Date: Sat, 15 Dec 2007 17:46:58 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "David P. Reed" <dpreed@reed.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Pavel Machek <pavel@ucw.cz>,
       Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
       linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
       Rene Herman <rene.herman@keyaccess.nl>
Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on
 some AMD64x2 laptops, etc.
Message-ID: <20071215174658.5d784075@the-village.bc.nu>
In-Reply-To: <47640C33.1050106@reed.com>
References: <469578CD.3080609@reed.com>
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	<1184218962.12353.209.camel@chaos>
	<46964352.7040301@reed.com>
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	<469697C6.50903@reed.com>
	<1184274754.12353.254.camel@chaos>
	<4761F193.7090400@reed.com>
	<20071214131502.GA14359@elte.hu>
	<4762C551.5070003@zytor.com>
	<20071214210652.GB28793@elf.ucw.cz>
	<4763001A.1070102@zytor.com>
	<20071214232955.545ab809@the-village.bc.nu>
	<4763442A.5020507@reed.com>
	<476369E2.8050301@zytor.com>
	<47640C33.1050106@reed.com>
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> My understanding is that the linux starts in real mode, and uses the 
> BIOS for such things as reading the very first image.   

Not always. We may enter from 32bit in some cases, and we may also not
have a PC BIOS in the first place.
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