Re: query regarding access of physical memory from user space

Hi

Some more doubts about the same thing.

As I am aware, the MPC8260 does not have a separate
I/O address space. 

Yes,The MPC8260 I/O address space is mapped into 
the Processors address space itself i,e the 256 Kb
Internal memory which can be located anywhere in the
4 GB adress space using the IMMR register

So,
with reference to my earlier mail, when do we need to
use ioremap() and when
do we need to use request_mem_region()? Or do we need
to use both in a
particular sequence?

For the MPC8260 you can access the I/O region  
directly without an need for mapping.U can access 
it thru the IMMR base address value.And specific 
registers can be accessed by adding the register 
offset to this value

Also, if I just do an ioremap(), can I directly access
those remapped
addresses with inb()/outb() or writeb()/readb()? Or is
something more to be
done prior to accessing it?

u dont have to do an ioremap

Regards

Vijay Padiyar

http://www.vijaypadiyar.eu.tf




		
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