I tried from the Mac Osx, then ubuntu ppc newest (it doesn't recognize hfs+ for changing), and Morphos only option is using whole partition.
I don't want to loose the Mac OS X partition just yet.

Thanks in advance for any help.

You have to boot a 10.5 Mac OS DVD in order to resize the partition.

See http://library.morph.zone/Dual-boot_MorphOS_and_MacOS_X_on_a_Mac_Mini_G4

You can use Disc utility of Leopard to resize your Mac partition without loosing data (DO NOT USE tiger version or you'll loose all your data!). After that, under MorphOS (use SYS:Tools/HDConfig) you can create in that space how many partitions you want.
My suggestion is to use one little partition (Boot:) only for the boot.img (my "Boot:" partition is 64MB), another partition (let's say DH0:) for MorphOS (usually labelled "System" or "MorphOS"). 1 Gb will be more than enough. After that another big partition (let's say DH1:) for all the software you'll install (usually labelled "Work").

My Hd is partitioned in this way:

- Mac partition with Leopard

- Boot: (64MB label "Boot")
- DH0: (1GB label "MorphOS")
- DH1: (20GB label "Work")
- DH2: (30 GB label "Data") this last one is where I store my mp3, movies, pictures, documents..

Thanks :) I would like to have Linux as dualboot, but for now Mac osx and Morphos should be enough.