> > What would be the best way to go about this?  The current dev/ic/com.c
> > is written using bus_space routines and bus_space_tag and _handle
> > pointers, of course.
>
>Yes.  The best approach is probably to define a local bus with
>bus_space functions that allow bus_space_read/write_X() to work
>properly when accessing the MPC8245 UART.
>
Since you can access them directly:
the other way round is to directly access the registers which consumes less 
time by defining some macros:

#define	  REGVAL(x)               *((__volatile uint32_t *)((x)))

where "x" will be the address of the register. You can use it for both load 
and store values to the register address.

-Anand

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