Worked on the zephyrproject-rtos/hal_stm32 repository to address a critical issue in the build process for STM32WBA52XX devices. Focused on embedded systems and hardware abstraction, the developer identified and fixed a bug in the CMakeLists.txt file, ensuring the correct link-layer library was selected during builds. This CMake-based solution stabilized the build process across multiple toolchains, preventing mislinkage and runtime errors for downstream STM32 users. The fix was validated through CI and build checks, reducing the need for post-merge debugging. The work demonstrated careful root-cause analysis, precise patching, and clear documentation to support ongoing STM32 development workflows.