Comment 4 for bug 508802

update:

I managed to get a booting Puredyne liveUSB with this:
 * create a 32MB FAT32 primary partition on the key
 * copy the attached folder in it (it contain efi drivers and grub2 config)
 * Make a following partition with the usual live folder (took the one from an existing working Puredyne liveUSB)

Live kernel and initrd are loading fine but the macbook I'm testing it on has a linux partition that seems to make live-initramfs confused, I need to find someone with a standard macbook to properly test.