在除錯RK3288的OV2718的驅動時，需要remount  /system目錄為rw以push檔案到/system/lib/hw目錄下，常規的是用adb登入上去後以root許可權執行mount -o remount,rw /system即可，然而在拿的新板子後這麼做失效了，於是百度找到方法如下：

adb shell  
 su  
 mount -o rw,remount -t ext4 /system

Edit: Found a better solution

From host machine(Linux or windows PC), execute the following commands.

>> adb root  
>> adb remount

remount will by default remount the /system partition with rw, if you have the permissions.

Note 1: To do su or adb root, your device must be rooted and have su executable on it. When you do an su, if it is executed properly, your terminal prompt will change from $ to #. Thanks..

Note 2: In recent mobiles, few of acer and samsung that i know, Security has been tightened, and even after rooting the phone, adb remount wouldn't work. As of i know, there is no solution available for it so far.