???? readb(0x02f8) ????

looks like you try to do:
inb(0x02f8)
but with the wrong command.

readb reads from MEMORY-space
inb reads from IO-space

Please take a look at some/any driver code.
Even the rt_com.c module you tryed before 
uses this command. Please take closer look.

Jens Michaelsen
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