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Introduction

Describes how to access your device after it has been flashed. You can use either of the following two connection methods:
  • UART for low-level serial console access
  • ADB for standard shell access

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Connect using UART

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Install Minicom

Minicom is a lightweight, terminal-based serial communication program used on Linux systems to interact with devices over a UART (serial) connection. It allows you to access the device’s console, view boot logs, and send commands directly to the system at a low level. Install Minicom on the host system:

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Connect

  • To set up the debug UART connection and view the diagnostic messages, connect the micro-USB cable from the micro-USB port on the device to the Linux host.
    micro_usb_port
  • Check if the USB port is detected:
    Sample output
  • Open Minicom:
  • Use the Down arrow key to select the Serial port setup option. Use the Up and Down arrow keys to navigate through the menu. serial_port_setup
  • Set up the serial device configuration:
    • Select A on your keyboard to set up the serial device name such as /dev/ttyUSB0.
    • Select Enter to save the changes.
    • Select E on your keyboard to set the baud rate and 8N1 configuration:
      • Select the E key again if the baud rate isn’t set to 115200.
      • Select the Q key if the configuration isn’t set to 8N1. option_Q
    • Select Enter to save the changes.
    • Select F on your keyboard to set the Hardware Flow Control to No. serial_device_configuration
    • Select Enter to save the changes.
  • Select the Save setup as dfl option and then select Enter. save_setup_as_dfl
  • Select EXIT to open the UART console and then select Enter.
  • Sign in to the UART console:
    • Login: root
    • Password: oelinux123
If the sign in console doesn’t display as expected, verify the USB connection. If the issue persists, disconnect and then reconnect the micro-USB.

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Connect using ADB

adbd is disabled on the device by default and must be explicitly enabled before use.

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Install ADB

ADB is used to communicate with a running device and is required to trigger a reboot into EDL mode from the operating system. It provides a convenient way to transition the device into the correct state for flashing without manual intervention.
  • Install adb on your host system using the system package manager:
  • Verify if adb is installed on your system:
    Sample output
  • The adbd service is disabled by default. A one-time setup is required to enable the service before adb can be used.
    • Connect to the device by following the Connect via UART guide.
    • Create the file /etc/usb-debugging-enabled to enable adbd.
    • Configure the adbd service to start automatically.

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Connect

  • Connect the device using the USB Type-C cable to the host computer.
  • Ensure that the device is recognized as a device by adb:
    Sample output
  • Connect to an adb shell: