Most embedded devices provide a JTAG interface for debugging purposes. However, if left unprotected, this interface can become an important attack vector on the system.

The JTAG port on the STM32MP15 is managed as follows:

  • JTAG port is enabled on open devices

  • JTAG port is disabled on closed devices

To disable the JTAG port, set up secure boot and close the device as explained in Set up secure boot.