generate_sunxi_bootloader

#!/bin/sh

# Usage function
function usage() {
  cat >&2 <<EOF
${SH_FILE} is used to generate/burn official U-Boot firmware for Allwinner SoC

Usage: ${SH_FILE} [-c] [-h] [-s]

Where:
  -c    copy the binary blob files in the current directory
  -h    this help page
  -s    "burn" the generated U-Boot file on a sdcard
EOF
  exit 0
}

# Error function
function error() {
  echo -e "$@" >&2
  exit 1
}

# Copy/Check function
function copy() {
  typeset -r FILE=$1
  typeset -r DEST=$2

  cp ${FILE} ${DEST} >/dev/null 2>&1 \
    || error "Error while copying file ${FILE} to ${DEST}!"
}

# Variable(s)
typeset -r SH_FILE=${0##*/}
typeset -r U_BOOT_DIR=/dev/shm/u-boot-tmp
typeset -i COPY_FW=0
typeset -i BURN=0
typeset -l BURN_FILE
typeset DEV

# Get options
while getopts "csh" ARG; do
  case ${ARG} in
    c) COPY_FW=1
       ;;
    s) BURN=1
       BURN_FILE=u-boot-sunxi-with-spl.bin
       DEV=${MMC_DEV:=/dev/mmcblk0}
       ;;
    h|*) usage
       ;;
  esac
done
shift $((OPTIND-1))

# Copy U-Boot files in the current directory
if (( COPY_FW )); then
  for FILE in ${U_BOOT_DIR}/spl/*spl* ${U_BOOT_DIR}/u-boot*; do
    echo "- Copy firmware file ${FILE##*/}..."
    copy ${FILE} ${PWD}
  done
fi

# Write U-Boot to sd-card
if (( BURN )); then
  echo "- Burning ${BURN_FILE}..."
  dd if=${U_BOOT_DIR}/${BURN_FILE} of=${DEV} conv=fsync,notrunc bs=8k seek=1
  sync ${DEV}
fi

# Clean exit
exit 0