bootloader problem since i update from 12.1 to 12.2 zfs
reddit / freebsd

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kristoferus · 2021-02-09 12:54

Hi !

After upgrade 12.1 to 12.2

i get an error because of zfs -> so i need to update zfs but after
that i need to set this (zfs mirror):

`gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 da0`

`gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 da1`

But now after reboot of the server it wont boot i dont know but i
thing after i set to legacy boot the server boots again :-( How can i
set it back to UEFI boot ?

What i did wrong ?

thanks

`# gpart show`

`=> 40 468862048 da0 GPT (224G)`

`40 409600 1 efi (200M)`

`409640 1024 2 freebsd-boot (512K)`

`410664 984 - free - (492K)`

`411648 8388608 3 freebsd-swap (4.0G)`

`8800256 460060672 4 freebsd-zfs (219G)`

`468860928 1160 - free - (580K)`

​

`=> 40 468862048 da1 GPT (224G)`

`40 409600 1 efi (200M)`

`409640 1024 2 freebsd-boot (512K)`

`410664 984 - free - (492K)`

`411648 8388608 3 freebsd-swap (4.0G)`

`8800256 460060672 4 freebsd-zfs (219G)`

`468860928 1160 - free - (580K)`

​

Is this correct in my case to fix it:

`gpart bootcode -p /boot/boot1.efifat -i 1 ada0`

`gpart bootcode -p /boot/boot1.efifat -i 1 ada1`

`gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 2 ada0`

`gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 2 ada1`

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[deleted] · 2021-02-09 14:34

[deleted]

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dddddavidddd · 2021-02-09 17:08

I once did something like this. To fix it, I booted from an installer
USB and copied over its EFI partition to recreate / repair mine.

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_jo_ku · 2021-02-10 11:56

The problem is that you wrote the protective MBR (relevant for BIOS
boot) to the rootsector of your disk with this command `gpart bootcode
-b /boot/pmbr -p /boot/gptzfsboot -i 1 da0`, but you actually want to
start your machine in UEFI mode.

To update your bootloader on the ESP (UEFI) you can use this command
(`gparted show` says your disk is `da0` and `efi` is located on sector
`1`):
```
gpart bootcode -p /boot/boot1.efifat -i 1 da0
```

Note: It's sufficient to run the command on `da0` only. As you use a
zfs-mirror, your data will be mirrored anyway.

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kristoferus · 2021-02-11 09:42

thanks !