Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757561AbYAAVqb (ORCPT ); Tue, 1 Jan 2008 16:46:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754701AbYAAVqY (ORCPT ); Tue, 1 Jan 2008 16:46:24 -0500 Received: from smtpq2.tilbu1.nb.home.nl ([213.51.146.201]:41634 "EHLO smtpq2.tilbu1.nb.home.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754693AbYAAVqX (ORCPT ); Tue, 1 Jan 2008 16:46:23 -0500 Message-ID: <477AB3DC.9080705@keyaccess.nl> Date: Tue, 01 Jan 2008 22:42:52 +0100 From: Rene Herman User-Agent: Thunderbird 2.0.0.9 (X11/20071031) MIME-Version: 1.0 To: Christer Weinigel CC: Ingo Molnar , Alan Cox , "David P. Reed" , "H. Peter Anvin" , Rene Herman , Paul Rolland , 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: <47667366.7010405@gmail.com> <4766AE88.4080904@zytor.com> <4766D175.7040807@reed.com> <20071217212509.5edaa372@the-village.bc.nu> <477A634C.8040000@reed.com> <20080101161557.3ce2d5f8@the-village.bc.nu> <20080101164338.GA901@elte.hu> <20080101183238.74307174@weinigel.se> <20080101184659.GA9250@elte.hu> <20080101203518.26e889f2@weinigel.se> <20080101210143.GB759@elte.hu> <20080101224241.2ce431bd@weinigel.se> In-Reply-To: <20080101224241.2ce431bd@weinigel.se> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -1.0 (-) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 766 Lines: 20 On 01-01-08 22:42, Christer Weinigel wrote: > The data sheet for the Intel M8259A says: > > End of /RD to Next Command: 300 ns > End of /WR to Next Command: 370 ns > > On the other hand, I don't know how all the i8253/i8259 clones or the > numerous variants of Super I/O chips behave. It wouldn't surprise me > if some Super I/O chip uses the ISA bus clock to latch the values > internally so that the delay is dependent on the bus frequency instead. I wouldn't even be surprised if most all would... Rene. -- 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/