#!/bin/bash -e
  
  help() {
  
  bn=`basename $0`
  cat << EOF
  
  Version: 1.2
  Last change: Exit on error, and general cleanup
  
  Usage: $bn <option> device_node
  
  options:
    -h                displays this help message
    -s                only get partition size
    -np               not partition.
    -f soc_name       flash android image file with soc_name
    -F soc_name       determine the device_node's offset to flash bootloader and flash default android image file
                            SoC                       offset(KB)
                          default                          1
                          imx8dv                          16
                          imx8qm/imx8qxp/imx8mq           33
    -a                only flash image to slot_a
    -b                only flash image to slot_b
    -c card_size      optional setting: 7 / 14 / 28
                          If not set, use partition-table.img (default)
                          If set to  7, use partition-table-7GB.img  for  8GB SD card
                          If set to 14, use partition-table-14GB.img for 16GB SD card
                          If set to 28, use partition-table-28GB.img for 32GB SD card
                      Make sure the corresponding file exist for your platform.
    -m                flash m4 image
    -o force_offset   force set uboot offset
  EOF
  
  }
  
  # parse command line
  moreoptions=1
  node="na"
  soc_name=""
  force_offset=""
  cal_only=0
  card_size=0
  bootloader_offset=1
  m4_image_offset=5120
  vaild_gpt_size=17
  not_partition=0
  slot=""
  systemimage_file="system.img"
  systemimage_raw_file="system_raw.img"
  vendor_file="vendor.img"
  vendor_raw_file="vendor_raw.img"
  partition_file="partition-table.img"
  g_sizes=0
  append_soc_name=0
  support_dtbo=0
  flash_m4=0
  RED='\033[0;31m'
  STD='\033[0;0m'
  
  while [ "$moreoptions" = 1 -a $# -gt 0 ]; do
      case $1 in
          -h) help; exit ;;
          -s) cal_only=1 ;;
          -f) append_soc_name=1 ; soc_name=$2; shift;;
          -F) soc_name=$2; shift;;
          -c) card_size=$2; shift;;
          -np) not_partition=1 ;;
          -a) slot="_a" ;;
          -b) slot="_b" ;;
          -m) flash_m4=1 ;;
          -o) force_offset=$2; shift;;
          *)  moreoptions=0; node=$1 ;;
      esac
      [ "$moreoptions" = 0 ] && [ $# -gt 1 ] && help && exit
      [ "$moreoptions" = 1 ] && shift
  done
  
  # check required applications are installed
  command -v simg2img >/dev/null 2>&1 || { echo -e >&2 "${RED}Missing simg2img app. Please run: sudo apt-get install android-tools-fsutils${STD}" ; exit 1 ; }
  command -v hdparm >/dev/null 2>&1 || { echo -e >&2 "${RED}Missing hdparm app. Please make sure it is installed. Exiting.${STD}" ; exit 1 ; }
  command -v gdisk >/dev/null 2>&1 || { echo -e >&2 "${RED}Missing gdisk app. Please make sure it is installed. Exiting.${STD}" ; exit 1 ; }
  
  if [ ${card_size} -ne 0 ] && [ ${card_size} -ne 7 ] && [ ${card_size} -ne 14 ] && [ ${card_size} -ne 28 ]; then
      help; exit 1;
  fi
  
  if [ "${soc_name}" = "imx8dv" ]; then
      bootloader_offset=16
  fi
  
  if [ "${soc_name}" = "imx8qxp" -o "${soc_name}" = "imx8qm" ]; then
      bootloader_offset=32
  fi
  
  if [ "${soc_name}" = "imx8mq" -o "${soc_name}" = "imx8mm" -o "${soc_name}" = "smarcimx8mq" -o "${soc_name}" = "smarcimx8mq-hdmi" -o "${soc_name}" = "smarcimx8mq-dp" -o "${soc_name}" = "smarcimx8mq-lcdif-lvds" -o "${soc_name}" = "smarcimx8mq-dcss-lvds" -o "${soc_name}" = "smarcimx8mq-dual-display" -o "${soc_name}" = "smarcimx8mq-edp" ]; then
      bootloader_offset=33
  fi
  
  if [ "${force_offset}" != "" ]; then
      bootloader_offset=${force_offset}
  fi
  
  if [ ! -e ${node} ]; then
      help
      exit 1
  fi
  
  echo "${soc_name} bootloader offset is: ${bootloader_offset}"
  
  if [ "${soc_name}" != "" ] && [ "${append_soc_name}" -eq 1 ]; then
      soc_name="-${soc_name}"
  else
      soc_name=""
  fi
  
  # dump partitions
  if [ "${cal_only}" -eq "1" ]; then
      gdisk -l ${node} 2>/dev/null | grep -A 20 "Number  "
      exit 0
  fi
  
  function get_partition_size
  {
      start_sector=`gdisk -l ${node} | grep -w $1 | awk '{print $2}'`
      end_sector=`gdisk -l ${node} | grep -w $1 | awk '{print $3}'`
      # 1 sector = 512 bytes. This will change unit from sector to MBytes.
      let "g_sizes=($end_sector - $start_sector + 1) / 2048"
  }
  
  function format_partition
  {
      num=`gdisk -l ${node} | grep -w $1 | awk '{print $1}'`
      if [ ${num} -gt 0 ] 2>/dev/null; then
          echo "format_partition: $1:${node}${num} ext4"
          mkfs.ext4 -F ${node}${num} -L$1
      fi
  }
  
  function erase_partition
  {
      num=`gdisk -l ${node} | grep -w $1 | awk '{print $1}'`
      if [ ${num} -gt 0 ] 2>/dev/null; then
          get_partition_size $1
          echo "erase_partition: $1 : ${node}${num} ${g_sizes}M"
          dd if=/dev/zero of=${node}${num} bs=1048576 conv=fsync count=$g_sizes
      fi
  }
  
  function flash_partition
  {
      for num in `gdisk -l ${node} | grep -E -w "$1|$1_a|$1_b" | awk '{print $1}'`
      do
          if [ $? -eq 0 ]; then
              if [ $(echo ${1} | grep "system") != "" ] 2>/dev/null; then
                  img_name=${systemimage_raw_file}
              elif [ $(echo ${1} | grep "vendor") != "" ] 2>/dev/null; then
                  img_name=${vendor_raw_file}
              elif [ ${support_dtbo} -eq 1 ] && [ $(echo ${1} | grep "boot") != "" ] 2>/dev/null; then
                  img_name="boot.img"
              else
                  img_name="${1%_*}${soc_name}.img"
              fi
              echo "flash_partition: ${img_name} ---> ${node}${num}"
              if [ ! -f "${img_name}" ]; then
                  echo -e >&2 "${RED}File ${img_name} not found. Please check. Exiting${STD}"
                  return 1
              fi
              dd if=${img_name} of=${node}${num} bs=10M conv=fsync
          fi
      done
  }
  
  function format_android
  {
      echo "formating android images"
      format_partition userdata
      format_partition cache
      erase_partition presistdata
      erase_partition fbmisc
      erase_partition misc
  }
  
  function make_partition
  {
      if [ ${card_size} -gt 0 ]; then
          partition_file="partition-table-${card_size}GB.img"
      fi
      if [ ! -f "${partition_file}" ]; then
          echo -e >&2 "${RED}File ${partition_file} not found. Please check. Exiting${STD}"
          return 1
      fi
      echo "make gpt partition for android: ${partition_file}"
      dd if=${partition_file} of=${node} bs=1k count=${vaild_gpt_size} conv=fsync
  }
  
  function flash_android
  {
      boot_partition="boot"${slot}
      recovery_partition="recovery"${slot}
      system_partition="system"${slot}
      vendor_partition="vendor"${slot}
      vbmeta_partition="vbmeta"${slot}
      dtbo_partition="dtbo"${slot}
      gdisk -l ${node} 2>/dev/null | grep -q "dtbo" && support_dtbo=1
  
      bootloader_file="u-boot-imx8mq-smarcimx8mq_2g.imx"
      if [ "${support_dtbo}" -eq "1" ] ; then
          flash_partition ${dtbo_partition} || exit 1
      fi
      flash_partition ${boot_partition}  || exit 1
      flash_partition ${recovery_partition}  || exit 1
      simg2img ${systemimage_file} ${systemimage_raw_file}
      flash_partition ${system_partition} || exit 1
      rm ${systemimage_raw_file}
      simg2img ${vendor_file} ${vendor_raw_file}
      flash_partition ${vendor_partition} || exit 1
      rm ${vendor_raw_file}
      flash_partition ${vbmeta_partition} || exit 1
      echo "erase_partition: uboot : ${node}"
      echo "flash_partition: ${bootloader_file} ---> ${node}"
      first_partition_offset=`gdisk -l ${node} | grep ' 1 ' | awk '{print $2}'`
      # the unit of first_partition_offset is sector size which is 512 Byte.
      count_bootloader=`expr ${first_partition_offset} / 2 - ${bootloader_offset}`
      echo "the bootloader partition size: ${count_bootloader}"
      dd if=/dev/zero of=${node} bs=1k seek=${bootloader_offset} conv=fsync count=${count_bootloader}
      dd if=${bootloader_file} of=${node} bs=1k seek=${bootloader_offset} conv=fsync
      if [ "${flash_m4}" -eq "1" ] ; then
          m4_image=${soc_name#*-}"_m4_demo.img"
          echo "flash_partition: ${m4_image} ---> ${node}"
          dd if=${m4_image} of=${node} bs=1k seek=${m4_image_offset} conv=fsync
      fi
  }
  
  if [ "${not_partition}" -eq "1" ] ; then
      flash_android || exit 1
      exit 0
  fi
  
  make_partition || exit 1
  
  sleep 3
  for i in `cat /proc/mounts | grep "${node}" | awk '{print $2}'`; do umount $i; done
  hdparm -z ${node}
  
  # backup the GPT table to last LBA for sd card.
  echo -e 'r
  e
  Y
  w
  Y
  Y' |  gdisk ${node}
  
  format_android
  flash_android || exit 1
  
  echo
  echo ">>>>>>>>>>>>>> Flashing successfully completed <<<<<<<<<<<<<<"
  
  exit 0
  
  # For MFGTool Notes:
  # MFGTool use mksdcard-android.tar store this script
  # if you want change it.
  # do following:
  #   tar xf mksdcard-android.sh.tar
  #   vi mksdcard-android.sh 
  #   [ edit want you want to change ]
  #   rm mksdcard-android.sh.tar; tar cf mksdcard-android.sh.tar mksdcard-android.sh