Hello World Error...

[Till Straumann]

Hmm - I do not know that BSP at all.
However, a look at 'bspstart.c' reveals

 > void bsp_start( void )
 > {
 >   unsigned char *work_space_start;
 >   unsigned int  msr_value = 0x2030;
 >
 >   /*
 >    * Set BSP to initial value. Note: This value is a guess
 >    * check how the real board comes up. This is critical to
 >    * getting the source to work with the debugger.
 >    */
 >
 >   _CPU_MSR_SET( msr_value );


Probably, your MMU is not initialized and reading the
instruction following CPU_MSR_SET() (which enables the MMU)
crashes for lack of a valid address translation.

HTH
-- Till

Madhu Raju wrote:
>>===== Original Message From Joel Sherrill <joel.sherrill at oarcorp.com> =====
>>Madhu Raju wrote:
>>
>>>Hi,
>>>I have configured RTEMS for dmv177 bsp for powerpc.I did that succesfully.I
>>>downloaded a hello world application onto SVME/DMV-177 PowerPC 603e Single
>>>Board Computer using minicom.When i try to execute the application, I get 
>>
> the
> 
>>>following error:
>>>
>>>Exception 0400:  Instruction Access Exception
>>>      SRR0(pc) 00041A10   SRR1(msr) 10002030
>>>
>>>
>>>I found out from Hello.num and hello.dump that the instruction is
>>>
>>>000419ec T bsp_start
>>>
>>>Could anyone please help me solve this problem?
>>
>>I have no guesses but recommend using powerpc-rtems-objdump -da to find
>>out
>>what instruction is at 00041A10.  That would give a clue as to what
>>happened.
>>
>>One thing I do see is that the linkcmds assumes 32M of RAM.  If this
>>doesn't
>>match your board, it could be accessing non-existent memory.
>>
>>I haven't heard a report on this BSP in a long time.  Please keep us
>>posted.
>>
>>
>>>Thanks,
>>>
>>>Madhu
>>
> 
>  
> The instruction at 41A10 is
>  41a10:	80 87 00 04 	lwz	r4,4(r7)
>  
> Can the problem be guessed using this instruction information?
>  
> Thanks, 
> Madhu
> 
>