Allow the interrupt allocated to the PCIC to be tuned from the kernel environment by setting the variable machdep.pccard.pcic_irq.  If the IRQ is invalid, the PCIC will run in polled mode.
Allow the interrupt allocated to the PCIC to be tuned from the kernel
environment by setting the variable machdep.pccard.pcic_irq.  If
the IRQ is invalid, the PCIC will run in polled mode.

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