I inserted an SD card on the development board, modified the device/fsl/imx8m/evk_8mm/fstab.freescale file,
Add the following content in the last line:
/devices/platform/30b50000.mmc/mmc_host/mmc1/* auto vfat defaults voldmanaged=sdcard:auto
After the image is compiled and burned, it can be accessed under the admin user, but my own app cannot access the SD card. How should I modify the file?