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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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