Message-ID: <47596A2E.4060602@keyaccess.nl>
Date: Fri, 07 Dec 2007 16:43:42 +0100
From: Rene Herman <rene.herman@keyaccess.nl>
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To: Andi Kleen <andi@firstfloor.org>
CC: "David P. Reed" <dpreed@reed.com>, linux-kernel@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
       "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64
 with MCP51 laptops
References: <475879CD.9080006@reed.com> <p733auekcly.fsf@bingen.suse.de> <47595DB2.5080302@reed.com> <20071207145430.GA5992@one.firstfloor.org>
In-Reply-To: <20071207145430.GA5992@one.firstfloor.org>
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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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