AWR1642: Can MSS access DSS L2 memory?

Hi champion,
   My customer is developing their secondary boot loader on MSS, they use memcpy to copy DSP code to DSS L2 memory directly (address: 0x577E0000) but encounter exceptuion on MSS. Is this way correct?
   In TRM, I find below DSP L2 memory space address in MSS viewpoint, so it should be accessible from MSS in my mind. Could you help to check?

Thanks,
Adam