Unsupported target

The connected MCU is not recognized by the probe driver.

CORTEX_M_UNSUPPORTED_TARGET

Symptoms

  • The target connects but is identified only as generic Cortex-M.
  • Flashing is unavailable or fails with a missing memory map.
  • A newly released MCU variant is not in the target list.

Likely causes

  • pyOCD identifies targets by a database of parts (built-in + CMSIS packs); an unknown part falls back to generic cortex_m — debuggable, but with no flash algorithm or memory map.
  • The exact target was never selected, so auto-detection stopped at the generic fallback.
  • MCUHex supports SWD-based ARM Cortex-M targets only — JTAG-only parts (e.g. TI C2000) are outside the supported set.

How to fix it

  1. Select the exact MCU

    Pick your part number in the Target selector in the MCUHex footer (e.g. STM32G474RETx). This loads the correct memory map and flash algorithm.

  2. Confirm the family is supported

    MCUHex targets SWD-capable ARM Cortex-M devices (ST-Link, J-Link, DAPLink probes). If your part is JTAG-only or non-ARM, it will not work regardless of settings.

  3. Very new parts

    If the part is newer than the target database, the vendor’s CMSIS pack may not be integrated yet — tell us which part you need via the feedback form.

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