Mostly FYI, but if anyone has any explaination that would be cool.

I upgraded my gateway box from 1.5 to 1.6 over the weekend.
Its a sparc/Classic.  In an effort to minimized downtime, I pre-build
the needed packages and custom kernel on an SS20 (also
running 1.6).  The Classic came up ok and all was well, but when 
I booted it with the custom kernel I got:

Boot device: /iommu/sbus/espdma@4,8400000/esp@4,8800000/
sd@3,0   File and args: netbsd.n -s
>> NetBSD/sparc Secondary Boot, Revision 1.12
>> (autobuild@tgm.daemon.org, Mon Sep  9 08:12:32 UTC 2002)
Booting netbsd.n
4477624Data Access Exception
ok boot netbsd
Resetting ... 

having replaced the bootblocks, I re-built the kernel after
removing the following from /etc/mk.conf

DBG= -O1 
COPTS+= -mcpu=v8

without these the kernel loaded fine.  

BTW pkgsrc/devel/cpuflags/files/cpuflags.NetBSD suggests -msupersparc
for both the Classic and SS20 btw.  I've not tried that yet.
Nor have I tested whether it was -O1 or -mcpu=v8 causing the problem.

Thanks
--sjg