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TM4C129CNCPDT: Disable JTAG to prevent tamper

Part Number: TM4C129CNCPDT

Hi team

Customer want to accomplish the function as below, so maybe you could give some insight about that:

To prevent tamper, customer hope to disable the JTAG, just keep bootloader for downloading. Besides, after disabling JTAG, customer want to keep a way to re-enable JTAG for programming.

Now customer tried two ways for this purpose:

1. Change JTAG Pin to GPIO, but JLINK can still link and program, failed;

2. Leverage RM 4.3.4 Write-Protection of Flash to prevent tamper, but after this operation, they can't open the "write" function via software, so it also failed.

Do you have any suggestions? Thanks!