UEFI on OpenBSD

After tons of hardwork a group of dedicated hackers have finally put out a UEFI boot loader for OpenBSD. While the installer does not yet deal with EFI boot blocks they are easily installed manually.

• So to manually install it you will have to start with enabling UEFI mode in your firmware setup screen (BIOS Setup screen)
• With the latest snapshot written to a flash drive boot the flash drive in UEFI mode to see if it will work for you.
• if it worked for you congratulations now you want to set up your partitions: fdisk -i sd0

• if you want to use softraid here is where you would set the disk labels for that: printf “a\n\n\n\nRAID\nw\nq\n”

  disklabel -E sd0

• do the softraid setup: bioctl -c C -l /dev/sd0a
• Setup the UEFI partition
  • format the partition: newfs_msdos /dev/sd0i
  • mount the EFI part: /mnt/efi
  • Make the EFI directory structure: mkdir /mnt/efi/EFI;mkdir /mnt/efi/EFI/BOOT
  • copy BOOTX64.EFI and BOOTIA32.EFI to /mnt/efi/EFI/BOOT
• Proceed with the OpenBSD install using the OpenBSD install script, from here the script will do everything else right and provide you with a disk that can be booted under MBR and the work you just finished will let it boot under UEFI.

A big thanks goes out to Toby Slight, I adapted the instructions from what he posted on misc@