Developed full device support for the NicGiga S100-0800S-M 8-port 10G SFP+ managed switch in the DragonBluep/openwrt repository, enabling OpenWrt deployment on Realtek RTL9303 hardware. The work involved Linux kernel development in C, with a focus on device tree integration, memory and GPIO configuration, and I2C-based SFP presence detection. Addressed hardware wiring constraints by implementing software-based SFP detection via EEPROM polling and managed per-port LEDs through an I2C expander. Derived the device tree source from a similar platform to ensure maintainability and documented a vendor U-Boot and TFTP-based upgrade process for straightforward firmware installation.