If you’ve been reading my entries, you already know that I’ve been working on installing different Linuxes on my Mac OS X PowerBook system, with success. All works well until you actually have more than one Linux installed on the system, creating a tri-boot, rather than dual-boot Apple computer. The problem is that, by default, each Linux installs its own version of yaboot which only knows about Mac OS X or itself. So I needed to figure out how to significantly modify the yaboot configuration file to support both Ubuntu and Yellow Dog Linux simultaneously.
If you haven’t read my other article on customizing yaboot, your best bet is actually to start here: Tweak yaboot so Mac OS X is my default OS, not Ubuntu or Yellow Dog Linux.
Having installed Yellow Dog, I suddenly couldn?t see Ubuntu any more. If I hadn?t previously written down the partition number that I used to install Ubuntu, I would have suspected that it had just vanished.
A quick query to Ethan Benson, developer of yaboot, and I had my answer: I needed to move the individual Linux partition specifier (it says partition=2) into the YDL section and add another section for Ubuntu that specified the partition of the Ubuntu installation (partition=9).
I ended up with two image blocks:
image=/boot/vmlinux-2.6.8-1.ydl.7 partition=2 label=yellowdog read-only initrd=/boot/initrd-2.6.8-1.ydl.7.img root=/dev/hda2 append=?rhgb quiet? image=/boot/vmlinux partition=9 root=/dev/hda9 label=ubuntu read-only initrd=/boot/initrd.img
When the Mac boots, I still see the standard yaboot options of linux, macosx or cdrom, but selecting linux now gives me the option of typing in either ?yellowdog? or ?ubuntu? to specify which I wanted to actually start.
Works like a charm!