newb: How to turn off cache for OMAP DSP?

Cant seem to get past IPCstart() when I try to disable cache for a shared mem region set up statically using:

var SHAREDMEM0           = 0xc2000000;
var SHAREDMEMSIZE0       = 0x00310000;
SharedRegion.setEntryMeta(0,
    { base: SHAREDMEM0,
      len:  SHAREDMEMSIZE0,
      ownerProcId: 1,
      isValid: true,
      name: "shared0",
      createHeap: true,
      cacheEnable: false,
    });

This is the common setup for both DSP and ARM cores, where the owner is the DSP...both cores are running SYSBIOS...

What is the proper way to disable caching for a shared mem region ?