My Integrix UWS1 almost netbooted.  Below is the console output:

ok boot net netbsd
Resetting ... 


Ultra 1 UPA/SBus (UltraSPARC 167MHz), No Keyboard
OpenBoot 3.0, 256 MB memory installed, Serial #3867098.
Ethernet address 0:40:dc:3b:1:da, Host ID: 803b01da.



Rebooting with command: boot net netbsd                               
Boot device: /sbus/SUNW,hme@e,8c00000  File and args: netbsd
Timeout waiting for ARP/RARP packet
15400 >> NetBSD/sparc64 OpenFirmware Boot, Revision 
>> (mrg@powerofseven.eterna.com.au, Sat Aug 19 02:35:03 EST 2000)
Using BOOTPARAMS protocol: ip address: 192.168.0.4, hostname: vulcan
root addr=192.168.0.1 path=/export/vulcan/root
loadfile: reading header
elf64_exec: Booting /sbus@1f,0/SUNW,hme@e,8c00000/netbsd
3021759@0xf1000000+221136@0xf1400000+433608@0xf1435fd0 
symbols @ 0xfff12300 74+242448+125126 start=0xf1000000
chain: calling OF_chain(800000, ef18, f1000000, fffb3a80, 18)
[ using 368424 bytes of netbsd ELF symbol table ]
pmap_bootstrap: could not claim physical dseg extention at 178a0000 size
360000
Our trap handler is enabled
consinit()
setting up stdin
stdin instance = fffe8458
setting up stdout
stdout instance = fffe8608
stdout package = f005a058
console is unknown
Copyright (c) 1996, 1997, 1998, 1999, 2000
    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 1.5E (GENERIC) #0: Sat Aug 19 04:19:06 EST 2000
    mrg@powerofseven.eterna.com.au:/orb/p/src/sys/arch/sparc64/compile/GENERIC
total memory = 256 MB
avail memory = 228 MB
using 832 buffers containing 13208 KB of memory
bootpath: /sbus@1f,0/SUNW,hme@e,8c00000
mainbus0 (root): SUNW,Ultra-1
cpu0 at mainbus0: SUNW,UltraSPARC @ 167 MHz, version 0 FPU
cpu0: physical 4K instruction (32 b/l), 4K data (32 b/l), 2048K external
(64 b/l) 
timer0 at mainbus0 addr 0xfffc3c00 irq vectors 7f0 and 7f1
sbus0 at mainbus0 addr 0xfffcc000: clock = 25 MHz
DVMA map: ff802000 to ffffe000
audiocs0 at sbus0 slot 13 offset 0xc000000 vector 24 ipl 13: CS4231A
audio0 at audiocs0: full duplex
auxio0 at sbus0 slot 15 offset 0x1900000
flashprom at sbus0 slot 15 offset 0x0 not configured
SUNW,fdtwo at sbus0 slot 15 offset 0x1400000 vector 29 ipl 11 not configured
clock0 at sbus0 slot 15 offset 0x1200000: mk48t59: hostid ffffffff803b01da
zs0 at sbus0 slot 15 offset 0x1100000 vector 28 ipl 12 softpri 6
zstty0 at zs0 channel 0 (console i/o)
zstty1 at zs0 channel 1
zs1 at sbus0 slot 15 offset 0x1000000 vector 28 ipl 12 softpri 6
kbd0 at zs1 channel 0
ms0 at zs1 channel 1
intr_establish: intr reused 2024
sc at sbus0 slot 15 offset 0x1300000 not configured
SUNW,pll at sbus0 slot 15 offset 0x1304000 not configured
SUNW,fas at sbus0 slot 14 offset 0x8800000 vector 20 ipl 3 not configured
hme1 at sbus0 slot 14 offset 0x8c00000 vector 21 ipl 6: address
00:40:dc:3b:01:da
nsphy0 at hme1 phy 1: DP83840 10/100 media interface, rev. 0
nsphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
bpp0 at sbus0 slot 14 offset 0xc800000 vector 22 ipl 2: rev unknown
(0x20000000)
SUNW,ffb at mainbus0 addr 0xffb68000 not configured
pcons at mainbus0 not configured
raidattach: Asked for 4 units
Kernelized RAIDframe activated
root device: hme1
dump device: hme1
file system (default generic): nfs
root on hme1 dumps on hme1h
nfs_boot: trying RARP (and RPC/bootparam)
nd6_na_input: duplicate IP6 address fe80:0001::0240:dcff:fe3b:01da
nfs_boot: client_addr=192.168.0.4 (RARP from 192.168.0.1)
hme1: error interrupt, status=20101<GOTFRAME,SENTFRAME,NORXD>
hme1: error interrupt, status=20101<GOTFRAME,SENTFRAME,NORXD>
nfs_boot: timeout...
hme1: error interrupt, status=20101<GOTFRAME,SENTFRAME,NORXD>
nfs_boot: timeout...
hme1: error interrupt, status=20101<GOTFRAME,SENTFRAME,NORXD>
nfs_boot: timeout...
hme1: error interrupt, status=20101<GOTFRAME,SENTFRAME,NORXD>
nfs_boot: bootparam whoami, error=60
cannot mount root, error = 60
root device (default hme1): 


tcpdump reports the following:

Sep  7 21:32:20 scrappy rarpd[199]: received packet on ep0
21:33:32.098484 vulcan Broadcast rarp 60: rarp who-is vulcan tell vulcan
21:33:32.102196 scrappy vulcan rarp 42: rarp reply vulcan at vulcan
21:33:32.591124 vulcan Broadcast rarp 60: rarp who-is vulcan tell vulcan
21:33:32.594654 scrappy vulcan rarp 42: rarp reply vulcan at vulcan
21:33:32.650847 vulcan Broadcast arp 60: arp who-has vulcan tell vulcan
21:33:35.652367 vulcan Broadcast ip 138: vulcan.1023 >
192.168.0.255.sunrpc: udp 96
21:33:36.651109 vulcan Broadcast ip 138: vulcan.1023 >
192.168.0.255.sunrpc: udp 96
21:33:38.651033 vulcan Broadcast ip 138: vulcan.1023 >
192.168.0.255.sunrpc: udp 96
21:33:41.690920 vulcan Broadcast ip 138: vulcan.1023 >
192.168.0.255.sunrpc: udp 96
21:33:45.730783 vulcan Broadcast ip 138: vulcan.1023 >
192.168.0.255.sunrpc: udp 96
21:33:50.791544 vulcan Broadcast ip 138: vulcan.1023 >
192.168.0.255.sunrpc: udp 96
21:33:55.851281 vulcan Broadcast ip 138: vulcan.1023 >
192.168.0.255.sunrpc: udp 96
21:34:00.911124 vulcan Broadcast ip 138: vulcan.1023 >
192.168.0.255.sunrpc: udp 96


PS
  scrappy is the NetBSD-i386 server, vulcan is the UWS1




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