解压boot.img发现init.ssd_nomuser.rc内容如下
# MTK project .rc configure
on post-fs-data
#
# SHARED_SDCARD related directory & configuration (begin)
#
# we will remap this as /mnt/sdcard with the sdcard fuse tool
mkdir /data/media 0770 media_rw media_rw
chown media_rw media_rw /data/media
#
# SHARED_SDCARD related directory & configuration (end)
#
#
# NO SHARED_SDCARD feature option
#
on init
mkdir /storage/sdcard0 0000 system system
mkdir /storage/sdcard1 0000 system system
export EXTERNAL_STORAGE /storage/sdcard0
export SECONDARY_STORAGE /storage/sdcard1
# for backwards compatibility
symlink /storage/sdcard0 /sdcard
symlink /storage/sdcard0 /mnt/sdcard
symlink /storage/sdcard1 /mnt/sdcard2
on boot
#
# SHARED_SDCARD related services (Begin)
#
# create virtual SD card at /mnt/sdcard, based on the /data/media directory
# daemon will drop to user/group system/media_rw after initializing
# underlying files in /data/media will be created with user and group media_rw (1023)
service sdcard /system/bin/sdcard /data/media /storage/sdcard0 1023 1023
class late_start
#
# SHARED_SDCARD related services (End)
#