My u60 does this with a 36g root drive, afaict.  eeh suggested to me
that it was firmware bug.  I never did bother to determine whether it was
associated with the size of the disk or perhaps the size of /.

Sat, Nov 06, 2004 at 12:37:54PM -0800, Michael Wolfson:
> BTW, does anyone know why my system won't autoboot?  It almost always 
> gives me a "Trap 3e" right after a reset, but I can always boot from 
> the OF "ok" prompt.
> 
> ok boot disk -s
> Resetting ...
> 
> 
> Sun Ultra 30 UPA/PCI (UltraSPARC-II 296MHz), No Keyboard
> OpenBoot 3.27, 256 MB memory installed, Serial #9596638.
> Ethernet address 8:0:20:92:6e:de, Host ID: 80926ede.
> 
> 
> Rebooting with command: boot disk -s
> Boot device: /pci@1f,4000/scsi@3/disk@0,0  File and args: -s
> Trap 3e
> ok boot disk -s
> Boot device: /pci@1f,4000/scsi@3/disk@0,0  File and args: -s
> NetBSD IEEE 1275 Bootblock
> >> NetBSD/sparc64 OpenFirmware Boot, Revision 1.8
> >> (mw@, Sat Oct 16 05:06:39 PDT 2004)
> 
>   -- MW