[SPARCbook] Trouble booting SB2

[Clive McAdam]

SPARCBook 2
Solaris 2.4 for SPARCBook Version C.0.2

When I boot from external CD-ROM with     6 1 /S2/kernel/unix    command, it
begins with the boot process from the external CD but then comes up with the
following messages :-


---snip---------------------
Cannot open '/etc/path_to_inst'
Halted

BAD TRAP: type=9 rp=f01c3d24 addr=0 mmu_fsr=126 rw=1
: Data fault
kernel read fault at addr=0x0, pme=0x0
.
.  ( various other kernel dump memory messages here )
.
End traceback...
Data fault
panic: data fault
syncing file system... done
Data fault
Press SPACE to reboot ..
---end snip--------------------


when I press the SPACE bar it just cycles this message.

Any clues anyone ?

Thanks in advance.

 - Clive