iBook G4: shrink OSX to make room for FreeBSD?

[Torfinn Ingolfsen]

Hello, 
I've tried to get an answer to this question on Mac forums (and other places)without success.
Perhaps someone reading this mailing list knows the answer?

I got myself an iBook (used) for cheap, and I want to install FreeBSD on it. But I also want to keep a small partition with OS X on it. The machine cam with OS X 10.4.11 installed on the hard drive, but didn't come with install media.

So I thought, I'll just shrink the OS X partition (currently there is only one partition on the hard drive) to make room. Well, it turns out that the diskutil method (from OS X) doesn't work on PPC Macs:
$sudo diskutil resizeVolume disk0s3 limits
Error obtaining resizing information

Resizing encountered error Could not modify partition map (-9986) on disk disk0s3 Macintosh HD

Note: this was done with OS X booted off an external drive (firewire)
And gparted seems to be only for x86-compatible machines...

Does anyone know a way to shrink a partition on a PPC Mac? 
-- 
Torfinn