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}