Serial port driver of nvidia jetson xavier nx is dma mode transmission

[13269463917]

May I ask if the current serial port driver of nvidia jetson xavier nx is dma mode transmission, if not, how to modify the serial port driver to satisfy

[DaneLLL]

Hi,
The base setting is in

hardware/nvidia/soc/t19x/kernel-dts/tegra194-soc/tegra194-soc-uart.dtsi

It is dma mode by default since all uart ports have the setting like:

                dmas = <&gpcdma 8>, <&gpcdma 8>;
                dma-names = "rx", "tx";

[13269463917]

thank u，In addition, what is the buffer size of the serial port in dma mode?

[DaneLLL]

Hi,
For more information, please check section 10.4 in technical reference manual. The document is in download center:
https://developer.nvidia.com/embedded/downloads#?search=trm

Xavier Series SoC Technical Reference Manual