irq cleanup
    Cort Dougan 
    cort at persephone.cs.nmt.edu
       
    Wed Jan  6 08:06:48 EST 1999
    
    
  
Yelloknife has the same thing, but backwards.  That's jumper switchable
though.
}LongTrail CHRP has the output of the master i8259 routed through the OpenPIC.
}So it has 3 interrupt controllers:
}
}  - irq 0-7: master i8259	-> irq 16
}  - irq 8-15: slave i8259	-> irq 2
}  - irq 16-35: OpenPIC in Hydra	-> CPU
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