linux-kernel - Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

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Message-ID: <47596A2E.4060602@keyaccess.nl>
Date:	Fri, 07 Dec 2007 16:43:42 +0100
From:	Rene Herman <rene.herman@...access.nl>
To:	Andi Kleen <andi@...stfloor.org>
CC:	"David P. Reed" <dpreed@...d.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64
 with MCP51 laptops

On 07-12-07 15:54, Andi Kleen wrote:

>> My machine in question, for example, needs no waiting within CMOS_READs 
>> at all.   And I doubt any other chip/device needs waiting that isn't 
> 
> I don't know about CMOS, but there were definitely some not too ancient
> systems (let's say not more than 10 years) who required IO delays in the
> floppy driver and the 8253/8259. But on those the jumps are already
> far too fast.

Also see Alan's replies in the thread I posted a link to:

http://linux.derkeiler.com/Mailing-Lists/Kernel/2003-09/5700.html

Also 8254 (PIT) at least it seems.

Rene.
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