From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261460AbTLHTmJ (ORCPT ); Mon, 8 Dec 2003 14:42:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261506AbTLHTmJ (ORCPT ); Mon, 8 Dec 2003 14:42:09 -0500 Received: from fmr04.intel.com ([143.183.121.6]:24008 "EHLO caduceus.sc.intel.com") by vger.kernel.org with ESMTP id S261460AbTLHTki (ORCPT ); Mon, 8 Dec 2003 14:40:38 -0500 Subject: Re: irq again From: Len Brown To: Jing Xu Cc: linux-kernel@vger.kernel.org In-Reply-To: References: Content-Type: text/plain Organization: Message-Id: <1070912434.2408.50.camel@dhcppc4> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.2.3 Date: 08 Dec 2003 14:40:34 -0500 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org If the Dell has an IO-APIC, you want to build support for it into the kernel -- doing so may free up some additional interrupt lines. If you can upgrade to the 2.4.23 kernel and run in ACPI mode, then there are a couple of knobs that might be able to help you. acpi_irq_balance ACPI will balance active IRQs acpi_irq_nobalance ACPI will not move active IRQs acpi_irq_pci= If irq_balance, Clear listed IRQs for use by PCI acpi_irq_isa= If irq_balance, Mark listed IRQs used by ISA acpi_irq_balance is default in IOAPIC mode acpi_irq_nobalance is default in PIC mode the acpi_irq_[pci, isa] are to list specify IRQs that should, and should not be used for PCI interrupts, respectively. cheers, -Len ps. Might also try to disable USB in the BIOS and use a PS/2 keyboard to free up the IRQs? On Mon, 2003-12-08 at 13:58, Jing Xu wrote: > Hi, guys, > > I have been stuct on this problem for a long time. Any > suggestion on this will be highly appreciated. > > I'm running linux 2.4.20 and rtai 24.1.11. My linux > kernel module needs to use IRQ 9 10 11 for AGP graphic > card, sound card and PCI-Dio24 IO card. These irqs are > also shared by USB controllers. My module hangs when > it tries to request one of the above irqs that is used > by USB keyboard. > > I am using DELL machine, and its bios cannot reserve > irq's. > > I also tried to set boot paramter "pci=irqmask=0xf1ef" > to reserve irqs 9 10 11 4 for my driver, and it hasn't > had any effect - those irqs are still used by usb > controllers on initialization. > > How to solve this irq confliction problem? > > Thanks in advance, > > jing > > __________________________________ > Do you Yahoo!? > New Yahoo! Photos - easier uploading and sharing. > http://photos.yahoo.com/ > - > 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/ > >