Chengming Lin enhanced the flipperdevices/u-boot repository by developing two features focused on SPI NAND reliability and hardware compatibility. He implemented Plane Select Bit Support and Read Retry Support, updating the MTD spinand layer and core read path to address data integrity and device interoperability challenges. Using C and leveraging expertise in device drivers and embedded systems, Chengming enabled robust firmware loads by supporting plane addressing and ECC failure recovery. His work included targeted validation across hardware paths, ensuring the new features improved SPI NAND operations without introducing regressions. The depth of these changes reflects strong kernel and NAND flash development skills.