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----
-title: dualboot linux and openbsd with grub
-date: 2021-11-03T15:23:00+03:00
-author: la-ninpre
-tags: openbsd linux grub tutorial
----
-
-i've been trying to dualboot openbsd with linux using grub on both bios and
-uefi machines and here's a solution that i've come up with.
-
-<!--more-->
-
-there are some guides about this on the internet, but there's no single guide
-that covers both bios and uefi. @rootbsd has a video where he shows how to
-do this, but his solution has one little disadvantage. he's specifying drives
-in a grub config using relative drive and partition numbers, such as
-`(hd0,gpt2)`. since these numbers could be different if one inserts a new drive
-to the computer, or changes drive order, the boot option could fail
-(which happened).
-
-all partitions and drives have their unique identifier -- uuid. there's no
-direct way to specify uuid in grub configuration, but there is a workaround.
-
-grub manual describes the `search` command which has an option to set root
-device if it is found. so we can use it for our purposes.
-
-## steps for dualbooting in bios/legacy mode
-
-1. install linux system on one of your drives
-
-2. reboot and boot from openbsd install media and install openbsd to other drive
-or partition.
-
-3. reboot and login to your linux system
-
-4. open a terminal and run `blkid` or `lsblk -f` to get an output partition
-uuids.
-
-5. write the following at the bottom of `/etc/grub.d/40_custom`:
-
-  ```
-  menuentry 'OpenBSD' {
-      search -su --no-floppy *UUID*
-      chainloader +1
-  }
-  ```
-
-  where *UUID* is the uuid of your openbsd partition (with type 'ufs2')
-
-6. run either `update-grub` or `grub-mkconfig` depending on what distribution
-you are using. consult your distro's wiki to find a way to update your grub
-configuration with recent changes.
-
-7. now reboot and you should see an openbsd's boot option in grub menu.
-
-## steps for uefi system
-
-for boot in uefi mode there are few differences. after installing openbsd
-don't reboot, but choose **shell**. now cd into `/mnt` directory and
-download `BOOTX64.EFI` from your desired openbsd mirror. for example:
-  ```
-  # cd /mnt
-  # ftp https://cdn.openbsd.org/pub/OpenBSD/7.0/amd64/BOOTX64.EFI
-  # reboot
-  ```
-
-after that the only other difference is that `chainloader` directive should
-be `chainloader /BOOTX64.EFI`.
-
-all other steps are the same.