OpenOCD Fails to Identify STM32U3 Device

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#40 opened on Jul 16, 2025 5 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 48/100

Issue type: Feature
Clarity: Mostly clear
Activity status: Quiet
Tech stack: c
Domain: devtools, embedded-iot

Research direction

Start by reproducing the connection failure with the NUCLEO STM32U385RG-Q and the STM32CubeMX-generated .cfg file. Trace the STM32 family auto_probe path reported in the error, focusing on why the STM32U3 device is not identified. Done means OpenOCD recognizes the STM32U3 target and establishes the debug connection without the reported auto_probe failure.

Written by the indexing model from the issue text.

Description

Hi team,

I'm currently trying to debug an STM32U3 series microcontroller using OpenOCD. Since OpenOCD does not yet include an official configuration file for the STM32U3 family, I used the config file generated by STM32CubeMX.

However, when I attempt to connect to the target, I receive the following errors:

CPU in Non-Secure state [stm32u3.cpu] halted due to debug-request, current mode: Thread xPSR: 0x69000000 pc: 0x0800066c msp: 0x2002fff8 Error: Failed to read memory at 0x40015800 Warn : Cannot identify target as an STM32C0/G0/G4/L4/L4+/L5/U0/U5/WB/WL family device. Error: auto_probe failed

Details:
MCU: NUCLEO STM32U385RG-Q
Config: Using the .cfg file auto-generated by STM32CubeMX

It seems the STM32U3 series is not recognised. Is there any ongoing work or guidance on adding support for the STM32U3 series to OpenOCD?

Thanks in advance!

Dominant language: C
Stars: 202
Forks: 57
PR merge metrics: No merged PRs in 30d

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