On Tue, 2008-03-04 at 21:39 +0100, Segher Boessenkool wrote: > >> Using '8' is correct. PCI interrupts are *always* level sensitive and > >> active > >> low. > > > > Unless you use one of those strange bridges that stick not gates on the > > PCI IRQ inputs :-) But I don't think that's the case on the 440EP. > > More generally, the target interrupt descriptors (sense values, in > particular) in a device tree interrupt map describe the interrupts as > seen on the target interrupt controller, *not* as seen on this (source) > interrupt domain. This should be obvious, but since the source > interrupt > descriptor for PCI doesn't have a sense value (it's always level low, > after all), it can be confusing. Well, interrupts always are confusing > :-)
Sure. But if your stupid bridge sticks a not gate between the PIRQ input and the UIC (interrupt controller), effectively, the UIC sees a reversed polarity. Thus you need to put in your interrupt map a reversed polarity information for the UIC interrupt specifiers. Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
