Re: irqmask doesn't work

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