usb start
tftp ${kernel_addr_r} zImage
fatwrite mmc 0:1 ${fileaddr} zImage ${filesize}
tftp ${fdt_addr_r} pi_Domo.dtb
fatwrite mmc 0:1 ${fileaddr} pi_Domo.dtb ${filesize}
tftp ${ramdisk_addr_r} rootfs.cpio.uboot
fatwrite mmc 0:1 ${fileaddr} rootfs.cpio.uboot ${filesize}