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Help needed with SS20

Hello all,                                                                      
I'm not sure that is an appropriate mail list but would be glad to get
some help with installing OpenBSD 2.0 to my SPARCstation 20.  The
situation is: diskless installation runs as expected until kernel is
loaded and passed control to. After that all I got was some info about
processor type amount of memory and so on before jumping into debugger: 

Server IP address:
Client IP address:
>> OpenBSD BOOT [$Revision: 1.2 $]
boot: client IP address:
boot: client name: verba
root addr= path=/usr/OpenBSD/root
Booting bsd @ 0x4000
[ preserving 101620 bytes of bsd symbol table ]
Copyright ...
OpenBSD 2.0 (GENERIC) #0: Thu Oct 10 06:38:44 MDT 1996
real mem = 66310144
avail mem = 59875328
using 809 buffers containing 3313664 bytes of memory
bootpath: /iommu_(_at_)_f,e0000000/sbus_(_at_)_f,e0001000/ledma_(_at_)_f,400010/le_(_at_)_f,c00000
mainbus0 (root): SUNW,SPARCstation-20
cpu0 at mainbus0: TI,TMS390Z50 @ 50 MHz, on-chip FPU
cache enabledl 20K instruction (64 b/l), 16K data (32 b/l)
trap type 0x7: pc=f802bab4 npc=f802bab8 prs=40401fc7<EF,S,PS>
panic: alignment fault
Stopped at	_Debugger+0x4:	jmpl		[%o7 + 0x8], %g0
db> trace
_trap(7, 40401fc7, f802bab4, f812b750, 0, 0) at _trap+0x1fc
_kernel_text(4, f8788ac0, ffd6f150, f80dc194, 0, 8) at _kernel_text+0x36e4
_config_attach(0, 0, ffefebe0, 8000000, c00000, ffffffd0) at _config_attach+0x190

Actually OpenBSD behaves itself much better than NetBSD does which merely dies
saying only something useful like "Data fault" :)
Probably, I'm missing something obvious since I'm not of any expert in SUN's
stuff. tcpdump shows that no attempts to get any files but kernel had 
been made.

Thanks in advance, Yuri Shemanin.