Device-tree bugs on js20 with some versions of SLOF were causing the
interrupt for IDE to not be parsed correctly and fail to boot. This
patch adds a bit more sanity checking to the parser to detet some of
those errors and fail instead of returning bogus informations. The
powerpc PCI code can then trigger a fallback that works on those
machines.

Quite similar to my patch you have been refusing, so I'll just

ACK

it, irrespective of if we need it or not (anymore) -- it's a good,
useful, cheap sanity check.  The patch looks good, too.


Segher