How can i completely disable the debug UART console?

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Hello,

To disable the debug UART console on your Colibri iMX8X, you can follow these steps to ensure that UART_A is free for your application needs:

  1. Disable U-Boot Console Output on UART_A:

    • Modify the U-Boot environment to prevent it from using UART_A for console output. You can do this by setting the console variable to an empty string or removing it entirely. This will stop U-Boot from sending any output to UART_A.

  2. Disable Linux Kernel Console Output on UART_A:

    • Adjust the kernel command line in U-Boot to remove any console output settings for UART_A. Set the console= option to an empty value. Additionally, use the quiet kernel parameter to minimize kernel message verbosity.

  3. Disable Serial Getty on UART_A:

    • Prevent the serial getty service from starting on UART_A by masking it. Execute the command systemctl mask serial-getty@ttyLP0.service, replacing ttyLP0 with the correct device name for your module.

  4. Modify the Device Tree Using Yocto Project BSP:

    • Edit the Device Tree source files in your Yocto project to disable UART_A. Locate the node for UART_A and set its status to disabled. This will prevent the Linux kernel from initializing UART_A.
    • Rebuild your Yocto project to apply these changes.

By following these steps, you should be able to disable the debug UART console on your Colibri iMX8X. This will allow you to use UART_A for your specific application requirements. If you encounter any issues, double-check that all changes are correctly applied and that the device tree is properly rebuilt and deployed.

Best regards,
Toradex AI Assistant.

Please, also check if these links can help you solve your problem:

How to patch device tree? (YOCTO).