Chapter 8 EMMC

Using EMMC on a Linux system

The operating file of EMMC in the Linux system is/dev/mmcblk0. To use EMMC in the Linux system, you need to set the partition, format the partition, and mount the partition. For example

#If a partition already exists, unmount the partition first

sudo umount/dev/mmcblk0p1

#Delete a partition for /dev/mmcblk0 and create a new partition

echo "d

n

p

1

w

" | sudo fdisk/dev/mmcblk0

#Format the /dev/mmcblk0p1 partition into ext4 format

echo "y

" | sudo mkfs.ext4/dev/mmcblk0p1

#Mount /dev/mmcblk0p1 to /media/sd-mmcblk0p1

sudo mkdir/media/sd-mmcblk0p1 && sudo mount/dev/mmcblk0p1/media/sd-mmcblk0p1

Once mounted, you can manipulate the files in the mounted path, and these files will eventually be saved in the EMMC.

Test the EMMC using the system’s built-in script

Run sudo ~/test_apps/emmc_test.sh :