[OpenBSD/Sparc] option raid ne demarre pas le systeme

Bonjour à tous,

J'ai une SS20 (monoproc Ross 150Mhz, 512M) sous la main sur laquelle
je voudrais configurer un raid pour les deux DD qu'il y a (2x2Go).
J'ai installé la 3.6 et compilé un nouveau noyau avec :
option RAID_AUTOCONFIG
pseudo-device raid 4

Sauf que ça me fait l'erreur suivante au moment de démarrer le
système :

SPARCstation 20 (1 X RT626), No Keyboard
ROM Rev. 2.25, 512 MB memory installed, Serial #8018414.
Ethernet address 8:0:20:7a:59:ee, Host ID: 727a59ee.

Type help for more information
ok boot disk1:a bsd.raidsun4m
Boot device: /iommu/sbus/espdma@f,400000/esp@f,800000/sd@1,0:a File
and args: bsd.raidsun4m
>> OpenBSD BOOT 2.2
Booting bsd.raidsun4m @ 0x4000
3121744+315328 [52+138832+125822Instruction Access Exception
ok

J'ai rien trouvé de semblable sur le net et étant débutant sur cette
plateforme toute aide serait appréciée. J'ajoute ci-dessous le dmesg.

Merci d'avance.

OpenBSD 3.6 (GENERIC) #203: Fri Sep 17 15:18:56 MDT 2004
deraadt@sparc.openbsd.org:/usr/src/sys/arch/sparc/compile/GENERIC
real mem = 536391680
avail mem = 499101696
using 200 buffers containing 13107200 bytes of memory
bootpath: /iommu@f,e0000000/sbus@f,e0001000/espdma@f,400000/esp@f,800000/sd@1,0
mainbus0 (root): SUNW,SPARCstation-20
cpu0 at mainbus0: RT620/625 @ 150 MHz, on-chip FPU
cpu0: 512K byte write-back, 32 bytes/line, sw flush cache enabled
obio0 at mainbus0
clock0 at obio0 addr 0xf1200000: mk48t08 (eeprom)
timer0 at obio0 addr 0xf1300000 delay constant 73
zs0 at obio0 addr 0xf1100000 pri 12, softpri 6
zstty0 at zs0 channel 0 (console i/o)
zstty1 at zs0 channel 1
zs1 at obio0 addr 0xf1000000 pri 12, softpri 6
zskbd0 at zs1 channel 0: reset timeout
zskbd0: no keyboard
zstty2 at zs1 channel 1: mouse
fdc0 at obio0 addr 0xf1700000 pri 11, softpri 4: chip 82077
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
auxreg0 at obio0 addr 0xf1800000
power0 at obio0 addr 0xf1a01000
iommu0 at mainbus0 ioaddr 0xe0000000: version 0x3/0x1, page-size 4096, range 64MB
sbus0 at iommu0: clock = 25 MHz
dma0 at sbus0 slot 15 offset 0x400000: rev 2
esp0 at dma0 offset 0x800000 pri 4: ESP200, 40MHz, SCSI ID 7
scsibus0 at esp0: 8 targets
sd0 at scsibus0 targ 1 lun 0: <IBM, DCAS32160SUN2.1G, S60B> SCSI2 0/direct fixed
sd0: 2063MB, 8188 cyl, 3 head, 172 sec, 512 bytes/sec, 4226725 sec total
sd1 at scsibus0 targ 3 lun 0: <SEAGATE, ST32155W SUN2.1G, 8826> SCSI2 0/direct fixed
sd1: 2049MB, 4177 cyl, 8 head, 125 sec, 512 bytes/sec, 4197405 sec total
cd0 at scsibus0 targ 6 lun 0: <TOSHIBA, XM-5401TASUN4XCD, 1036> SCSI2 5/cdrom removable
ledma0 at sbus0 slot 15 offset 0x400010: rev 2
le0 at ledma0 offset 0xc00000 pri 6: address 08:00:20:7a:59:ee
le0: 16 receive buffers, 4 transmit buffers
bpp0 at sbus0 slot 15 offset 0x4800000: DMA2
SUNW,DBRIe at sbus0 slot 14 offset 0x10000 not configured
cgsix0 at sbus0 slot 2 offset 0x0: SUNW,501-2325, 1152x900, rev 11
wsdisplay0 at cgsix0
wsdisplay0: screen 0 added (std, sun emulation)
root on sd0a
rootdev=0x700 rrootdev=0x1100 rawdev=0x1102

--
Serge