But 0 _is_ a valid PCI I/O address. Do we now have to start
I wasn't in PCI 2.1 (later the corresponding passage have
disppeared).
SFF controllers often use 0 to indicate a channel isn't configured and
present. Libata and old IDE both assume these semantics for an SFF
IDE device reporting address zero. It matches the hardware behaviour.
I would suggest you don't map one at I/O zero on your PCI.
That's of course the smarter choice, _if_ we have a choice at
all -- on PowerPC, the PCI setup on certain platforms is done
by the firmware (and we don't want to mess with it for various
reasons), and some _do_ map PCI legacy I/O at 0.
Not in this case though, so let's just ignore that possibility
until it hits us in the face :-)
Segher
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