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Date: Mon, 23 Apr 2007 10:45:41 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: "Eric W. Biederman" <ebiederm@xmission.com>
CC: Jeremy Fitzhardinge <jeremy@goop.org>, Chuck Ebbert <cebbert@redhat.com>,
       Andi Kleen <ak@suse.de>, Andrew Morton <akpm@linux-foundation.org>,
       virtualization@lists.osdl.org, lkml <linux-kernel@vger.kernel.org>,
       Zachary Amsden <zach@vmware.com>, Chris Wright <chrisw@sous-sol.org>,
       Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 10/28] i386: map enough initial memory to create lowmem
 mappings
References: <20070414204154.871250608@goop.org>	<200704192250.52633.ak@suse.de> <4627D756.5020405@zytor.com>	<200704192304.01053.ak@suse.de> <4627DB0C.2010804@zytor.com>	<4627DDAD.4070805@redhat.com> <4627E099.209@goop.org>	<m1d51vxxm4.fsf@ebiederm.dsl.xmission.com> <462CE027.4030302@goop.org>	<462CE1E0.9060007@zytor.com> <462CE69E.8040207@goop.org> <m1vefnvvyb.fsf@ebiederm.dsl.xmission.com>
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Eric W. Biederman wrote:
> 
> - I know of one system that had BIOS tables at 16MB I believe (and
>   thus had a fairly low hole).
> 

Please name names, otherwise this is just rumouring.  Seriously.  We 
have enough cargo-cult programming as it is.

A lot of old ISA systems had an option to put a memory hole at 15-16 MB 
to support ISA video cards with linear frame buffer.  It very rarely got 
used, since VLB took over around the same time.

	-hpa