[MPC8260] accessing I/Os while MMU is off

[None Atall]

You missed a small shift... :)

-----------------------
li r16,r16,0x10
li r13, 0xf001
slw  r13,r13,r16
addis r13, 0x0d50
stw r14, 0(r13)
-----------------------

                   Dimitris.

--- vincent poirson <poirsonv at yahoo.fr> wrote:
>
> Hello,
>
> I want to change my PDATC value while in
> HardwareInterrupt code (in kernel/head.S) where MMU
> is
> off. So I simply do :
> li r13, 0x0d50
> addis r13, 0xf001
> stw r14, 0(r13)
> // where 0xf0010d50 is my PDATC adress and r14 the
> value I want to store
> I do not understand why my kernel crahes and goes in
> machine exception. Surprisingly, I can change PDATC
> with BDI2000 but not with assembler code. Is this an
> adress translation problem ?
> Am I missing something obvious ? Any help will be
> appreciated.
>
> Thanks in advance.
>
>
>


=====
------------------------------------------------------------
-Dhmhtrios Meidanis
-Degree in Mathematics, University of the Aegean.
-Master in Computer Architecture and Digital
 Systems, University of Crete.
 Greece.
------------------------------------------------------------


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