>>> 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 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
