Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 23 Jul 2001 13:04:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 23 Jul 2001 13:04:01 -0400 Received: from mailhub2.shef.ac.uk ([143.167.2.154]:5578 "EHLO mailhub2.shef.ac.uk") by vger.kernel.org with ESMTP id ; Mon, 23 Jul 2001 13:03:58 -0400 Date: Mon, 23 Jul 2001 18:04:02 +0100 (BST) From: Guennadi Liakhovetski X-X-Sender: To: Subject: PCI IDE initialization Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Original-Recipient: rfc822;linux-kernel-outgoing Hello I asked on kernelnewbies - no reply. So, trying here. I'm not subscribed, so CC would be greatly appreciated. Somewhere in the background of my mind I am still trying to solve 'nicely' the problem with my machine - no kernel since 2.0.39 can turn IDE bus-mastering (IDE DMA) on it on. I have an ugly hack for 2.4.0, which works, but it's ugly - it should never be run on other machines. The problem with the newer kernels is that they fail to calculate IDE dma_base address correctly. So, in my ugly patch I just hard-coded the values (for ide0 and ide1) obtained from 2.0.39. And I am still hoping for a nicer solution. My guess (partly supported by studying the sources) is that 2.0.39 kernel used some BIOS-provided values, whereas 2.2 and 2.4 kernels use some ad hoc knowledge about various chipsets, and my chipset somehow, although it's a simple Triton PIIX has it differently... Anyway, for now I would really appreciate if somebody could shed some light on the PCI IDE initialization path in 2.0(.39) vs 2.2/2.4, if indeed 2.0 reads the value set by BIOS, whereas 2.2/2.4 clears those values (I tried reading the same address - clean) somewhere during bus initialization, where in the code does this happen - if my assumption is right, if not - what could be happening? I am hoping to read those values somewhere before the bus initialization, preserve them, and allow them to be used later if everything else fails. Thanks Guennadi ___ Dr. Guennadi V. Liakhovetski Department of Applied Mathematics University of Sheffield, Sheffield, U.K. email: g.liakhovetski@sheffield.ac.uk - 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/