as long as the EFI partition is large enough (which I assume Linux/grub
will create), installboot is supposed to install /boot/efi/openbsd/BOOTX64.EFI.
Nicely up to date, won't be stomped on by other bootloaders, etc.
I don't think you would even need to manually copy or edit that
partition.
On 2026 May 15 (Fri) at 12:31:34 -0700 (-0700), Heppler, J. Scott wrote:
:Re: GRUB is reported to usually fail.
:
:This is misleading at best.
:
:OpenBSD can easily and reliably be booted from Grub installed on a Debian,
:Debian Derivative or Arch Linux using Grub installed per the wiki.
:
:Essentially, the EFI partition is used in common with both Operating systems.
:
:The most time efficient way to install to a single disk is to install Linux
:first and manually partition:
:Partition1 = EFI
:Partition2 = Linux /
:Partition3 = Linux swap
:Partition4 = allocated to OpenBSD
:
:After the linux install, use the native partition manager in Linux, fdisk or
:gparted, to set Partition4 to type OpenBSD(data).
:
:Install OpenBSD to the OpenBSD area.
:
:Next boot back into Linux and download the OpenBSD "BOOTX64.EFi" file and
:install to /boot/efi/.
:
:Edit /etc/grub.d/40_custom to:
:
:#!/bin/sh
:exec tail -n +3 $0
:# This file provides an easy way to add custom menu entries. Simply type the
:# menu entries you want to add after this comment. Be careful not to change
:# the 'exec tail' line above.
:menuentry 'OpenBSD 7.8' {
: chainloader (hd0,gpt1)/BOOTX64.EFI
:}
:
:and run /sbin/update-grub.
:
:Your next boot should have a Grub menu entry for OpenBSD 7.8.
:
:Fedora/RedHat uses a conflicting /boot/efi/BOOTX64.EFI
:
:I'll work with the FAQ maintainers to correct.
:
:
:--
:J. Scott Heppler
:
