Mysterious exceptions

Hello!

I have a Wuerz board with MPC565. I wrote an RTOS myself.
I now flashed an application program and I began (again) to receive 
spurious exceptions. It seems my program somewhere goes astray and it 
doesn't start the application as expected. I put some code to the OS 
itself to cause an exception, and the result is that if I put this 
code than it is executed, I see it in the exception log window (2nd 
serial port), but when I remove it it seems the code is not executed.
(I cannot describe it better since I don't have a debugger)
I suspected the exception handler or the interrupt handler have bug, 
but this problem never occured for ages, and came up again when I 
reorganised the initialisation sequence in the OS.

MOREOVER, If I attach the wiggler cable to the BDM port, and start the 
mccraigor OCDaemon program, then the problem never occures!!! Even if 
I don't use the program at all!
The difference is being the cable connected and not connected is that 
the wiggler pulls the DSCK pin high with -SRESET causing the processor 
to enable debug mode. I saw it on an oscilloscope.
The OS anyway tries to disable the debug mode via resetting all bits 
in the DER.

My question is that what is the side effect of the cable being 
connected? What happens inside the RCPU if the cable is connected?

(The moment 22 is that If I attach the cable to run ocdaemon, then the 
problem never happens. If I detach it and attach it after reset then 
the problem occures but I'm not able to halt the program.)

Any ideas??

Best regards
Attila






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