It got pretty far!

chain: calling OF_chain(800000, ef18, 1000000, fffa3a80, 18)
[ using 376144 bytes of netbsd ELF symbol table ]
pmap_bootstrap: could not claim physical dseg extention at 3cba000 size 346000
Setting DTLB entry 00000000 01000000 data e0000000 03800076
Setting DTLB entry 00000000 01400000 data e0000000 03000076
Setting ITLB entry 00000000 01000000 data e0000000 03000076
Setting TSB pointer 00000000 014ca000
consinit()
setting up stdin
stdin instance = fff91c28
setting up stdout
stdout instance = fff91958
stdout package = f006b984
console is unknown
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 1.5Q (GENERIC) #12: Sun Jan 14 10:54:27 PST 2001
    eeh@nonplus.netbsd.org:/home4/src/sys/arch/sparc64/compile/GENERIC
total memory = 65536 KB
avail memory = 51560 KB
using 422 buffers containing 3376 KB of memory
bootpath: /pci@1f,0/pci@1,1/network@1,1
mainbus0 (root): SUNW,UltraSPARC-IIi-cEngine
cpu0 at mainbus0: SUNW,UltraSPARC-IIi @ 333.014 MHz, version 0 FPU
cpu0: physical 4K instruction (32 b/l), 4K data (32 b/l), 2048K external (64 b/l) 
psycho0 at mainbus0 addr 0xfffc0000
abre: bus range 0 to 3; simba b, PCI bus 1; simba a, PCI bus 2
DVMA map: c0002000 to ffffe000
pci0 at psycho0
pci0: i/o space, memory space enabled
Sun Microsystems product 0x2000 (miscellaneous prehistoric) at pci0 dev 0 function 0 not configured
simba0 at pci0 dev 1 function 0: Sun Microsystems Simba PCI bridge (rev. 0x11)
pci1 at simba0 bus 2
pci1: i/o space, memory space enabled
Digital Equipment DECchip 21150 PCI-PCI Bridge (PCI bridge, revision 0x04) at pci1 dev 1 function 0 not configured
simba1 at pci0 dev 1 function 1: Sun Microsystems Simba PCI bridge (rev. 0x11)
pci2 at simba1 bus 1
pci2: i/o space, memory space enabled
ebus0 at pci2 dev 1 function 0
ebus0: Sun Microsystems PCIO Ebus2, revision 0x01
auxio0 at ebus0 addr 726000-726003 addr 728000-728003 addr 72a000-72a003 addr 72c000-72c003 addr 72f000-72f003
power at ebus0 addr 724000-724003 ipl 37 not configured
SUNW,pll at ebus0 addr 504000-504002 not configured
com0 at ebus0 addr 3803f8-3803ff ipl 60panic: ino 60
kdb breakpoint at 1262dd0
1 tt=1ff tstate=0 tpc=0x0 tnpc=0x0
Stopped in pid 0 (swapper) at   cpu_Debugger+0x4:       nop
db> 

...but it apparently doesn't like the serial port's interrupt property.

ok dev su@14,3803f8
ok ls
ok .properties
port-a-ignore-cd 
interrupts               00000001 
reg                      00000014 003803f8 00000008 
interrupt-priorities     00 00 00 0c 00 00 00 0c 
device_type              serial
name                     su
ok 

-- 
        -- Jason R. Thorpe <thorpej@zembu.com>