how to to flash stm32mp257-DK in baremetal with cube ide ?

[maths]

STM32CubeIDE

Version: 2.1.1

Build: 28236_20260312_0043 (UTC)

How can I make sense of this ?

TMicroelectronics ST-LINK GDB server. Version 7.13.0
Copyright (c) 2026, STMicroelectronics. All rights reserved.

Starting server with the following options:
        Persistent Mode            : Disabled
        Logging Level              : 1
        Listen Port Number         : 61234
        Status Refresh Delay       : 15s
        Verbose Mode               : Disabled
        SWD Debug                  : Enabled

Waiting for debugger connection...
Debugger connected
Waiting for debugger connection...
Debugger connected
Waiting for debugger connection...
      -------------------------------------------------------------------
                        STM32CubeProgrammer v2.22.0                  
      -------------------------------------------------------------------



Log output file:   /tmp/STM32CubeProgrammer_Xj0e11.log
Error: Unable to connect to the target device, Access port is not valid.
Encountered Error when opening /home/soham/st/stm32cubeide_2.1.1/plugins/com.st.stm32cube.ide.mcu.externaltools.cubeprogrammer.linux64_2.2.400.202601091506/tools/bin/STM32_Programmer_CLI
Shutting down...
Exit.

I have added the "monitor flash mass_erase" to starter as explained in this thread, 

I have set the boot switches into dev mode 0011:

[Duc]

Hi @maths ,

Have you followed this tutorial: Modify, rebuild and reload the firmware - stm32mpu ?

[maths]

yes, But

"STM32CubeIDE requires a connection to Linux® running on an STM32MP2 device though a serial connection."

WHy is linux needed to write into flash ? isn't there an easier way of writing into flash ?

 It can't reach the board : " [Debugger]: The inet address '192.168.7.1' is not reachable."

The board does not have a default IP configured for its ethernet interface, I configured it but couldn't connect either.

I tried configuring the IP tables, I still can't ping the board.

[PatrickF · Accepted solution]

HI @maths 

bare-metal on cortex-A35 for STM32MP25 is not supported. It is not planned, but maybe it will come this year bare-metal support for Cortex-A35 on STM32MP21.

In any case, unlike STM32 MCUs, on STM32MP platforms, it is NOT possible to Flash (external Flash) using JTAG/SWD.

For Cortex-M33 SW, STM32MP products external Flash could be up with SSH (RJ45 or ETHoverUSB) which need to have Linux running on the platform or using USB with CubeProgrammer.

https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP2_boards/STM32MP257x-DK/Develop_on_Arm_Cortex-M33/Modify,_rebuild_and_reload_the_firmware

Otherwise, OpenSTLinux image build with Yocto is flashed with CubeProgrammer using USB (no involvement of CubeIDE).

https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP2_boards/STM32MP257x-DK/Let%27s_start/Populate_the_target_and_boot_the_image 

Regards.