Hey Andy, I asked this question a ways back.  Here's what I know about GC 
and NetBSD.

It should be possible.  There are a few kits out there that let you boot 
from a special memory card (it has a USB port).

I've also read that the PPC inside the GC (Gekko) is pretty standard in 
terms of being compatible with other PPC chips of that generation.  The 
person in that article said that most things compiled for PPC should 
compile on the gekko.  Of course drivers are another issue.

There's the GClinux way of doing things - use the PSO error exploit to 
boot.  I haven't tried this yet.

The kit I mentioned is called the Max Drive Pro from Codejunkies

http://us.codejunkies.com

This prolly wasn't too helpful, and admittedly OT, so if you want to 
continue, email me directly.

-Andy

On Wed, 19 Jan 2005, Andy Ruhl wrote:

> I don't know the right place to ask this, so I'll ask it here.
> 
> There is a way to boot code on a GameCube now with no modifications to
> the box. It's not really cheap to do it, but it's do-able.
> 
> There is a linux site at www.gc-linux.com, but it's not very well
> documented for a user. As a matter of fact, it appears that useful
> information about booting Linux is being withheld from this site, as
> far as I can tell.
> 
> I don't know what hardware is in a GameCube other than PPC processor.
> Don't know if NetBSD drivers already exist for the stuff in it. If so,
> it might be easy (for someone who knows this stuff) to get it
> working... Wish I knew more about hardware hacking...
> 
> Andy
>