The ConnectCore 93 is shipped without a default operating system loaded. Only U-Boot is flashed in the device. This step demonstrates how to install Digi Embedded Yocto in your ConnectCore 93.

1. Establish a serial connection with your device

Open a serial connection with the device. You can use any serial terminal program such as Tera Term, Minicom, CoolTerm, or HyperTerminal.

PuTTY terminal program is not recommended due to an incompatibility with the USB/serial driver.

Open a serial connection with the following settings:

Parameter Value

Port

Serial port where the device is connected

Baud rate

115200

Data bits

8

Parity

None

Stop bits

1

Flow control

None

2. Download the firmware

To access firmware images, please fill out the following form to provide some information so we can better understand your project needs.

If the form doesn’t load after a few seconds, you may need to refresh the page. Contact Digi Support Services if you are not able to access the firmware images.

3. Program the firmware

There are multiple methods of programming the firmware to the target:

Program the firmware using UUU

  1. Decompress the zip file in a directory of your choice.

  2. Download the latest Universal Update Utility (UUU), a software tool from NXP.

    UUU version should be 1.5.11 or higher.
  3. Place the uuu executable in a directory in your PATH, such as /usr/bin.

  4. Install udev rules to allow any user to run uuu to access the USB port:

    $ sudo sh -c "uuu -udev >> /etc/udev/rules.d/70-uuu.rules"
    $ sudo udevadm control --reload
  5. Connect a USB type-C cable to your development PC and the other end to the target USB type-C connector.

  6. Reset the device by pressing the reset button on the board and immediately press any key in the serial terminal to stop the auto-boot process. The U-Boot bootloader prompt displays:

    U-Boot SPL dub-2023.04-r3.2 (Jan 30 2024 - 10:57:23 +0000)
    SOC: 0xa1009300
    LC: 0x2040010
    PMIC: Over Drive Voltage Mode
    M33 prepare ok
    Normal Boot
    Trying to boot from BOOTROM
    Boot Stage: Primary boot
    image offset 0x0, pagesize 0x200, ivt offset 0x0
    Load image from 0x4f400 by ROM_API
    NOTICE:  BL31: v2.8(release):lf-6.1.55-2.2.0-0-g08e9d4eef226-dirty
    NOTICE:  BL31: Built : 16:47:44, Jan 30 2024
    
    
    U-Boot dub-2023.04-r3.2 (Jan 30 2024 - 10:57:23 +0000)
    
    CPU:   i.MX93(52) rev1.1 1700 MHz (running at 1692 MHz)
    CPU:   Industrial temperature grade (-40C to 105C) at 42C
    Reset cause: POR (0x1)
    DRAM:  992 MiB
    Core:  202 devices, 29 uclasses, devicetree: separate
    MMC:   FSL_SDHC: 0, FSL_SDHC: 1
    In:    serial
    Out:   serial
    Err:   serial
    Model: Digi ConnectCore 93 Development Kit
    ConnectCore 93 SOM variant 0x01: 992 MiB LPDDR4, Wi-Fi, Bluetooth
    Boot:  MMC0
    
    BuildInfo:
      - ELE firmware version 0.1.0-44880904
    
    flash target is MMC:0
    Net:   eth0: ethernet@428a0000 [PRIME]
    Fastboot: Normal
    Normal Boot
    Hit any key to stop autoboot:  0
    => 
    Information in the console log may vary.
  7. On the target, in U-Boot, execute the following command:

    => fastboot 1
  8. On your development PC, change to the directory where you extracted the ZIP file:

    $ cd <zip-folder>
  9. Run the install_linux_fw_uuu.sh script with -h parameter to check the syntax:

    $ ./install_linux_fw_uuu.sh -h
    ############################################################
    #           Linux firmware install through USB OTG         #
    ############################################################
    Usage: ./install_linux_fw_uuu.sh [options]
    
      Options:
       -b                     Activate bootcount mechanism (3 boot attempts).
       -d                     Install firmware on dualboot partitions (system A and system B).
                              (Implies -b).
       -h                     Show this help.
       -i <dey-image-name>    Image name that prefixes the image filenames, such as 'dey-image-qt',
                              'dey-image-webkit', 'core-image-base'...
                              Defaults to 'dey-image-qt' if not provided.
       -k <dek-filename>      Update includes dek file.
                              (implies -t)."
       -n                     No wait. Skips 10 seconds delay to stop script.
       -t                     Install TrustFence artifacts.
       -u <u-boot-filename>   U-Boot filename.
                              Auto-determined by variant if not provided.
  10. To program the default image files (dey-image-qt):

    $ ./install_linux_fw_uuu.sh
  11. Once the firmware is installed, the device boots automatically. The default username is root with no password.

Program the firmware using uSD card

  1. Decompress the zip file.

  2. Place the decompressed files in the root of a FAT-formatted microSD card and insert it in the microSD socket of the board.

  3. Reset the device by pressing the reset button on the board and immediately press any key in the serial terminal to stop the auto-boot process. The U-Boot bootloader prompt displays:

    U-Boot SPL dub-2023.04-r3.2 (Jan 30 2024 - 10:57:23 +0000)
    SOC: 0xa1009300
    LC: 0x2040010
    PMIC: Over Drive Voltage Mode
    M33 prepare ok
    Normal Boot
    Trying to boot from BOOTROM
    Boot Stage: Primary boot
    image offset 0x0, pagesize 0x200, ivt offset 0x0
    Load image from 0x4f400 by ROM_API
    NOTICE:  BL31: v2.8(release):lf-6.1.55-2.2.0-0-g08e9d4eef226-dirty
    NOTICE:  BL31: Built : 16:47:44, Jan 30 2024
    
    
    U-Boot dub-2023.04-r3.2 (Jan 30 2024 - 10:57:23 +0000)
    
    CPU:   i.MX93(52) rev1.1 1700 MHz (running at 1692 MHz)
    CPU:   Industrial temperature grade (-40C to 105C) at 42C
    Reset cause: POR (0x1)
    DRAM:  992 MiB
    Core:  202 devices, 29 uclasses, devicetree: separate
    MMC:   FSL_SDHC: 0, FSL_SDHC: 1
    In:    serial
    Out:   serial
    Err:   serial
    Model: Digi ConnectCore 93 Development Kit
    ConnectCore 93 SOM variant 0x01: 992 MiB LPDDR4, Wi-Fi, Bluetooth
    Boot:  MMC0
    
    BuildInfo:
      - ELE firmware version 0.1.0-44880904
    
    flash target is MMC:0
    Net:   eth0: ethernet@428a0000 [PRIME]
    Fastboot: Normal
    Normal Boot
    Hit any key to stop autoboot:  0
    => 
    Information in the console log may vary.
  4. To install the default firmware images (dey-image-qt) into the internal eMMC, run the following command:

    => run install_linux_fw_sd

    To program other images, set the variable image-name to the DEY image name (such as dey-image-webkit or core-image-base) before running the script.

    => setenv image-name core-image-base
    => run install_linux_fw_sd
  5. Once the firmware is installed, the device boots automatically. The default username is root with no password.

    During installation, error messages appear when the installation process attempts to override MAC addresses. These messages are expected.

    ## Resetting to default environment
    oldval: 00:40:9D:7D:17:9A  defval: 00:04:f3:ff:ff:fa
    ## Error: Can't overwrite "ethaddr"
    himport_r: can't insert "ethaddr=00:04:f3:ff:ff:fa" into hash table
    oldval: 00:40:9D:7D:17:9B  defval: 00:04:f3:ff:ff:fb
    ## Error: Can't overwrite "eth1addr"
    himport_r: can't insert "eth1addr=00:04:f3:ff:ff:fb" into hash table
    oldval: 00:40:9D:7D:17:9C  defval: 00:04:f3:ff:ff:fc
    ## Error: Can't overwrite "wlanaddr"
    himport_r: can't insert "wlanaddr=00:04:f3:ff:ff:fc" into hash table
    oldval: 00:40:9D:7D:17:9D  defval: 00:04:f3:ff:ff:fd
    ## Error: Can't overwrite "btaddr"
    himport_r: can't insert "btaddr=00:04:f3:ff:ff:fd" into hash table

Program the firmware using USB mass storage

Follow these steps to install Yocto in the device:

  1. Decompress the zip file.

  2. Place the decompressed files in the root of a FAT-formatted USB mass storage and insert it in the USB host connector of the board.

  3. Reset the device by pressing the reset button on the board and immediately press any key in the serial terminal to stop the auto-boot process. The U-Boot bootloader prompt displays:

    U-Boot SPL dub-2023.04-r3.2 (Jan 30 2024 - 10:57:23 +0000)
    SOC: 0xa1009300
    LC: 0x2040010
    PMIC: Over Drive Voltage Mode
    M33 prepare ok
    Normal Boot
    Trying to boot from BOOTROM
    Boot Stage: Primary boot
    image offset 0x0, pagesize 0x200, ivt offset 0x0
    Load image from 0x4f400 by ROM_API
    NOTICE:  BL31: v2.8(release):lf-6.1.55-2.2.0-0-g08e9d4eef226-dirty
    NOTICE:  BL31: Built : 16:47:44, Jan 30 2024
    
    
    U-Boot dub-2023.04-r3.2 (Jan 30 2024 - 10:57:23 +0000)
    
    CPU:   i.MX93(52) rev1.1 1700 MHz (running at 1692 MHz)
    CPU:   Industrial temperature grade (-40C to 105C) at 42C
    Reset cause: POR (0x1)
    DRAM:  992 MiB
    Core:  202 devices, 29 uclasses, devicetree: separate
    MMC:   FSL_SDHC: 0, FSL_SDHC: 1
    In:    serial
    Out:   serial
    Err:   serial
    Model: Digi ConnectCore 93 Development Kit
    ConnectCore 93 SOM variant 0x01: 992 MiB LPDDR4, Wi-Fi, Bluetooth
    Boot:  MMC0
    
    BuildInfo:
      - ELE firmware version 0.1.0-44880904
    
    flash target is MMC:0
    Net:   eth0: ethernet@428a0000 [PRIME]
    Fastboot: Normal
    Normal Boot
    Hit any key to stop autoboot:  0
    => 
    Information in the console log may vary.
  4. To install the default firmware images (dey-image-qt) into the internal eMMC, run the following command:

    => run install_linux_fw_usb

    To program other images, set the variable image-name to the DEY image name (such as dey-image-webkit or core-image-base) before running the script.

    => setenv image-name core-image-base
    => run install_linux_fw_usb
  5. Once the firmware is installed, the device boots automatically. The default username is root with no password.

    During installation, error messages appear when the installation process attempts to override MAC addresses. These messages are expected.

    ## Resetting to default environment
    oldval: 00:40:9D:7D:17:9A  defval: 00:04:f3:ff:ff:fa
    ## Error: Can't overwrite "ethaddr"
    himport_r: can't insert "ethaddr=00:04:f3:ff:ff:fa" into hash table
    oldval: 00:40:9D:7D:17:9B  defval: 00:04:f3:ff:ff:fb
    ## Error: Can't overwrite "eth1addr"
    himport_r: can't insert "eth1addr=00:04:f3:ff:ff:fb" into hash table
    oldval: 00:40:9D:7D:17:9C  defval: 00:04:f3:ff:ff:fc
    ## Error: Can't overwrite "wlanaddr"
    himport_r: can't insert "wlanaddr=00:04:f3:ff:ff:fc" into hash table
    oldval: 00:40:9D:7D:17:9D  defval: 00:04:f3:ff:ff:fd
    ## Error: Can't overwrite "btaddr"
    himport_r: can't insert "btaddr=00:04:f3:ff:ff:fd" into hash table