This is a follow up to the 'Allow for replaceable I/O functions in 8250 driver' patch I sent yesterday. I hope it addresses the issues raised by Alan Cox and Arnd Bergmann. The four parts of the patch are as follows: 1/4) Add replaceable I/O functions to the 8250 driver. This allows platform specific register access code to be moved out of the driver into the platform support files. 2/4) Add a new port flag UPF_FIXED_TYPE that allows callers of serial8250_register_port() to specify the port type and disables probing. 3/4) Add a 'bugs' field to the serial8250_config. Used in conjunction with 2/4, this allows the bugs flags to be set without probing. 4/4) Add an entry to uart_config for PORT_OCTEON describing the OCTEON's internal UARTs. Two new bug flags are defined to account for PORT_OCTEON's peculiarities. Comments welcome, David Daney