STM32MP257F-EV1 – Issue in connecting ST-Link with STM32CubeProgrammer

[Kaviya_M]

Hi ST Team,

I am working with STM32MP257F-EV1 board and facing an issue while trying to connect the ST-Link interface using STM32CubeProgrammer.

Connection setup:
An external ST-LINK/V2 programmer is connected to the CN22 (ST-LINK header) on the STM32MP257F-EV1 board.

Behaviour:
1) Tried connecting with both SWD and JTAG modes, but the connection fails in both the cases.
2) The board is detected only when connecting USB to connector CN15(USB_DRD) in DFU Mode.

For your reference ,I have attached the STM32CubeProgrammer configuration screenshots and connection logs.

Additionally, while reviewing the ST Community forum, I found the following discussion related to this issue.
link: https://community.st.com/t5/stm32-mpus-software-development/debug-authentication-on-the-stm32mp2257f-ev1-for-st-link/td-p/708255

Could you please confirm whether this behavior is expected for the STM32MP257F-EV1 and any configuration or steps to enable and validate CN22 (ST-LINK header) on STM32MP257F-EV1 board ?

Thanks and Regards,
Kaviya M

[PatrickF · Accepted solution]

Hi @Kaviya_M 

Unlike other STM32 MCUs, the STM32MPx MPUs cannot be flashed with JTAG/SWD.

Only USB (and to a certain extend, UART) should be used with CubeProgrammer.

https://wiki.st.com/stm32mpu/wiki/STM32CubeProgrammer

JTAG/SWD (and so, STLINK) is only used for debug purposes.

https://wiki.st.com/stm32mpu/wiki/STM32_MPU_Platform_trace_and_debug_environment_overview

Regards.