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: <20071211193654.GE3437@elf.ucw.cz>
Date:	Tue, 11 Dec 2007 20:36:54 +0100
From:	Pavel Machek <pavel@....cz>
To:	"David P. Reed" <dpreed@...d.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Rene Herman <rene.herman@...access.nl>,
	Paul Rolland <rol@...917.net>,
	David Newall <david@...idnewall.com>,
	"H. Peter Anvin" <hpa@...or.com>, Krzysztof Halasa <khc@...waw.pl>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, rol@...be.net
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64
	with MCP51 laptops

Hi!

> a spec sheet, or even better a machine.   I may have an original PC-XT 
> still lying around in the attic, don't know if I can fire it up, but it had 
> such graphics cards.  I also have several early high-speed clones that were 
> "overclocked".

PC-XT does not count ... it needs to be 386 capable to
count... Hmm.. but we have ucLinux now, so maybe PC-XT does count.

>> Which requires care. Have you verified all the main chipset vendors ?
>>
>>   
> I obviously have not.   Clearly the guys who want this port 80 hack so 
> desperately have not either.  That's why we are in this pickle.

Noone _wants_ this port 0x80 hack. We already have it, had it for 10+
years, and now we are trying to get rid of it -- _safely_.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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