#!/bin/bash# 参考文章：#   1. Shell特殊变量：Shell $0, $#, $*, $@, $?, $$和命令行参数#       http://c.biancheng.net/cpp/view/2739.html# 
     
      Sending partition shell
     # 
     
       Partitioning...
     # 
     
       Partitioning...
     # 
     
      Formatting sd partition
     # partition size in MBBOOTLOAD_RESERVE=8          # bootload  8MB BOOT_ROM_SIZE=8             # 启动rom   8MBSYSTEM_ROM_SIZE=512         # 系统rom   512MBCACHE_SIZE=512              # 缓存      512MBRECOVERY_ROM_SIZE=8         # 恢复rom   8MBVENDER_SIZE=8               # 供货商    8MBMISC_SIZE=8                 # 杂项      8MBhelp() {# basename String [ Suffix ]# basename 命令读取 String 参数，删除以 /(斜杠) 结尾的前缀以及任何指定的 Suffix 参数，# 并将剩余的基本文件名称写至标准输出。bn=`basename $0`cat << EOFusage $bn  device_nodeoptions:  -h                displays this help message  -s                only get partition size  -np                 not partition.  -f                 flash android image.EOF}# check the if root?# 检查当前是否拥有root权限userid=`id -u`if [ $userid -ne "0" ]; then    echo "you're not root?"    exitfi# parse command line# 解析命令行参数moreoptions=1node="na"cal_only=0flash_images=0not_partition=0not_format_fs=0# $#: 传递给脚本或函数的参数个数。## $ sh mksdcard-android.sh /dev/mmcblk0# $1: /dev/mmcblk0## moreoptions: 1# node: /dev/mmcblk0while [ "$moreoptions" = 1 -a $# -gt 0 ]; do    case $1 in        -h) help; exit ;;        -s) cal_only=1 ;;        -f) flash_images=1 ;;        -np) not_partition=1 ;;        -nf) not_format_fs=1 ;;        *)  moreoptions=0; node=$1 ;;    esac    [ "$moreoptions" = 0 ] && [ $# -gt 1 ] && help && exit    [ "$moreoptions" = 1 ] && shiftdone# 如果node设备节点不存在，那么就退出程序if [ ! -e ${node} ]; then    help    exitfi# call sfdisk to create partition table# 调用sfdisk来创建分区表# get total card size# extend_size 增加了这个分量，同时data_size减小了这个分量，所以磁盘总量不变seprate=40         # -s [or --show-size]: 显示一个分区的大小，单位是KB。total_size=`sfdisk -s ${node}`total_size=`expr ${total_size} / 1024`      # 重新计算，将单位换算成MBboot_rom_sizeb=`expr ${BOOT_ROM_SIZE} + ${BOOTLOAD_RESERVE}`extend_size=`expr ${SYSTEM_ROM_SIZE} + ${CACHE_SIZE} + ${VENDER_SIZE} + ${MISC_SIZE} + ${seprate}`data_size=`expr ${total_size} - ${boot_rom_sizeb} - ${RECOVERY_ROM_SIZE} - ${extend_size} + ${seprate}`# create partitionsif [ "${cal_only}" -eq "1" ]; thencat << EOFBOOT   : ${boot_rom_sizeb}MBRECOVERY: ${RECOVERY_ROM_SIZE}MBSYSTEM : ${SYSTEM_ROM_SIZE}MBCACHE  : ${CACHE_SIZE}MBDATA   : ${data_size}MBMISC   : ${MISC_SIZE}MBEOFexitfi# destroy the partition table# 删除以前的分区表，从这里可以看出，分区表的大小貌似是1024字节dd if=/dev/zero of=${node} bs=1024 count=1sfdisk --force -uM ${node} << EOF,${boot_rom_sizeb},83,${RECOVERY_ROM_SIZE},83,${extend_size},5,${data_size},83,${SYSTEM_ROM_SIZE},83,${CACHE_SIZE},83,${VENDER_SIZE},83,${MISC_SIZE},83EOF# adjust the partition reserve for bootloader.# if you don't put the uboot on same device, you can remove the BOOTLOADER_ERSERVE# to have 8M space.# the minimal sylinder for some card is 4M, maybe some was 8M# just 8M for some big eMMC 's sylinder# -N# : 只改变分区的编号 #sfdisk --force -uM ${node} -N1 << EOF${BOOTLOAD_RESERVE},${BOOT_ROM_SIZE},83EOF# 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