linux-kernel - Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.

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Message-ID: <Pine.LNX.4.64.0712172349280.32270@fbirervta.pbzchgretzou.qr>
Date:	Mon, 17 Dec 2007 23:50:30 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	"David P. Reed" <dpreed@...d.com>,
	"H. Peter Anvin" <hpa@...or.com>, Pavel Machek <pavel@....cz>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Rene Herman <rene.herman@...access.nl>
Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on
 some AMD64x2 laptops, etc.


On Dec 15 2007 17:46, Alan Cox wrote:
>
>> 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.

Computers without a PC BIOS (I'm trying to think of something, e.g.
the typical SUN sparc64 box) should have other means of accessing a
clocksource, no?
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