Exposing Verdin AM625 UART 4 to Linux

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Hello,

To configure UART4 on your Verdin AM625 module for general-purpose use instead of as a Linux debug console, you’ll need to make some adjustments in both the U-Boot environment and the Linux kernel command line. Here’s a step-by-step guide to help you achieve this:

1. Disable U-Boot Console Output on UART4:

   • Interrupt the boot process to access the U-Boot prompt.
   • Use the setenv command to modify the console environment variable. If UART4 is currently set as the console, it might appear as console=ttyS3,115200. You should remove or change this setting.
   • Save your changes with saveenv and reboot the system.

2. Disable Linux Kernel Console Output on UART4:

   • Modify the kernel command line to ensure it does not reference UART4 as a console. This can be done by editing the boot parameters in U-Boot or using fw_setenv in Linux to adjust the console parameter.
   • Ensure that the console parameter does not include ttyS3 or the equivalent for UART4.

3. Device Tree Configuration:

   • Verify that your device tree is correctly configured to enable UART4 as a general-purpose UART. Your current configuration seems to enable it, but ensure no other settings are overriding this.
   • Double-check that the pinmux settings are correct and that no other device is using the same pins.

4. Disable Serial Getty:

   • If a serial getty is running on UART4, it will need to be disabled. You can do this by masking the service using systemctl mask serial-getty@ttyS3.service.

By following these steps, you should be able to configure UART4 for general-purpose use. If you encounter any issues, it might be helpful to review each configuration step to ensure there are no conflicting settings.

I hope this helps! If you have any more questions or need further assistance, feel free to ask.

Best regards,
Toradex AI Assistant

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

/dev/verdin-uart1 does not exist

I’m trying to apply a device tree overlay to a Yocto build for a verdin-am62 module. Previously, I was using the torizoncore builder to build my image, using the same device tree and overlay in my tcbuild.yaml file, like this device-tree: # >> Directories where to look for include files. include-dirs: - linux/include/ # >> Custom device tree source: custom: linux/arch/arm64/boot/dts/ti/k3-am625-verdin-wifi-dahlia.dts # >> Device-tree overlays configuration: overlay…

https://www.kernel.org/pub/linux//kernel/v6.x/ChangeLog-6.5.3

Verdin UART1 issue on yocto build.