Jtag Lock and Unlock feature for s32k312

[abdul_rahiman_csg]

How to enable and disable JTAG Lock/Unlock using password authentication for S32K312 MC in WinIDEA or SEGGER J-Flash?

[VaneB]

Hi @abdul_rahiman_csg 

The process to protect JTAG with a password depends on whether the HSE firmware is used or not:

With HSE FW:

1. Set up the ADKP (Application Debug Key/Password).
2. Ensure that authentication method is configured as password mode or challenge-response mode.
3. Advance the lifecycle stage.

For more information, refer to section 2.6.1.4 (Debug) of the HSE_B Firmware Reference Manual, Rev. 2.4. Additionally, we provide examples in the HSE DemoApp (located in S32K3 Standard Software > Automotive SW - S32K3 - HSE Firmware) and in the S32K3 MCUs for General Purpose HSE Demo Examples.

Without HSE FW:

1. Program the CUST_DB_PSWD_A field in UTEST memory.
2. Advance the lifecycle stage.

For further details, refer to [S32K3] Restrict the debug access with a password when HSE is not used.

For instructions on how to unlock the device, please refer to the following links from Segger and iSYSTEM:

How to unlock secure debug on NXP S32G2/3xx, S32R45x, and S32K3

SEGGER- NXP S32K3xx

BR, VaneB