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mert_ozgur
Visitor II
August 13, 2025
Question

STM32MP257 programming via JTAG

  • August 13, 2025
  • 1 reply
  • 675 views

Hello, we are currently designing a STM32MP257 based custom board. For reference, we are looking into STM32MP257F-EV1 and STM32MP257-DK evaluation kit schematics. In both schematics, there is an STM32 MCU which connects to the JTAG ports of the STM32MP257. Is this MCU used as an STLINK to provide JTAG to USB2.0 conversion? If so, if we are to implement the same structure on our board, is there a way to access the STLINK firmware and embed it into our own MCU? Furthermore, is there an external STLINK adapter dedicated for STM32MP25 series MPUs to access JTAG over USB?

My second question is that can we program the MPU using the JTAG pins? Both in reference manual and datasheet of the MPU, there doesn't seem to be a boot mode setting for JTAG.

 

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    Olivier GALLIEN
    Technical Moderator
    September 25, 2025

    Hi @mert_ozgur 

     

    STLINK-V3MODS | Tool - STMicroelectronics looks to be what you need to integrate STLINK in a custom board

    Else external probe is also available. 

     

    MP257 can't be programmed by JTAG but only through DFU USB/Serial.  JTAG/STLink can be used anyway to debug with STM32CubeIDE

     

    Have a look to wiki to get useful guidance stm32mpu 

     

    Olivier 

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