On a -current/amd64 box which normally boots a raidframe softroot via bios, I added a disk, and attempted a uefi boot with it.
2048 524288 1 GPT part - EFI System 526336 2097152 2 GPT part - NetBSD FFSv1/FFSv2 I get a NetBSD EFI boot prompt. From there, a dev hd0b: ls gets device not configured, i.e., ENXIO, as does the raidframe dev hd1a:. I compiled boot64.efi with DEBUG_DISK, but didn't see any additional information. Possibly seeing PR 52959 ? Cheers, Patrick