that is for new world macs the ofwboot.xcf.  beige g3's are old world 
you also need to set the boot file.  it should be NETBSD.MACPPC. 
however it is in the documentation as described here 
ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-2.0.2/macppc/INSTALL.html#Booting%20the%20NetBSD/macppc%20install%20CD-R
On 
Sun, 26 Jun 2005, Chris Tribo wrote:

> Date: Sun, 26 Jun 2005 22:03:23 -0400 (EDT)
> From: Chris Tribo <ctribo@dtcc.edu>
> To: Michael Lazin <microlaser@gmail.com>
> Cc: port-macppc@NetBSD.org
> Subject: Re: newbie question, boot cd on beige g3
> 
>
> You need the system disk or startup disk patches loaded, then
>
> boot ide0/@0:0 for the HD
> boot ide1/@0:0,OFWBOOT.XCF;1 for the CD
>
> On Sun, 26 Jun 2005, Michael Lazin wrote:
>
>> I am attempting to install netbsd on a beige g3.  I have looked at the
>> archives and have been unable to find a boot command in the open
>> firmware that boots my netbsd install cd.  Does anyone have experience
>> installing on the beige g3?  My machine has a ide cd-rom and ide hard
>> drive.  I am new to bsd but have some experience with linux.  Any help
>> would be appreciated.
>>
>> Thanks,
>>
>> Michael
>>
>>
>
> -- 
> The nice thing about Windows is - It does not just crash, it displays a
> dialog box and lets you press 'OK' first.
> 						-- Arno Schaefer
>