linux-kernel - Re: [PATCH 5/5] x86: efi: allow basic init with mixed 32/64-bit efi/kernel

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Date:	Thu, 5 Jan 2012 12:59:39 -0800
From:	Olof Johansson <olof@...om.net>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH 5/5] x86: efi: allow basic init with mixed 32/64-bit efi/kernel

On Thu, Jan 5, 2012 at 10:21 AM, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> This seems like a reasonable step, but outside some special cases it's
> not going to be terribly useful - general purpose EFI machines aren't
> going to boot unless you can set the boot variable, which requires
> runtime services. ChromeOS machines presumably have their own way of
> handling this so I've no objection to adding it if it helps them, but
> just wanted to make sure people knew that it's something that we'd still
> need to fix up if we want this to work elsewhere.

Thanks, good point. And yes, on ChromeOS there is a wrapper around the
kernel that provides the bootargs and a few other things, so we get by
with this limited EFI support there.

Given that the feature has been missing for years now, and it's a
nontrivial amount of work to get the mode switching implemented right
and debugged, I'm not inclined to go the whole way. This is a good
start, and if someone needs the rest of the functionality they can
build on top of this.


-Olof
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