Worked on enhancing the stability and portability of virtio drivers within the renesas/zephyr repository, focusing on cross-architecture compatibility for embedded systems. Addressed two critical bugs by refining 64-bit address handling in the virtio_mmio driver for 32-bit platforms and ensuring proper alignment of virtqueue receive callbacks for riscv32_virtual. These changes reduced build warnings and enabled reliable virtqueue functionality across diverse hardware targets. Leveraged expertise in C programming and driver development to implement targeted fixes that prevent undefined behavior and satisfy strict alignment requirements, contributing to more robust and maintainable driver code for embedded and cross-platform environments.