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TMS320DM648: Restricted Control Register access.

Part Number: TMS320DM648


My customer started development with the DM648.

He previously used the C6202 / C6413, and chose the DM648 to upgrade them.

He was trying to port code based C6413, but DM648 has difference between C64x+ and C64x.

After reset, DM648 is in supervisor mode. So I think the control register are available for access in supervisor mode.

But I can't write to CSR. 

when the below line is executed, it is not actually reflected

CSR |= 0x00000001;

Is there something else for control register access?