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Date: Mon, 16 Jun 2008 12:58:13 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
CC: Paul Jackson <pj@sgi.com>, Yinghai Lu <yhlu.kernel@gmail.com>,
       ying.huang@intel.com, mingo@elte.hu, tglx@linutronix.de,
       steiner@sgi.com, travis@sgi.com, linux-kernel@vger.kernel.org,
       andi@firstfloor.org, akpm@linux-foundation.org
Subject: Re: [PATCH 4/8] x86 boot: allow overlapping ebda and efi memmap memory
 ranges
References: <20080616062945.14597.78009.sendpatchset@polaris-admin.engr.sgi.com>	<20080616063001.14597.96170.sendpatchset@polaris-admin.engr.sgi.com>	<1213600062.11185.13.camel@caritas-dev.intel.com>	<20080616032457.718f4d87.pj@sgi.com>	<1213606435.12968.14.camel@caritas-dev.intel.com>	<48568B56.7060307@zytor.com>	<20080616113806.2ff4c1a4.pj@sgi.com>	<48569D62.9050107@zytor.com>	<20080616123721.bb9195e6.pj@sgi.com>	<86802c440806161041v5f582d4y2a65adf57451a6d9@mail.gmail.com>	<20080616130938.527283f7.pj@sgi.com>	<4856AE64.7020906@zytor.com> <20080616195340.7d0a56a8@lxorguk.ukuu.org.uk>
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Alan Cox wrote:
>>
>> 0x40E contains the pointer to the EBDA; this basically tests for the 
>> existence of an EBDA at all.
> 
> I'd disagree with the "very old". Machines without EBDA go right up to
> the AMD Athlon era and maybe beyond that. My old dual Athlon box has no
> EBDA.
> 

Fair enough.

	-hpa