fastboot & others

fastboot devices #列出可用设备
fastboot boot ./boot.img
fastboot flash boot ./boot.img
fastboot flash system ./system.img
refer to:
  www.kingoapp.com/help/fastboot-mode.htm
  www.androidcentral.com/android-z-what-fastboot

Recovery, refer to:
  www.androidcentral.com/what-recovery-android-z

updateOTA文件存储在/cache/下
build/tools/releasetools/ota_from_target_files

charging control:
/sys/class/power_supply/{battery,usb}
/sys/module/msm_battery/parameters/usb_chg_enable  0/1