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About the functionality of MPU in C6678

Allen Lee
Genius 3770 points
Other Parts Discussed in Thread: TMS320TCI6616

Hi All,

I reviewed the functionality of MPU, and it's confused that whether it can be utilized to protect the general memory such as MSMCRAM or DDR3?

I had a test on that, first configure the MPPA register to setup a protected region(in my test, 0x0C000000~0x0C001000 as example), and marked all the masters(AID0~AID15) as "Access denied" to this region through the PROGn_MPPA register. Then I triggered a EDMA transfer to write data to 0x0C000000. If the MPU works, the access should be denied, but it seems not. Do I misuse the functionality of MPU as it can only be used for special region such as CFG SCR or QMSS?

Allen

  • 0
    TI__Mastermind 18146 points

    Hi Allen,

    there's a very comprehensive application report including code to be found on our Embedded Processors Wiki:

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

    I think that addresses all of your questions in detail ... hope that helps.

    Kind regards,

    one and zero

  • 0 in reply to one and zero
    Genius 3770 points

    Hi one and zero,

    I think the page you point to help me to solve the problem.

    The Table 2 of that report shows how to protect the memory pages on the TMS320TCI6616, and MSMCRAM and DDR3 pages is Configurable via MPAX.

    Thanks.

    Allen