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TM4C123GH6PZ: How to recover the locked device

U-SK
Genius 5840 points
Part Number: TM4C123GH6PZ
Other Parts Discussed in Thread: UNIFLASH

Hello.

After performing the "Permanently Disabling Debug" once in page 540 in datasheet, can we unlock the device using the way described 4.3.4.3 in datasheet?

If yes, are there any way to do unlock described 4.3.4.3 in datasheet by XDS debugger?

Or, are there any tools which can execute sequence described 4.3.4.3 in datasheet?

Regards,

U-SK

  • 0
    TI__Guru**** 184456 points

    Hi,

      If you have ICDI debug probe then you can use the LM flash programmer to unlock the device. 

    If you have XDS100, XDS200 or Jlink then please use Uniflash to unlock the device. Uniflash can be used if you use ICDI too.

  • 0 in reply to Charles Tsai
    Genius 5840 points

    Hi Charles,

    Thank you for your reply.

    These solutions you mentioned are perform chapter 4.3.4.3 in datasheet, right?

    And let me ask one more question.

    If execute only protection described chapter 8.2.3.3 is performed at once, are there any way to unlock the device?

    Regards,

    U-SK

  • 0 in reply to U-SK
    TI__Guru**** 184456 points

    Hi,

    U-SK said:
    These solutions you mentioned are perform chapter 4.3.4.3 in datasheet, right?

    Yes, your understanding is correct.

    U-SK said:
    If execute only protection described chapter 8.2.3.3 is performed at once, are there any way to unlock the device?

    Once it is in execute-only protection, you will not be able view the content of the flash memory. It is different than permanently disabling JTAG access. Although the flash memory is not readable, the debugger can still connect to the device. You don't need to 'unlock' the device in execute-only mode. You simply just erase the flash or load a new program.

  • 0 in reply to Charles Tsai
    Genius 5840 points

    Hi Charles,

    Thank you for your reply.

    >You simply just erase the flash or load a new program.

    But it seems that execution only mode can not elase or rewrite according to below description in datasheet.

    Could you clarify if we can erase and write flash or unlock?

    Regards,

    U-SK

     

  • 0 in reply to U-SK
    TI__Guru**** 184456 points

    Hi U-SK,

      I'm sorry to give you the wrong answer. You are right that in execute-only mode you cannot erase. You will need to 'unlock' the device using either the LM flash programmer or Uniflash. 

  • 0 in reply to Charles Tsai
    Genius 5840 points

    Hi Charles,

    Thank you for your reply.

    In case Execution only mode, Uniflash and LM Flasher can unlock with same way as the solution in the below post? 

    https://e2e.ti.com/support/microcontrollers/other/f/908/p/922318/3407328#3407328

    Regards,

    U-SK

  • 0 in reply to U-SK
    TI__Guru**** 184456 points

    Hi U-SK,

      That is correct. The unlock is a mass-erase operation. If you have data in the EEprom then it will get erased too. Same for the non-volatile registers such as BOOTCFG, USER_REG1 and USER_REG2. 

  • 0 in reply to Charles Tsai
    Genius 5840 points

    Hi Charles,

    Thank you for your reply.

    I understand!

    Regards,

    U-SK