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Date: Mon, 20 Aug 2007 21:13:44 +0100
From: Matthew Garrett <mjg59@srcf.ucam.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       "Huang, Ying" <ying.huang@intel.com>,
       Andrew Morton <akpm@linux-foundation.org>, Andi Kleen <ak@suse.de>,
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Subject: Re: [PATCH 0/3] x86_64 EFI runtime service support
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On Mon, Aug 20, 2007 at 10:05:11AM -0700, H. Peter Anvin wrote:
> Yinghai Lu wrote:
> > 
> > someone told me that EFI PEI will be 32 bit ( for mem etc
> > initialization), and after that will be 64 bit, so the Run time
> > service will be 64 bit only, and it will only support 64 bit OS with
> > EFI. and they have another mode to emulate the legacy BIOS to boot
> > 32bit OS.
> > 
> 
> That seems unlikely for e.g. the existing Macs already in the field.

In which direction? The existing Macs will boot a 32 (or 16) bit OS 
using legacy BIOS emulation. I've no idea if their EFI is 32 or 64 bit, 
though.

-- 
Matthew Garrett | mjg59@srcf.ucam.org
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