Re: About zfs upgrade

On 16 Jul 2022, at 18:09, Nuno Teixeira <eduardo@freebsd.org> wrote:
> I'm about to upgrade zfs pool and I need to know the command to update boot code on my efi config:
> ---
>  gpart show
> =>        40  2000409184  nvd0  GPT  (954G)
>           40      532480     1  efi  (260M)
>       532520        2008        - free -  (1.0M)
>       534528     8388608     2  freebsd-swap  (4.0G)
>      8923136  1991485440     3  freebsd-zfs  (950G)
>   2000408576         648        - free -  (324K)
> ---
> Handbook says:
> gpart bootcode -p /boot/boot1.efifat -i 1 ada1
> 
> Should I use:
> gpart bootcode -p /boot/boot1.efifat -i 1 nvd0p1 ?

For gpart, you should specify the base device, i.e. nvd0. The "-i 1" option indicates the partition.

In any case, assuming FreeBSD 13 or later, you can just mount the EFI partition and copy loader.efi over:

mount -t msdosfs /dev/nvd0p1 /mnt
cp /mnt/efi/boot/bootx64.efi /mnt/efi/boot/bootx64.old
cp /boot/loader.efi /mnt/efi/boot/bootx64.efi

That way you could also revert to bootx64.old if things go wrong.

-Dimitry