hello

i got a new machine (Enterprise 420R) and try to install NetBSD on it. 
But the Systems locks while booting the installation kernel

Trace:

ok boot cdrom
Boot device: /pci@1f,4000/scsi@3/disk@6,0:f  File and args:
NetBSD IEEE 1275 Bootblock
..>> NetBSD/sparc64 OpenFirmware Boot, Revision 1.8
 >> (builds@b4.netbsd.org, Mon Dec 19 03:43:43 UTC 2005)
devopen: getdisklabel returned no disk label
devopen: search_label returned no disk label
loadfile: reading header
elf64_exec: Booting 
/pci@1f,4000/scsi@3/disk@6,0:f/netbsd+5570288@0x1800000+2818320@0x1d4fef0
symbols @ 0xfff42400 195- start=0x1000000
chain: calling OF_chain(800000, d728, 1000000, fff83a80, 18)
Kernel size exceeds 4MB
console is /pci@1f,4000/ebus@1/se@14,400000:a
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
    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 3.0 (INSTALL) #0: Mon Dec 19 04:06:57 UTC 2005
    
builds@b4.netbsd.org:/home/builds/ab/netbsd-3-0-RELEASE/sparc64/200512182024Z-obj/home/builds/ab/netbsd-3-0-RELEASE/src/sys/arch/sparc64/compile/INSTALL
total memory = 256 MB
avail memory = 236 MB
bootpath: /pci@1f,4000/scsi@3,0/disk@6,0:f
mainbus0 (root): SUNW,Ultra-80: hostid 80f027cf
cpu0 at mainbus0: SUNW,UltraSPARC-II @ 450.031 MHz, version 0 FPU
cpu0: 32K instruction (32 b/l), 16K data (32 b/l), 4096K external (64 b/l)
psycho0 at mainbus0 addr 0xfffb4000
SUNW,psycho: impl 0, version 4: ign 7c0 bus range 0 to 0; PCI bus 0
DVMA map: fe000000 to ffffe000
IOTSB: 422000 to 42a000
pci0 at psycho0
pci0: i/o space, memory space enabled
ebus0 at pci0 dev 1 function 0
ebus0: Sun Microsystems PCIO Ebus2, revision 0x01
auxio0 at ebus0 addr 726000-726003, 728000-728003, 72a000-72a003, 
72c000-72c003, 72f000-72f003
power at ebus0 addr 724000-724003 ipl 37 not configured
SUNW,pll at ebus0 addr 504000-504002 not configured
sc at ebus0 addr 500000-500007 not configured
sab0 at ebus0 addr 400000-40007f ipl 43: rev 3.2
sabtty0 at sab0 port 0: console i/o
sabtty1 at sab0 port 1
com0 at ebus0 addr 3083f8-3083ff ipl 41: ns16550a, working fifo
kbd0 at com0
com1 at ebus0 addr 3062f8-3062ff ipl 42: ns16550a, working fifo
ms0 at com1
wsmouse0 at ms0 mux 0
lpt0 at ebus0 addr 3043bc-3043cb, 300398-300399, 700000-70000f ipl 34
fdthree at ebus0 addr 3023f0-3023f7, 706000-70600f, 720000-720003 ipl 39 
not configured
clock0 at ebus0 addr 0-1fff: mk48t59
flashprom at ebus0 addr 0-fffff not configured
hme0 at pci0 dev 1 function 1: Sun Happy Meal Ethernet, rev. 1
hme0: interrupting at ivec 3021
hme0: Ethernet address 08:00:20:f0:27:cf
ukphy0 at hme0 phy 1: Generic IEEE 802.3u media interface
ukphy0: OUI 0x0006b8, model 0x000c, rev. 1
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
esiop0 at pci0 dev 3 function 0: Symbios Logic 53c875 (ultra-wide scsi)
esiop0: using on-board RAM
esiop0: interrupting at ivec 20
scsibus0 at esiop0: 16 targets, 8 luns per target
esiop1 at pci0 dev 3 function 1: Symbios Logic 53c875 (ultra-wide scsi)
esiop1: using on-board RAM
esiop1: interrupting at ivec 26
scsibus1 at esiop1: 16 targets, 8 luns per target
psycho1 at mainbus0 addr 0xfffc6000
SUNW,psycho: impl 0, version 4: ign 7c0 bus range 128 to 128; PCI bus 128
pci1 at psycho1
pci1: i/o space, memory space enabled
timer0 at mainbus0 addr 0xfff9fc00 irq vectors 7ec and 7ed
pcons at mainbus0 not configured
wskbd0 at kbd0 mux 1
kbd0: reset failed
Kernelized RAIDframe activated
md0: internal 5120 KB image area
scsibus0: waiting 2 seconds for devices to settle...
scsibus1: waiting 2 seconds for devices to settle...
probe(esiop0:0:0:0): command timeout, CDB: 0x12 00 00 00 24 00

i can't print out any debug information, because the system freezes.
i also try NetBSD 2.1 and it crashs with the same timeout command.
1.6.2 also crash, but without any information. The system freeze after:
"scsibus0: waiting 2 seconds for devices to settle..."
somebody send the same issue to the mailinglist for a Netra 1405 ( 
http://mail-index.netbsd.org/netbsd-bugs/2004/05/04/0005.html )
and for a E450 ( 
http://mail-index.netbsd.org/port-sparc64/2004/06/12/0002.html )
but without any usefull result :-(

i also try OpenBSD 3.8 and the installation CD boots without any problems.
so it shouldn't be a hardware fault.

My Diskconfiguration was:
ok probe-scsi
Target 0
  Unit 0   Disk     COMPAQ  HD0093172C      3208
Target 1
  Unit 0   Disk     COMPAQ  HD0093172C      3207
Target 6
  Unit 0   Removable Read Only device    TOSHIBA DVD-ROM SD-M14011007

i also try to remove one or all disks, but this change nothing.

Best Regards