Re: [Madwifi-users] Force madwifi to use another irq

[Michael S. <mi...@sc...>]

On Sun, Jan 18, 2004 at 12:36:34PM -0800, Vladimir G. Ivanovic wrote:
> Is this of any help? [from bootparam(7)]:
[...]
> 
>              ether=0,0,eth1
> 
>       Note  that  the  values  of  zero for the IRQ and I/O base in the above
>       example tell the driver(s) to autoprobe.

Probably not. First, this applies only to boottime configuration and not to
hot-pluggable devices, second, this is only useful for ISA or similar cards
where the driver needs to know the interrupt which the hardware uses, and
the hardware can't tell the driver, and third, with PCI/Cardbus, there would
be no use in telling the driver to use interrupt 5, if the interrupt line
from the card is still routed to the interrupt controller in a way that
causes interrupt 3 when active.

The combination of mainboard chipset, PCI->cardbus bridges, and how the BIOS
sets them up, determines what interrupt number the card gets - the card can
do nothing about this, it simply has one[1]interrupt line and must live with
the routing that is supplied by BIOS/mainboard/kernel, so you need to
twiddle at *that* point if you want/need to change the routing.

cu
Michael

[1] for single-function PCI/cardbus devices
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