Booting OS X with Grub2

I installed Ubuntu on a Mac Mini at work and needed to get back into OS X for some testing.  The default configured Grub entries wouldn’t load for OS X (hd0, part0).  After looking over the net and digging through lines and lines of Grub conf I found a little blurb from another user saying they’d tried this and it worked… so if you’re beating yourself up over OS X and Grub2 give this a try and see if it works… it did for me.

open up your Grub2 conf file, which in Ubuntu is located at

/boot/grub/grub.cfg

Then at the bottom of the menu entries I added:

menuentry "Mac OS X (Custom/Bootable)" --class osx --class darwin --class os {
        set root=(hd0,0)
        exit
}

This entry gets me booted into rEFIt at which point I can properly boot into OS X Lion without issues.  From this point forward the machine will default into rEFIt until you choose to boot into Linux again… which will push you back into Grub2 for future boots.

“If it’s stupid but it works, it isn’t stupid.”

Note: I’d already installed and had rEFIt running from the previous Ubuntu install