> > bootxx_fs is right; also, make sure you copy /usr/mdec/boot.amiga to /, as
> > this is part of the two stage booter.
>
> Just tried that, but the filesystem is mounted as read-only...

If you can get NetBSD booted using the miniroot, then you should be able
to do this:

mount /dev/sd0a /mnt          (or whatever your root partition is)
(only if /usr is a different partition)
mount /dev/sd0e /mnt/usr      (whatever usr is)

Then:
cp /mnt/usr/mdec/boot.amiga /mnt

John