdosfs /dev/nvd0p1 /tmp/efi mkdir -p /tmp/efi/EFI/BOOT cp /boot/loader.efi /mnt/efi/EFI/BOOT/BOOTX64.efi umount /tmp/efi
Time to reboot and see if it’s ok.
Just after the UEFI laptop part (Lenovo logo),
geli ask me for the crypt
passphrase… And the OS boot.
With the help of those two websites and a little part of my brain, I surely gain a lot of restoration time. To have more inforations about the boot process of FreeBSD, look at the handbook, chapter 13