letux: add a script to boot a kernel over usb

#!/bin/bash

set -e

if [ $# -lt 4 ] ; then

  echo Usage $0 'uImage ramdisk|- fdt|-  [args...]'

fi

KERNEL="$1"

INITRD="$2"

FDT="$3"

shift

shift

shift

dfu-util -a kernel -D "$KERNEL"

[ "$INITRD" != "-" ] && dfu-util -a rd -D "$INITRD"

[ "$FDT" != "-" ] && dfu-util -a fdt -D "$FDT"

SCRIPT_CMD="$(tempfile)"

(

echo setenv bootargs "$*"

echo -n 'bootm ${loadaddr}'

if [ "$INITRD" != "-" ] ; then

  echo -n ' ${loadaddrinitrd}'

else

  echo -n ' -'

fi

if [ "$FDT" != "-" ] ; then

  echo  ' ${loadaddrfdt}'

else

  echo ' -'

fi

) >> "$SCRIPT_CMD"

SCRIPT_SCR="$(tempfile)"

mkimage -A arm -O linux -T script -C none -a 0 -e 0 -n 'Boot Script' -d "$SCRIPT_CMD" "$SCRIPT_SCR"

dfu-util -a script -D "$SCRIPT_SCR"

rm "$SCRIPT_SCR" "$SCRIPT_CMD"

sleep 0.5

dfu-util -a script -e