TMS320C6678: Software generated NMI not working.

I am trying to generate the NMI from software and it is not triggering. I have tried both the CSL: 

CSL_intcGlobalNmiEnable();

CSL_IPC_genNMIEvent(core);

and directly:

// NMIGR offset of corepac 0.
static const U32 NMIGR0 = 0x02620200;

CSL_intcGlobalNmiEnable();
*(reinterpret_cast<volatile U32*>(NMIGR0 + (4 * core))) = 1;

My latest try was to add 

Exception.nmiHook = '&dspExceptionHook';

to the cfg file. It already has 

var Exception = xdc.useModule('ti.sysbios.family.c64p.Exception');
Exception.exceptionHook = '&dspExceptionHook';

Any suggestions?