03. How to install Yocto Image into eMMC

Getting Started

• Step 1: Copy the Yocto image to SD Card and boot it from SD Card on your target device

  ​ Please follow up the step i.MX6 /i.MX6R2 to copy image to SD Card.

• Step 2: After boot into OS, format the built-in eMMC storage

  1. Enter the command to identify the location of eMMC

     $ sudo fdisk -l
     

     Note:

     in our case, /dev/mmcblk0 is eMMC device and /dev/mmcblk1 is SD Card device.

  2. Enter the command to delete the existing partitions

     sudo fdisk /dev/mmcblk0
     

     p to list all partitions, then d and a number to delete all existing partitions, then w to write the changes.

  3. Create a new partition with the below command

     $ sudo fdisk /dev/mmcblk0 
     

     n to create new partition, then use all the defaults, then w to write the changes.

  4. Format the partition you created

     sudo mkfs.ext4 -L "emmc" /dev/mmcblk0p1
     

• Step 3: Copy the image from SD Card to the built-in eMMC and enter the command to start to copy

  $ sudo dd if=/dev/mmcblk1 of=/dev/mmcblk0 bs=1M count=3000
  $ sync
  

  Note:

  • /dev/mmcblk1: the SD Card device
  • /dev/mmcblk0 : the built-in eMMC device
  • bs=1M & count=3000 : the image size is about 3 GB (3000 x 1 MB). the size will be changed based on your image size.

• Step 4: Power off your target device and configure the dip switch or Jumper to eMMC booting.

  It supports several boot devices on LEC-BASE 2.0 and LEC BASE R1 carrier board .

  • For LEC-BASE 2.0 carrier board: selection of a specific boot device is defined by the switches (SW39), as follows:

    boot device	SW1	SW2	SW3	SW4
    eMMC	ON	OFF	OFF	OFF

  • For LEC BASE R1 carrier board: selection of a specific boot device is defined by the Jumpers (JP16, JP17, JP18, JP19 ), as follows:

    

Step 5: then, power on your target device and the booting message will be present from the UART console or HDMI display

Note:

For "LEC-iMX6" module, please boot to u-boot stage and configure the booting setting with the below command:

U-Boot> setenv boot_emmc LOAD=\'ext2load mmc 0:2\'\; BOOTARGS=\'mmcblk0p2 ro\'\; run boot
U-Boot> setenv bootcmd 'run boot_emmc'
U-Boot> saveenv
U-Boot> reset