instruction fetch exception on c6457

Please take a look at the C64x+ CPU and Instruction Set Reference Guide, and find the section on C64x+ CPU Exceptions. You will find a listing of the various exception types and short descriptions of what can cause an exception to occur.

Of course, these are low-level reasons that explain for example what kind of fetch could generate an exception. The higher-level causes are varied. Program memory could be corrupted by a memory-device failure or by an errant data write operation, or the program counter could be executing from invalid memory where the noise values read are not valid instructions.

Regards,
RandyP

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I'm not sure if you're using DSP/BIOS or not, but this page is likely helpful either way:

http://processors.wiki.ti.com/index.php/DSP_BIOS_Debugging_Tips