NOR flash and map_info

1. what is differ between field buswidth (struct map_info) kernel 2.6.9 and field called `bankwidth' kernel 2.6.13 ?

2. i have 8 bit NOR chip compatable with Intel StrataFlash. The address access is paged. is any generic routine in MTD for counting address?

3. if my flash is 8bit (buswidth is 1), so it is mean i have to implement only simple_read8 and simple_write8 functions (kernel 2.6.9)?