Arm Development Studio forum Cortex-A9 cant enter monitor mode

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Cortex-A9 cant enter monitor mode

Note: This was originally posted on 20th July 2012 at http://forums.arm.com

Hi,

I am using pandaboard with Cortex-A9MP (2x Cortex-A9) and connect to processor_0 by JTAG and Lauterbach hardware debugger.
When i try to change from system mode to monitor mode by change of CPSR mode bits, i get an debugger error "Emulator function blocked by device security".
When i execute the ARM instruction "smc 1", nothing happens.
The "Secure Configuration Register" and "Secure Debug Enable Register" cannot be read and are marked as "???????" by the debugger, which indicates i am in non-secure mode.

My question: What might block monitor mode access?

Greets
Sebastian