I have been helping with dev work on GRUB-EFI. Apparently there are
some issues when using 64bit binaries on 32bit EFI firmware and vice-
versa. This is what your rEFIt error sounds like. I think this was
mostly fixed in grub2. I would start with that though. There was a lot
of progress in getting everything working for a true EFI boot there.
There is a thread in ubuntuforums (in the Apple section) about this. I
can't access it right now, otherwise I'd just post the link.
On Jun 24, 2009, at 6:43 PM, Stefan Monnier wrote:
> I'm trying to get my GNU/Linux rescue key (basically a USB key with
> a Debian install on it) to work on my Macbook Pro, but am
> encountering problems.
>
> Apparently my Macbook Pro is not able to access USB drives when booted
> using the "legacy BIOS" boot mode (aka "bootcamp"). So I need to
> use an
> EFI boot loader.
>
> I have added an HFS+ partition to my USB key, and have added Debian's
> elilo.efi loader into it. By blessing the corresponding folder, I can
> get that entry to appear in the Mac's boot menu, but selecting it
> "doesn't work" (the screen stays blank while the key appears to be
> accessed for a few seconds and then the boot falls back to booting the
> main OS X from the hard drive). Apparently, there's some kind of
> error,
> but I don't get any report about it.
>
> I then tried to boot via rEFIt+elilo, but rEFIt gives me the error:
>
> Starting elilo.efi
> Error: Unsupported while loading elilo.efi
>
> Does anybody have some idea of what I need to do to get the damn thing
> to boot? I know the machine can boot straight from USB since it has
> booted a Mac OS X distribution this way without any difficulty.
>
>
> Stefan
>
>
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