installing openbsd/vax on simh-vax

Hi,

I'm trying to install OpenBSD 5.1/vax on simh-vax.  I installed it
successfully, but boot failed with "panic: cannot open disk,
0x900/0x902, error 6".

I'm following instructions written in
http://www.openbsd.org/vax-simh.html .

% sysctl kern.version
kern.version=OpenBSD 5.2-current (GENERIC.MP) #8: Fri Oct  5 13:10:06 JST 2012
    [email protected]:/home/yasuoka/source/openbsd/src/sys/arch/i386/compile/GENERIC.MP
% pkg_info -c simh
Information for inst:simh-3.9.0p0

Comment:
PDP, IBM 1401, Nova and other CPUs simulator


% sudo simh-vax openbsd.simh

VAX simulator V3.9-0
NVR: buffering file in memory
Eth: opened OS device msk0
Loading boot code from /usr/local/lib/simh/vax/ka655x.bin


KA655-B V5.3, VMB 2.7
Performing normal system tests.
40..39..38..37..36..35..34..33..32..31..30..29..28..27..26..25..
24..23..22..21..20..19..18..17..16..15..14..13..12..11..10..09..
08..07..06..05..04..03..
Tests completed.
>>>boot DUA0:
(BOOT/R5:0 DUA0



  2..
-DUA0
  1..0..


>> OpenBSD/vax boot [1.16] <<
>> Press enter to autoboot now, or any other key to abort: 0
> boot bsd
1805672+63328+434840+[127380+157435]=0x277ff3
[ using 284815 bytes of bsd a.out symbol table ]
Copyright (c) 1982, 1986, 1989, 1991, 1993
        The Regents of the University of California.  All rights reserved.
Copyright (c) 1995-2012 OpenBSD. All rights reserved.  http://www.OpenBSD.org

OpenBSD 5.1 (GENERIC) #46: Tue Feb 14 12:17:31 MST 2012
    [email protected]:/usr/src/sys/arch/vax/compile/GENERIC
MicroVAX 3800/3900 [0A000006 01530302]
cpu: KA655, CVAX microcode rev 6 Firmware rev 83
real mem = 67043328 (63MB)
avail mem = 61378560 (58MB)
mainbus0 at root
ibus0 at mainbus0
uba0 at ibus0: Q22
dz0 at uba0 csr 160100 vec 196 ipl 17
mtc0 at uba0 csr 174500 vec 508 ipl 17
mscpbus0 at mtc0: version 5 model 3
mscpbus0: DMA burst size set to 4
mt0 at mscpbus0 drive 0: TK50
mt1 at mscpbus0 drive 1: TK50
mt2 at mscpbus0 drive 2: TK50
mt3 at mscpbus0 drive 3: TK50
uda0 at uba0 csr 172150 vec 504 ipl 17
mscpbus1 at uda0: version 3 model 3
mscpbus1: DMA burst size set to 4
ra0 at mscpbus1 drive 0: RA92
ra1 at mscpbus1 drive 1: RRD40
ra2 at mscpbus1 drive 2: RRD40
rx0 at mscpbus1 drive 3: RX50
qe0 at uba0 csr 174440 vec 500 ipl 17: delqa, address 08:00:2b:aa:bb:cc
vscsi0 at root
scsibus0 at vscsi0: 256 targets
softraid0 at root
scsibus1 at softraid0: 256 targets
boot device: ra0
disklabels not read: ra0 ra1 ra2 rx0
root on ra0a swap on ra0b dump on ra0b
panic: cannot open disk, 0x900/0x902, error 6
Stopped at      _dk_mountroot+0x53:     ashl    $4, r7, r5
RUN AT LEAST 'trace' AND 'ps' AND INCLUDE OUTPUT WHEN REPORTING THIS PANIC!
DO NOT EVEN BOTHER REPORTING THIS WITHOUT INCLUDING THAT INFORMATION!
ddb> trace
Stack traceback :
_main+0x4e0(void)
_start+0x5a6(0x3ad538)
ddb> ps
   PID   PPID   PGRP    UID  S       FLAGS  WAIT          COMMAND
     5      0      0      0  3    0x100200  bored         crypto
     4      0      0      0  3    0x100200  pftm          pfpurge
     3      0      0      0  3    0x100200  rxonline      syswq
     2      0      0      0  3  0x40100200                idle0
     1      0      0      0  3           0  initexec      swapper
*    0     -1      0      0  7       0x200                swapper
ddb> 

any comments would be welcome.

--yasuoka