>And couldn't we detect IRQ used by a PCI card, just like the  
>detect them with ISA cards ?

Not really.  PCI allows shared IRQs which rather knocks on the head any hope 
of being able to reliably probe for them.  Autoprobing IRQs never worked 
properly for ISA systems anyway and one of the advantages of PCI is that it 
provides a way to avoid this.  Going back to relying on autoprobe would 
definitely be a retrograde step.

p.


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