Perhaps this is related to something else but on my 2013 MacBook Air with an OpenBSD-only EFI install, boot fails to attempt booting from hd0a:/bsd but instead tries fd0a:/bsd several times. I tried adding /etc/boot.conf with boot hd0a:/bsd in both sd0i (the EFI boot partition) and sd0a. Is this something unique to Apple hardware or is this something that all (U)EFI installs have trouble with?
Bryan