During a one-month contribution to the flipperdevices/u-boot repository, Greentime Hu focused on improving code maintainability within the RISCV architecture. He removed the unused DRAM_BASE macro from the arch/riscv/encoding.h header, targeting dead code without introducing functional changes. This cleanup, implemented in C and leveraging embedded systems and kernel development expertise, reduced technical debt and streamlined the codebase for future boot sequence modifications. By emphasizing disciplined code hygiene and clear commit traceability through Git, Greentime enhanced the readability and reviewability of the project. The work demonstrated a methodical approach to targeted refactoring, supporting long-term maintainability and onboarding efficiency.