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IRQ and 21554.

 I am using a 21554 as Pci Bridge.
 I use software IRQ of the 21554 to exchange IRQ between the 
 primary and the
 scondary side of the 21554.
 But on the secondary side, I have got IRQ that comes from a 
 PMC. As this IRQ
 is connected on the s_int_a of the 21554 it goes through the 
 bridge and I
 found my IRQ on the primary bus.
 Is it possible to prevent this ?
 I want the PMC IRQ to be seen only by the secondary side, I 
 can't connect my
 PMC IRQ on int_b, int_c or int_d, I need the 21554 to allow 
 the software