Hi Weidong,
thanks for your idea. I used "mount" to slove the problem. But I have another question based on “mount”. When I want to mount the sdcard, I find it is not possible, because my sdcard file system is NTFS or exFAT. It can only support “mount -t vfat” to mount FAT32 devices. It is not possible for me to make my sdcard as the system of “FAT32”. So is there any ways to make “mount -t ntfs” possible?
Also, I want to ask, is it possible to connect U-disk through TypeC connecter to read U-disk?
my system is android 8.1 on imx8 mek