on property:persist.mmc.max_read_speed=*
write /sys/block/mmcblk0/max_read_speed ${persist.mmc.max_read_speed}
on property:persist.mmc.max_write_speed=*
write /sys/block/mmcblk0/max_write_speed ${persist.mmc.max_write_speed}
on property:persist.mmc.cache_size=*
write /sys/block/mmcblk0/cache_size ${persist.mmc.cache_size}