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arminterruptcortex-a

ARM Cortex-A9 Software generated interrupt only triggered once

I'm working with ARM Cortex-A9 in a Zynq7020 and having problem with software generated interrupts.

When I generate (writing to the ICDSGIR register) a SGI in core ARM1 it is only triggered once and not again, more writes to ICDSGIR does not trigger the interrupt.

Generating a SGI in core ARM0 sent to ARM1 works fine but not ARM1 to ARM1.

Is there any special handling needed for SGI in the ISR? What could I have missed in the configuration?

Solution

  • You probably should mark the end of interrupt by writing the interrupt ID along with the target processor to the ICCEOIR register:

    ICCEOIR register