Jetson agx GPIO ports 8 and 9 of the device do not work for uart

During use, I found that the interface using uart communication in the gpio port of xavier agx does not work properly. Can I specify other IO ports to work instead of the uart interface?

The same code works fine on jetson nano,When the jetson agx device is connected with a usb to TTL device, does the PWM signal light work? But under normal circumstances, the PWM does not light up when the usb is connected

hello 18981275647,

Xavier is using combined uart, you may use the micro usb port, J501 to access to the UART console.
please see-also Jetson AGX Xavier Developer Kit User Guide for reference.

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