It is not convenient that U-Boot can’t boot through NAND Flash.In this paper,the codes of U-Boot is modified to support that.This paper analyzes two steps of U-Boot and the method of supporting that the U-Boot boots from NAND Flash.Based on the memory characteristics and the physical structure of NAND Flash,this paper adds the codes of NAND Flash in order to carry the codes to SDRAM that stored in the NAND Flash,thus realizes U-Boot boots from NAND Flash.The modified U-Boot runs through NAND Flash straightl...