I found the page in the FAQ that described installboot and making
a disk bootable.  I tried it and it didn't work - at first...

What I did:

(boot from floppy)
mount /dev/sd0g /usr
mount /dev/sd0a /mnt
cp /usr/mdec/ofwboot /mnt/boot
/usr/mdec/installboot /mnt/boot /usr/mdec/bootxx /dev/rsd0a
reboot

	(no joy - DEFAULT CATACH...)

(boot from floppy)
mount /dev/sd0a /mnt
			# note no mount of /dev/sd0g /usr
cp /usr/mdec/ofwboot /mnt/boot
/usr/mdec/installboot /mnt/boot /usr/mdec/bootxx /dev/rsd0a
reboot

	(no joy - DEFAULT CATACH...)

(boot from floppy)
mount /dev/sd0a /mnt
			# note no mount of /dev/sd0g /usr
cp /usr/mdec/ofwboot /mnt/boot
/usr/mdec/installboot -v /mnt/boot /usr/mdec/bootxx /dev/rsd0a
sync
sync
sync
reboot

	(works now)

What did it?  sync? -v?  Is there some reason the /usr/mdec
from the mounted /usr should not work, where the one from the
/usr on the floppy should?

-dgl-

>I have a specific need to restore a machine from tape, and then
>be able to use it.  When I restore the root partition, and
>then try to boot, it doesn't work.
>
>I recall a command installboot(8), but it has no man page on macppc.
>Is this the mechanism to restore this partition to bootability?
>Why does restoring the filesystem cause me to get OF errors?
>(DEFAULT CATCH code BLAHBLAH)
>
>I thought that the bootloader resided in "special" partitions not
>visible to the normal tools.
>
>I'm OF 1.0.5, Pmac 7600, NetBSD 1.5 and boot command (that works after
>a real install) is boot scsi-int/sd@0:0
>
>I did not do the newfs that restore(8) suggests, but only a "rm -rf"
>on the FS.
>
>Do tell.
>
>Thanks,
>
>-dgl-