开发板 jz2440
下载uboot.bin
tftp 0x30000000 u-boot.bin nand erase bootloader nand write 30000000 bootloader
下载内核
tftp 0x30000000 uImage nand erase kernel nand write.jffs2 0x30000000 kernel
下载文件系统
tftpboot 30000000 fsroot.yaffs2 nand erase root nand write.yaffs 0x30000000 root $(filesize)