Haolun Song focused on improving the documentation quality of the SPI MSD Driver within the OpenSiFli/SiFli-SDK repository. He addressed a documentation bug by correcting comment inaccuracies related to SPI compatible modes and clarifying the maximum clock frequency, ensuring that the code comments accurately reflected the actual driver configuration. Working primarily in C and leveraging his expertise in driver development and embedded systems, Haolun’s targeted update reduced the risk of misconfiguration and improved onboarding for future developers. By maintaining existing functionality and enhancing clarity, his work contributed to the long-term maintainability and stability of the SDK without introducing new features.