SPMA083 January   2022 TM4C129CNCPDT , TM4C129CNCPDT , TM4C129CNCZAD , TM4C129CNCZAD , TM4C129DNCPDT , TM4C129DNCPDT , TM4C129DNCZAD , TM4C129DNCZAD , TM4C129EKCPDT , TM4C129EKCPDT , TM4C129ENCPDT , TM4C129ENCPDT , TM4C129ENCZAD , TM4C129ENCZAD , TM4C129LNCZAD , TM4C129LNCZAD , TM4C129XKCZAD , TM4C129XKCZAD , TM4C129XNCZAD , TM4C129XNCZAD

 

  1.   Trademarks
  2. 1Implementation
    1. 1.1 Flash Boot Loader Project
      1. 1.1.1 Changes to the Example Project boot_serial
        1. 1.1.1.1 Changes to bl_config.h
        2. 1.1.1.2 New Functions Added
          1. 1.1.1.2.1 MyCheckUpdateFunc
          2. 1.1.1.2.2 MyReinitFunc
          3. 1.1.1.2.3 MyEndFunc
          4. 1.1.1.2.4 MyDecryptionFunc
    2. 1.2 Image Creation Project
    3. 1.3 Key Image Project
    4. 1.4 EK-TM4C129EXL Example Application Project
    5. 1.5 DK-TM4C129X Example Application Project
    6. 1.6 RAM-Based EEPROM Erase Project
  3. 2Example Walk Through
    1. 2.1 Build Environment
    2. 2.2 Importing the Examples into Code Composer Studio
    3. 2.3 Setting Keys and Variables
      1. 2.3.1 Keys
      2. 2.3.2 Initialization Vector
      3. 2.3.3 Application Start Address and Flash Size
        1. 2.3.3.1 APP_BASE
        2. 2.3.3.2 APP_END
        3. 2.3.3.3 RAM_BASE
    4. 2.4 Running the shared_key_image_encrypt Tool
    5. 2.5 Running the Shared Key Serial Boot Loader
      1. 2.5.1 Programming the Boot Loader
        1. 2.5.1.1 Erasing Existing Code and Keys
          1. 2.5.1.1.1 Erasing Flash and EEPROM With Code Composer Studio
          2. 2.5.1.1.2 Erasing Flash and EEPROM by Using the Unlock Procedure
        2. 2.5.1.2 Using the ROM Boot Loader to Program the Shared Key Boot Loader
      2. 2.5.2 Using the Shared Key Boot Loader to Program the Application Code
    6. 2.6 Returning to the Boot Loader
  4. 3Summary
2.5.1.1.2 Erasing Flash and EEPROM by Using the Unlock Procedure

The unlock procedure causes all flash, EEPROM, and device settings to be restored to factory conditions. This causes the MAC address stored in the user registers of the LaunchPad to be erased. It is recommended to record the MAC address before unlocking the part so that it can be restored afterwords.

The unlock procedure using LM Flash Programmer is described in the Executing Unlock Sequence section in Using TM4C12x Devices Over JTAG Interface.