> >  I am highly confident that I don't have a hardware problem. It worked
> >  fine before the CS, and I replaced the clock battery a year or so ago.
> 
> Hm. Please check with AmigaOS, if you can, that there still is a valid date
> in the clock chip. If there is, please file a PR, including the kernel bootup
> messages (e.g. dmesg output).

 I will file a PR, the problem seems definitely NetBSD related.

 The SCSIPrefs tool under AmigaOS (probably from Aminet - it's not standard)
 gave me two warnings that both the shared UNIX/AmigaDOS and the AmigaDOS
 part of the battery backed-up clock had suffered 'Amnesia'. I fixed it,
 booted into AmigaOS several times (warm reboot and switching the machine
 off/on), and it seemed to be fine. Booted into NetBSD afirst time, which
 was fine. shutdown and booted into NetBSD again, and the warning was back.