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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Date:	Sat, 15 Dec 2007 08:08:31 +0000
From:	Paul Rolland <rol@...917.net>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Pavel Machek <pavel@....cz>,
	Ingo Molnar <mingo@...e.hu>, "David P. Reed" <dpreed@...d.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Rene Herman <rene.herman@...access.nl>, rol@...be.net
Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on
 some AMD64x2 laptops, etc.

Hello,

On Fri, 14 Dec 2007 23:29:55 +0000
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> On Fri, 14 Dec 2007 14:13:46 -0800
> "H. Peter Anvin" <hpa@...or.com> wrote:
> 
> > Pavel Machek wrote:
> > > On Fri 2007-12-14 10:02:57, H. Peter Anvin wrote:
> > 
> > How long will that take to boot on a 386?
> 
> Well the dumb approach to fix that would seem to be to initialise it to
> 
> 	cpu->family   3 -> 50MHz 4 -> 300Mhz 5-> etc...

Just an idea : from what I've read, the problem (port 80 hanging) only occurs
on 'modern' machines... So why not :
 - use port 80 for old CPUs (PII, PIII) where it has never really been
   a problem,
 - use the cpu->family to do a best match for CPU freq
thus we could avoid increasing boot time too much...

Paul


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