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: <20071209132258.GG4381@ucw.cz>
Date:	Sun, 9 Dec 2007 13:22:58 +0000
From:	Pavel Machek <pavel@....cz>
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 Sat 2007-12-08 14:25:02, David P. Reed wrote:
> 
> 
> Alan Cox wrote:
> >
> >0x80 should be fine for anything PC compatible anyway, 
> >its specifically
> >reserved as a debug port and supported for *exactly* 
> >that purpose by
> >many chipsets.
> >
> >  
> Disagree. The definitions of PC compatible are quite 
> problematic.   I have the advantage over some of you 
> young guys, in that I actually wrote code on one of the 
> first 5 breadboard IBM PCs on the planet at Software 
> Arts, Inc. and I was directly involved in hardware spec 
> projects with the original IBM and Compaq engineers.  No 
> one actually defined the port numbered 80h as a 
> "standard" for anything.  You won't find it documented 
> in any early manual for an IBM machine.
> 
> The ISA bus supported unterminated transactions safely.  
> That allowed some clever folks to design BIOS diagnostic 
> tools that optionally plugged into the bus.
> 
> In any case, my machine does not have an ISA bus.  Why 
> should it?  It's a laptop!

There are mini-pci based cards with port 0x80 displays for notebooks.

							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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