I want to use DMA on UART. (AGX ORIN, JETPACK 6.0)

[salary_korea]

I want to use DMA on UART.
but, Looking at tegra234.dtsi, there is no DMA related contents in UART settings (only PIO part).

Looking at the boot log, all UARTs are operating in PIO mode.

How do I eanble UART DMA mode?

[KevinFFF]

Hi salary_korea,

Are you using the devkit or custom board for AGX Orin?

Please refer to UARTA DMA - Not enabled by default and doesn't work in JP6 - #3 by KevinFFF to enable DMA for UARTA in JP6.

[salary_korea]

I’m using custrom carrier board for AGX orin
Can you provide dts example of DMA transfer for UART4(serial@3130000)
And I’m using JETPACK 6.0(L4T36.3)

[KevinFFF]

It seems uartd(serial@3130000) is not enabled in device tree of R36.3.0.

Please confirm which UART interface are you using.
Is the following one?

Please also share the full dmesg for further check.