Edwin Fernando enhanced the tezos/riscv-pvm repository by implementing explicit program counter update control for system calls, focusing on low-level systems and RISC-V architecture using Rust. He introduced a ProgramCounterUpdate enum and integrated it into the SystemCallResultExecution flow, allowing each system call handler to specify how the program counter should advance after a syscall. This architectural refactor improved the correctness and predictability of program flow, making syscall semantics safer and future enhancements easier to maintain. Although no bugs were fixed during this period, Edwin’s work demonstrated depth in system programming and contributed to the maintainability of the codebase.