I tried upgrading a machine from 1.6.2 to -current.  I built everything 
from the 21 March source, burned an ISO, and went through the upgrade 
procedure via sysinst.  The machine will no longer boot...

More precisely, when I try to boot the machine, it displays the old

	F1	DOS
	F2	NetBSD

prompt.  The very next thing I see is the start of the hardware reboot 
screens (i386).  I opted for the default option re a new MBR record.  

After the failure, I rebooted the installation CD and went through the 
installboot procedure again, even though it looks like it was done 
correctly.  More precisely, I did

	mount /dev/sd0a /mnt
	cp /usr/mdec/boot /mnt/boot
	installboot -v /dev/sd0a /usr/mdec/bootxx_ffsv1

No joy.


		--Steve Bellovin, http://www.research.att.com/~smb