During September 2025, Greentime Hu contributed to the flipperdevices/u-boot repository by performing targeted codebase cleanup within the RISCV architecture code. He removed the unused DRAM_BASE macro from arch/riscv/encoding.h, eliminating dead code without affecting existing functionality. This disciplined refactoring improved maintainability and readability of the encoding paths, reducing technical debt and easing future onboarding for kernel and embedded systems development. Working primarily in C and leveraging his expertise in kernel development and Git-based workflows, Greentime focused on code hygiene and reviewability, ensuring that the boot sequence code remains robust and easier to modify for future enhancements or changes.