将内存中的程序下载到nand: a) nand erase 0x0 0x100000 擦出闪存0x0是地址, 0x100000是大小 b) nand write 0x20008000 0x0 0x10000 向闪存写数据第一个是内存地
U-boot中NFS启动:NFS启动
DFU_uboot搭建 :DFU 搭建
Boot from UART: http://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/Foundational_Components_U-Boot.html#booting-u-boot-from-the-console-uart