Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 30 Apr 2001 11:39:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 30 Apr 2001 11:39:21 -0400 Received: from dutidad.twi.tudelft.nl ([130.161.158.199]:21900 "EHLO dutidad") by vger.kernel.org with ESMTP id ; Mon, 30 Apr 2001 11:39:06 -0400 Date: Mon, 30 Apr 2001 17:39:04 +0200 From: "Charl P. Botha" To: Alan Cox Cc: linux-kernel@vger.kernel.org Subject: Re: pci/quirks.c - VIA PCI latency in 2.4.4 Message-ID: <20010430173904.A8741@dutidad.twi.tudelft.nl> Reply-To: "Charl P. Botha" In-Reply-To: <20010430155844.E8052@dutidad.twi.tudelft.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: ; from alan@lxorguk.ukuu.org.uk on Mon, Apr 30, 2001 at 03:33:49PM +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 30, 2001 at 03:33:49PM +0100, Alan Cox wrote: > > No fix is known for intel pci-to-host bridges with the 686B south bridge, > > and in the case of the AMD-761 chipset, there are certain BIOS settings you > > can change. See: http://home.tiscalinet.de/au-ja/review-kt133a-4-en.html > > The -ac tree has the ability to kill IDE DMA across the entire system. It may > be this is what should be done with all hybrid setups where there is no known > fix. Alternatively, too much time shouldn't be spent on this specific bug. VIA has recognised it, and motherboard vendors are already starting to release updated BIOSes that sport the required settings (e.g. Abit, see http://www.viahardware.com/faq/kt7/faqbios.html). I'm just afraid if the kernel starts disabling IDE DMA on certain of these setups, there'll have to be checks (in the kernel) for possible future updated BIOSes as well (else we disable IDE DMA where it's not necessary). Selective application of the fix (as in my patch) does no harm on the known combinations though. My very humble 2c, -- charl p. botha | computer graphics and cad/cam http://cpbotha.net/ | http://www.cg.its.tudelft.nl/ - 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/