The ConnectCore 8M Nano is shipped without a default operating system loaded. Only U-Boot is flashed in the device. This step demonstrates how to install Yocto in your ConnectCore 8M Nano.
1. Establish a serial connection with your device
Before you start programming the firmware, you must open a serial connection with the device. You can use any serial terminal program such as Tera Term, Minicom, CoolTerm, or HyperTerminal.
Due to an incompatibility between the USB/serial driver and the PuTTY terminal program, you must use another serial terminal program such as Tera Term, Minicom, CoolTerm, or HyperTerminal. |
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. Program the firmware
Once you have established the serial connection, you can start the firmware update process. Follow these steps to install Yocto in the device:
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Download the firmware images from the following location:
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ConnectCore 8M Nano Development Kit: https://ftp1.digi.com/support/digiembeddedyocto/2.6/r3/images/ccimx8mn-dvk-installer.zip
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Decompress the zip file.
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Place the decompressed files in the root of a FAT-formatted microSD card and insert it in the microSD socket of the board.
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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 dub-2018.03-r5.3 (Oct 20 2020 - 09:24:16 +0000) CPU: Freescale i.MX8MNano Quad rev1.0 1400 MHz (running at 1200 MHz) CPU: Industrial temperature grade (-40C to 105C) at 31C Reset cause: POR DRAM: 1 GiB MCA: HW_VER=1 FW_VER=1.00 MMC: FSL_SDHC: 1, FSL_SDHC: 0 In: serial Out: serial Err: serial Model: Digi ConnectCore 8M Nano Development Kit ConnectCore 8M Nano SOM variant 0x01: 1 GiB LPDDR4, Wi-Fi, Bluetooth, MCA, Crypto-auth Board version undefined, ID undefined Boot: MMC2 BuildInfo: - ATF 65f9d61 - U-Boot dub-2018.03-r5.3 flash target is MMC:0 Net: eth0: ethernet@30be0000 Fastboot: Normal Hit any key to stop autoboot: 0 =>
Information in the console log may vary. -
Install the firmware into the internal eMMC, executing the following command:
=> run install_linux_fw_sd
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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 |