From: "Art Wildman" <Art.Wildman@noaa.gov>
To: Jing Xu <xujing_cn2001@yahoo.com>
Cc: linux-config@vger.kernel.org
Subject: Re: irqmask doesn't work
Date: Mon, 01 Dec 2003 10:46:53 -0500 [thread overview]
Message-ID: <3FCB626D.3060307@noaa.gov> (raw)
In-Reply-To: <20031126215145.61830.qmail@web41307.mail.yahoo.com>
Try 'man sysctl'
http://www.redhat.com/docs/manuals/linux/RHL-7.3-Manual/ref-guide/s1-proc-sysctl.html
Sometimes it is more difficult to juggle these things in software than to make
sure the machine is doing PnP properly. USB is a 'WinTel' standard & broken on
many older motherboards. Check your BIOS for updates and settings to make sure
Plug-n-Play is enabled, legacy IRQs are not reserved. Sometimes moving a card
from one PCI slot to another enables PnP to overcome conficts, in redhat 'kudzu'
should detect changes. -Art@JAX
Jing Xu wrote:
> Hello,
>
> I'm having some trouble with PCI IRQ's and I was
> hoping someone here could help.
>
> 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 the above irqs used by USB
> devices. I figured it would be a good idea to remove
> this apparent conflict. I have scoured the web and
> found that I can reserve these IRQs by specifying
> pci=irqmask=0xxxxx on the kernel boot line.
>
> I have tried to set "pci=irqmask=0xf1e8" to reserve
> Irq 9 10 11 4 from my driver, and it hasn't had any
> effect - those irqs are still used by usb controllers
> on initialization.
>
> How do I change these IRQ's? Is there some other
> configuration file I haven't found? If anyone can
> provide any insight into this, I would appreciate it
> greatly. Let me know what/if any details you need - I
> am by no means an expert in this area and didn't want
> to post reams of irrelevant information, but if there
> is something I'm missing let me know and I'll get
> it...
>
> Thanks in advance,
>
> jing
prev parent reply other threads:[~2003-12-01 15:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-26 21:51 irqmask doesn't work Jing Xu
2003-12-01 15:46 ` Art Wildman [this message]
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