How debug secured C6748 with DSP BIOS based application when exit mode is SECUREWITHSK

Hi, we using generic secured C6748 for our project.

1.  I experience an issue with debugging DSP BIOS based application when exiting in SECUREWITHSK boot exit mode.

2.  I have no problem with debugging the above application when exiting in NONSECURE boot exit mode.

3.  I have no problem with debugging application without DSP BIOS when exiting in SECUREWITHSK or NONSECURE boot exit mode.

4.  I opened(unsecured) all MPUs and IOPUs.

5.  In the scenario with DSP BIOS I noted that if I use "bios.GBL.USERINITFXN" (which is empty and do nothing for the test) option than the application stuck in the init routine.

     From that I conclude that DSP get reset all the time, but I can't understand why.

     I looked in "FLTSTAT" (value = 0x0E030210) register of the MPU2 and noted following :

1. Supervisor write fault (10h).
2. Privilege ID = DSP (1h).
3. Master ID = DSP CFG (3h).