From mboxrd@z Thu Jan  1 00:00:00 1970
From: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
Subject: Re: [PATCH -v2 0/4] EFI 1:1 mapping
Date: Wed, 19 Jun 2013 15:25:20 +0200
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To: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Linux EFI <linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Matt Fleming <matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>, Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>, X86 ML <x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Borislav Petkov <bp-l3A5Bk7waGM@public.gmane.org>
List-Id: linux-efi@vger.kernel.org

On Wed, Jun 19, 2013 at 03:04:34PM +0200, Ingo Molnar wrote:
> Do we know why?

Well, according to mjg59 some Macs break if we don't give them a map
which uses high addresses.

I can imagine flipping the meaning of this option to be on by default
and "efi=no_11_map" to disable the 1:1 map for those Macs.

> A bug I suspect?

Probably. The problem is, it is very hard to debug the boot stub that
early. And of course, I can't reproduce it in qemu :(. If only I had a
hardware debugger...

> But once it works reliably we can enable it, right?

It's all the same to me - I hate EFI with passion so whatever people
agree upon, I'll do it.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--