Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933084AbXLQVVs (ORCPT ); Mon, 17 Dec 2007 16:21:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759223AbXLQVVi (ORCPT ); Mon, 17 Dec 2007 16:21:38 -0500 Received: from terminus.zytor.com ([198.137.202.10]:51643 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755628AbXLQVVh (ORCPT ); Mon, 17 Dec 2007 16:21:37 -0500 Message-ID: <4766E765.4080006@zytor.com> Date: Mon, 17 Dec 2007 13:17:25 -0800 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.9 (X11/20071115) MIME-Version: 1.0 To: "David P. Reed" CC: Rene Herman , Ingo Molnar , Paul Rolland , Alan Cox , Pavel Machek , Thomas Gleixner , linux-kernel@vger.kernel.org, Ingo Molnar , rol@witbe.net Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override. References: <4762C551.5070003@zytor.com> <20071214210652.GB28793@elf.ucw.cz> <4763001A.1070102@zytor.com> <20071214232955.545ab809@the-village.bc.nu> <20071215080831.404cdb32@tux.DEF.witbe.net> <47638C8C.2090604@gmail.com> <476438B4.2020600@zytor.com> <476462BE.3030701@gmail.com> <4764687D.6080609@zytor.com> <476524DB.7020806@gmail.com> <20071216152250.GA21245@elte.hu> <4765D43E.1010800@gmail.com> <4765D95C.4010404@zytor.com> <4765DCB0.8030901@gmail.com> <4765EE7F.80002@zytor.com> <47667366.7010405@gmail.com> <4766AE88.4080904@zytor.com> <4766D175.7040807@reed.com> <4766D443.6040805@zytor.com> <4766E3DC.50700@reed.com> In-Reply-To: <4766E3DC.50700@reed.com> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 769 Lines: 19 David P. Reed wrote: > > Note that I can run the port 80 test once, the second time I get the > hard freeze. I didn't try writing to port 70 from userspace - that > one's dangerous, but the reading of it was included for a timing typical > of a chipset supported device. These are all pretty consistent. > > I find the "read" timing from 0x80 verrrrry interesting. The write > timeing is also interesting, being faster than an unused port. > Once again: reading from port 0x80 goes to the DMA page device. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/