Disable console output on Uart A

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To fully disable console output on UART A during reboot and shutdown on your Colibri iMX7 512MB V1.1D with Linux BSP 5.7.6 (dunfell), you can try the following steps:

  1. Kernel Boot Parameters: Modify the kernel boot parameters to suppress console messages. You can add console=null or quiet to the kernel command line. This can be done by editing the U-Boot environment variable bootargs. For example:

    setenv bootargs 'console=null'
saveenv

  2. U-Boot Configuration: Ensure that the U-Boot environment is correctly set to not pass any console parameters to the kernel. Double-check that there are no conflicting settings that might re-enable console output.

  3. Kernel Configuration: If the above steps do not resolve the issue, you may need to reconfigure the kernel to ensure that it does not output messages to the console during shutdown or reboot. This might involve recompiling the kernel with specific options disabled.

  4. Device Tree: Review the device tree configuration to ensure that UART A is not being used for console output. This might involve modifying the device tree source to disable the console on UART A.

By following these steps, you should be able to suppress the unwanted console output on UART A during system reboot and shutdown.

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

Disable serial console apalis imx6.