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    • code protection on C6747

    code protection on C6747

    This question has suggested answer(s)
    Udo
    Posted by
    on Jun 18 2009 09:16 AM
    Prodigy30 points

    hi,

    is there a possibility to protect my code on the c6747?  i want to store the code in encrypted form in the eeprom and have a mini bootloader which decrypts the code after reading it into the processor.   therefore i need a unique processor identification number or similar.   in a presentation i heard something about "efuse"?

    any ideas?

    regards,

    udo

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    • TimHarron
      Posted by
      on Jun 18 2009 09:52 AM
      Suggested Answer
      Genius16720 points

      This is not something we offer at this time. You should check with your local sales team to discuss potential future opportunities regarding encrypted booting. This generally would require a custom boot spin, so the sales team should be able to fill you in on the details better than I. If unsure who your sales contact is you can find a listing of local offices here.

      -Tim

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    • Michael10327
      Posted by
      on Aug 08 2009 07:43 AM
      Prodigy180 points

      Hi,

      I've implemented a code protection some time ago on an 5509A DSP. I've used the SW-accessible die-number of the chip, which is, as TI stated, unique for every single chip! Actually I don't know if the C674x series have also an accessible die-number or similar. If you find out, please let me know.

      Regards,

      Michael

       

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    • Mariana
      Posted by
      on Aug 10 2009 10:38 AM
      Mastermind24340 points

       

      Hi Michael,

      Please see section 4.3 of the datasheet for Readable Device, Die, and Chip Revision ID.

      http://www.ti.com/lit/gpn/tms320c6747

      - Mariana

       

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    • Michael10327
      Posted by
      on Aug 10 2009 13:55 PM
      Prodigy180 points

      Hi Mariana,

      I see, thanks!

      Am I right to suppose that the Device Identification Register 0 - 3 is guaranteed to be unique for any chip?

      In the datasheet this is not explained and I didn't found any more information in the other related datasheets.

      Please let me know!

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    • Yan8622
      Posted by
      on Aug 10 2009 16:15 PM
      Expert1005 points

      How did you use the die number for the purpose of code protection? Don't you have to know all the die-numbers to be used in production beforehand?

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    • Michael10327
      Posted by
      on Aug 11 2009 07:18 AM
      Prodigy180 points

      Hi Yan,

      you're right, you need to know the die-number of every single chip before you can load then the die-number-encrypted FW to the program-flash.

      Anyway there are several ways to automate this in production. If it is worth to spend the extra cost depends of course on your project.

       

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