Nowadays, embedded system is replacement products combined with specific object and highly advanced technology in the field of mobile communication. With the purpose to transplant U-boot onto target board cored with S3C2440, technical difficulties during transplantation are concerned. By analyzing working method of bootloader, U-boot was transplanted successfully, and this got good preparation for booting embedded Linux OS correctly. Compared to existing papers on bootloader transplantation, the importance of this paper is focused on solution to device compatibility problems, which hasn’t been mentioned up to now.