> > A.  Check bit 0 of the status port and return 
> > 
> > B.  Check bit 4 or bit 9 of the interrupt control register
> > 
> > Without docs someone would need to play with the various combinations and
> > see what happened
> 
> Uhmmm, an idea would be to look in fd_mcs.c as that driver already has
> working support for irq-sharing.

Doh. 

Ok that indeed shows you check bit 0 if the status port.

Right I'll add shared IRQ support to that driver


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