> > There is one pending problem: the M8xx does not accept > access to non present ioports (an exception is triggered), > which is quite common while inserting/removing cards. > > We've hacked around this in our tree, Panto once mentioned > that another PPC's do handle those exceptions fine (?). >
Ah yes, I remember this problem from the 68360 days. This is a matter of how you set up the option register ORx for a particular chip select. You can choose external or internal acknowledge. You can have both at the same time: if you set up the ORx for the maximum number of wait states and also select external acknowledge, the cycle will end with the external acknowledge, or end with the maximum wait states if no external ack is generated. Also note that the internal/external ack bit can be changed on the fly - so, for instance, you could turn external ack on once a card was inserted. As I recall, some PCMCIA cards can have VERY long cycles in the configuration space, so even the maximum number of wait states in ORx may not be sufficient. Mark Chambers
