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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: IO delay, port 0x80, and BIOS POST codes
Date: 14 Mar 2002 13:11:56 -0800
Organization: Transmeta Corporation, Santa Clara CA
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In-Reply-To: <a6qtb8$6fg$1@penguin.transmeta.com> <Pine.LNX.4.33.0203141234170.1286-100000@scsoftware.sc-software.com>
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Copyright: Copyright 2002 H. Peter Anvin - All Rights Reserved
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Followup to:  <Pine.LNX.4.33.0203141234170.1286-100000@scsoftware.sc-software.com>
By author:    John Heil <kerndev@sc-software.com>
In newsgroup: linux.dev.kernel
> 
> No, the better/correct port is 0xED which removes the conflict.
> 
> We've used 0xED w/o problem doing an embedded linux implementation
> at kernel 2.4.1, where SMM issues were involved. (It was recommended
> to me by an x-Phoenix BIOS developer, because of its safety as well as
> conflict resolution,
> 

Sorry, causes breakage on quite a few machines.  I used it briefly in
SYSLINUX.  Phoenix doesn't have that issue since they're part of the
platform, so they can make it a requirement for their BIOS.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt	<amsp@zytor.com>
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