usb start
dhcp ${kernel_addr_r} zImage
fatwrite mmc 0:1 ${fileaddr} zImage ${filesize}
tftp ${fdt_addr_r} bcm2708-rpi-b.dtb
fatwrite mmc 0:1 ${fileaddr} bcm2708-rpi-b-plus.dtb ${filesize}
tftp ${ramdisk_addr_r} rootfs.cpio.uboot
fatwrite mmc 0:1 ${fileaddr} rootfs.cpio.uboot ${filesize}
setenv bootargs console=ttyAMA0,115200
bootz ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}