I have a PCIe serial card in a Mac Pro based on the 16950 that's been working fine up until Yosemite. It's been working with the built-in Apple16x50Serial.kext driver.

With Yosemite, it looks like the driver loads okay, but no serial port appears under /dev/, and no IOBSDSerialClient for the card appears in ioreg either.

Anyone else have the same problem please let me know, or if you have a solution even better. :-)

Thanks