Installing on a Powerstack

Hi,

i am trying to do a first-time install on an old Motorola PowerStack
with an PowerPC 604e processor.
After "sysinst.fs" got loaded via TFTP i see the the spinning cursor and
finally the following:

162,83
Warning: no residual data.

>> NetBSD/prep BOOT, Revision 1.5
>> (builds@build, Mon Dec 00:12:27 UTC 2004

Boot: Loading in()
3537044+185960=0x38d160
Start=0x100000

And that is all it does. - Does anybody know, what boot-options or the
like i have to enter on the boot-prompt?

cheers,
simon