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driver problem



Hi everybody,
 
I am trying to connect another controller to my board using address and data bus
I have programmed an address range to enable chip select.
but I do not know, how to write a device driver for this
(I  wrote some example character devices before )
 
becouse, I want to access my driver using pointers
 
example :
 
I've  selected address a0000000 with 32 kb range for chip selects (a0000000 is not in my RAM range)
now, i want to access this address using pointers but linux is giving "memory fault" becouse it is not defined and i don't know how to define it
 
 
If anyone could help me, that would be of great help.
 
Yigit Can