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: <475B7763.5000008@keyaccess.nl>
Date:	Sun, 09 Dec 2007 06:04:35 +0100
From:	Rene Herman <rene.herman@...access.nl>
To:	"David P. Reed" <dpreed@...d.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andi Kleen <andi@...stfloor.org>, 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 08-12-07 20:25, David P. Reed wrote:

> In any case, my machine does not have an ISA bus.  Why should it?  It's 
> a laptop!

A bus is not something with expansion slots. Your machine has an ISA bus, or 
LPC rather, if only to hang its BIOS of. That earlier report about BIOS 
chips shitting themselves due to aborts on LPC together with ACPI involving 
the BIOS sounds a bit suspicious (and in that case using 0xed shouldn't help 
any).

Rene.
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