I'm told my Sri, the original author of the cx231xx driver, to prod the board definition carefully and take a close look at pre_card_setup.
I'm not sure what exactly I'm looking for or what I'm doing, but I'm tracing down every single thing called by everything. I am not getting EPIP errors tho, so I either fixed that or haven't encountered it yet. Sri's advice to that was stop sending i2c messages that devices aren't replying to.
I was also told to request a PAE from Conextant for the chipset. I have no idea what that means but hopefully it's something along the lines of a product datasheet. I'll post it here when I get it.