Possible pci conflict

[Donald Becker]

On Tue, 12 Oct 1999, Serena Del Bianco wrote:

> In my pentium 133 (kernel 2.2.4) the realtek is working ok, but in my
> pentium II (kernel 2.3.21) i think i'm having a pci conflict: my
> ps/2 mouse and the rtl8139 are using the same IRQ (12). 
>
> I've read this article at
> http://cesdis.gsfc.nasa.gov/linux/misc/irq-conflict.html

Good -- it's difficult to remain in good humor when I answer the same
question for the zillionth time when the answer is on a web page.

> i've checked the BIOS and the "PNP OS" feature is disabled, also i
> disabled the IRQ12 in the bios but for what understood (Busmouse how-to)
> it's impossible to change the IRQ on the ps/2 mouse.

Yes, the PS/2 mouse is always on IRQ12.  I don't know if it can be
PCI-shared or not -- likely only the BIOS knows.

> I also tried to compile the driver as a module but since PCI cards do not
> select their own IRQ line, i think it's the same to have the
> driver compiled as module or built on the kernel... Am i wrong?

Correct.  If its a problem as a module, building it in won't fix the
problem.  (Unless it loads the rtl8139 driver before the mouse driver, but
then the mouse driver will have a problem.)

Either make an additional IRQ available for PCI devices, or figure out how
to change the PS/2 driver to do SA_SHIRQ.

> All the suggestions are welcome
> 
> TIA
> 
> Serena Del Bianco
> 
> 
> 
> 
> 
> 
> 
> 
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Donald Becker					  becker@cesdis.gsfc.nasa.gov
USRA-CESDIS, Center of Excellence in Space Data and Information Sciences.
Code 930.5, Goddard Space Flight Center,  Greenbelt, MD.  20771
301-286-0882	     http://cesdis.gsfc.nasa.gov/people/becker/whoiam.html

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