Disable general uarta:serial@3100000 in device tree of Orin Nano

Autonomous Machines Jetson & Embedded Systems Jetson Orin Nano
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1

Hi guys,

I need to modify device tree of Orin Nano 8GB Devkit for custom board in Jetpack 6.0 to disable General UART.

I converted the final tegra234-p3768-0000+p3767-0005-nv.dtb to .dts and see 3 port are enabled, i think them should be:
uarta:serial@3100000 → General UART
uarte:serial@3140000 → M.2 Key
uarti:serial@31d0000 → Debug

Whether i only need to disable uarta:serial@3100000, right?

Additionally, refer this doc:
https://elinux.org/Jetson/L4T/peripheral/#Mapping_3

Should i need to add more uartb@3110000 for M.2 and uartc@c280000 for Debug, instead for uarti:serial@31d0000 and uarte:serial@3140000 ?

Thanks so much!

4

Hi thanhdq,

Do you mean that you are using the devkit or custom board for Orin Nano?

May I know what’s your use case to disable uarta:serial@3100000?
This is the UART from 40-pins expansion header on the devkit.

For debug, the Tegra Combined Uart (/dev/ttyTCU0) should be enabled by default.

5

Hi KevinFFF,
Thank for your reply!

I am porting for a custom board which is based on the devkit with some modifies.

To be honest, i don’t know reality use case, but target is porting

  • One UART from M.2 key E to Camera Connector
  • One UART from Expansion Connector(General UART) need to be disabled.
  • One UART from Debug to be kept.

As i said above, but I don’t know why i don’t see uartc@c280000 was enabled in converted .dts file.

6

You can just disable this node through modifying its status to disabled.

M.2 Key E should be uartb@3110000

It is disabled by default as expected since this node is used when the debug UART port is not used by Tegra Combined Uart.

7

Hi KevinFFF,
I see, thanks a lot!