From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261982AbULKRug (ORCPT ); Sat, 11 Dec 2004 12:50:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261992AbULKRud (ORCPT ); Sat, 11 Dec 2004 12:50:33 -0500 Received: from clock-tower.bc.nu ([81.2.110.250]:63964 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S261982AbULKRuQ (ORCPT ); Sat, 11 Dec 2004 12:50:16 -0500 Subject: Re: PCI IRQ problems -- update From: Alan Cox To: Jim Paris Cc: Linux Kernel Mailing List In-Reply-To: <20041211173538.GA21216@jim.sh> References: <20041211173538.GA21216@jim.sh> Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1102783555.7267.37.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Sat, 11 Dec 2004 16:45:57 +0000 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sad, 2004-12-11 at 17:35, Jim Paris wrote: > In short, all PCI IRQs are routed via ACPI to PIC IRQ 9. When the > PIIX IDE device is enabled, it pulls on that interrupt until it gets > disabled ("nobody cared"). ide0 then continues to work on IRQ 14, but > all other devices are broken since IRQ 9 is disabled. The PIIX should be in legacy mode by default in which case it would be on IRQ 14/15 only. Can you post boot messages ? > I'm not sure how to get to the root cause of the problem, though. For > starters: where _should_ the INTA of the IDE card go, if anywhere? If Quite possibly nowhere. IDE controllers have two modes one in which they are normal PCI devices (and use INTA) and one in which they are "legacy" compatible and use IRQ14/15 directly so they work with pre-PCI operating systems. > my laptop's IDE is routed to and pulling on IRQ 9, how can it still be > functioning on IRQ 14? Or, if the routing doesn't matter, is there > anything I can do to prevent it from pulling on 9? In legacy mode (the mode I would expect at boot) it shouldn't be using INTA at all.