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How to shutdown properly DM6446 ?

After playing video stuffing (recording, saving images...) with DM6446, I  have noticed that when I restart our electronic box containing DSP, the DM6446 seems not to respond...

How can I be sure that my DM6446 has been shutdown properly and how the DM6446 has been reset properly durint the booting...

Is there a special command line or function to shutdown properly the DM6646 ?

Is there a way to check DM6446 status ?

For your information, I am working with Linux 2.6.32 (ARMV5TEJL), DVSDK 2.00.00.22 and DM6446 Rev 1.1.