I would like to be able to boot from an ISO stored on an HFS+ partition (the main partition on my macbook pro). Here is what I've done so far:

(writing in shorthand :D)

grub> insmod hfs,hfsplus,loopback,part_gpt
grub> loopback loop (hd0,gpt2)/location/to/img.io
grub> configfile (loop)/boot/grub/loopback.cfg ...

This does not work. tab-complete of the (loop) path does not work...

However, this does work (tab-complete and all) if the iso comes from my ext3 partition.

For particular reasons, I can't have the iso images on the ext3 partition, they need to be kept on the hfs+ partition. What should be done?