In case anybody's searching the archives, the following suggestion
worked around the problem.  Thanks!

	-Neil

Joseph Sarkes wrote:
> 
> Try using the netbsd.GENERIC_MD kernel, that is the only one that I
> can get to work on my dual 1GHz G4.
> 
> Joseph Sarkes
> 
> On Friday, May 17, 2002, at 12:49 PM, Neil Ludban wrote:
> 
> > On a Power Mac G4, factory refurbished, single 800MHz processor.  The
> > model is M8493, which isn't listed in the Apple page linked to on the
> > NetBSD supported models page (it has gigabit ethernet and AGP video).
> >
> >       panic: cnopen: cn_tab->cn_dev == NODEV
> >
> > Open Firmware version is 4.3.3f2.  The system came with both OS9 and X
> > installed, I've repartitioned the drive and installed X.
> >
> > Attempting to install 1.5ZC snapshot from 20020407, I always get the
> > above panic.  Tried disconnecting mouse, moving USB plugs, and even
> > a different keyboard with no luck.
> >
> > Open Firmware devalias says:
> >       keyboard        /pseudo-hid/keyboard
> >       screen          /pci@f0000000/ATY,BlueStoneParent@10/
> >                               ATY,BlueStone_A
> > and printenv:
> >       input-device    keyboard
> >       output-device   screen
> >
> > boot command (entered manually) is:
> >       boot hd:9,\ofwboot.xcf /netbsd.INSTALL.gz
> >
> > (BTW, the install notes say netbsd.ram.gz, which doesn't seem to
> > exist in the distribution?)
> >
> > That's everything I've been able to find in install notes, FAQ, and
> > searching mailing lists... is there anything else I can try?
> >
> > TIA,
> >       -Neil
> >