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: <4763001A.1070102@zytor.com>
Date:	Fri, 14 Dec 2007 14:13:46 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Pavel Machek <pavel@....cz>
CC:	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>
Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80
 on some AMD64x2 laptops, etc.

Pavel Machek wrote:
> On Fri 2007-12-14 10:02:57, H. Peter Anvin wrote:
>> Ingo Molnar wrote:
>>> wow, cool fix! (I remember that there were other systems as well that are 
>>> affected by port 0x80 muckery - i thought we had removed port 0x80 
>>> accesses long ago.)
>>> how about the simpler fix below, as a first-level approach? We can then 
>>> remove the _p in/out sequences after this.
>> I believe this will suffer from the issue that was raised: this will use 
>> udelay() long before loop calibration (and no, we can't just "be 
>> conservative" since there is no "conservative" value we can use.)
> 
> ?? Just initialize bogomips to 6GHz equivalent... and we are fine
> until 6GHz cpus come out.

How long will that take to boot on a 386?

	-hpa
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