1on property:persist.mmc.max_read_speed=* 2 write /sys/block/mmcblk0/max_read_speed ${persist.mmc.max_read_speed} 3 4on property:persist.mmc.max_write_speed=* 5 write /sys/block/mmcblk0/max_write_speed ${persist.mmc.max_write_speed} 6 7on property:persist.mmc.cache_size=* 8 write /sys/block/mmcblk0/cache_size ${persist.mmc.cache_size} 9