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Flash access fails after reset during programming

Guido Suedholt
Prodigy 130 points

Hi folks!

I am using Code Composer Studio V4.1.3.00038 with a XDS510LC USB emulator (Spectrum Digital) on a TMS320F2812 based board,
comparable to the eZdsp F2812 evaluation board.

Currently I have the problem that the flash memory of the TMS320F2812 is not accessible anymore (e.g. erasing, programming),
reading shows always 0x0000 on all flash memory locations. I get  error messages like:

C28xx: Flash Programmer: Error calculating checksum. Device is locked or not connected. Operation cancelled.
C28xx: Flash Programmer: Error erasing flash memory. Device is locked or not connected. Operation cancelled

 Internal and external RAM and Registers are accessible.
Locking / Passwords etc. were not used.

My assumption is, that the device gets some spurious / unintentional resets (XRS/ pin) during an earlier flash programming process (uploading object file).

Is it imaginable, that these resets (at admittedly unpropitious time) during the flash programming enable the locking / passwords of the flash memory?
Is it possible to revert theses changes (standard passwords)?
Or is the flash memory completely destroyed/defective now?

Currently I have the problem at to different boards; they worked fine and after getting resets while programming
they come up with these problems.

Thanks & Regards.
  Guido

  • 0
    TI__Guru**** 163275 points

    Guido,

    I am going to move the post into the C2000 forum as the group there is likely more familiar with what can cause this.

    Regards,

    John

     

  • 0
    TI__Guru* 93800 points

    Guido Suedholt said:

    My assumption is, that the device gets some spurious / unintentional resets (XRS/ pin) during an earlier flash programming process (uploading object file).

    Is it imaginable, that these resets (at admittedly unpropitious time) during the flash programming enable the locking / passwords of the flash memory?

    Guido,

    Yes, it is, unfortunately, possible.  If the interruption occurs at such a time to leave the password in some weird uknown state then the device will be locked. 

    Guido Suedholt said:
    Is it possible to revert theses changes (standard passwords)?

    This is a feature we have been looking at - but at this time it is not possible on the device you have.

    Guido Suedholt said:
    Or is the flash memory completely destroyed/defective now?

    If the password is unknown then it cannot be recovered unlocked.  Here are some trouble shooting tips to make sure it really is indeed locked:

    http://processors.wiki.ti.com/index.php/Code_Security_Module_FAQ_for_C2000#Common_Issues

    -Lori

  • 0 in reply to Lori Heustess
    Prodigy 130 points

    Hi Lori!

    Thanks for your quick reply, even if the news are not good.

    Regards.
      Guido