On Mon, Sep 21, 2026 at 09:45:53AM +0200, Janne Johansson wrote: > (like pxe and cdboot both loading a 1.44MB image into ram and then > doing floppy-boot on it)
Actually, OpenBSD does not need floppy emulation for optical media booting. El-Torito does include such a mode of operation, but the regular methods of creating a bootable OpenBSD optical disc use 'no-emulation' mode, which just defines an arbitrary chunk of data to be read by the firmware and used to boot the system. BIOS booting loads and runs the data as code in real mode, basically equivalent to executing the mbr of a hard disk. UFEI booting loads the data and interprets it as a FAT filesystem, but it is not a 1.44Mb floppy image. Whilst you _could_ use the other El-Torito defined modes, (floppy emulation and hard disk emulation), to boot an OpenBSD system, this is not a standard configuration.
