How can use earlycon in the agx xavier

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
1

Hi,

I hope to see log with earlycon from uart1 in the expansion header.

I have tried to add earlycon to /boot/extlinux/extlinux.conf as following, but, it show logs from UEFI and login shell after finish booting.

earlycon=uart

BR,
Mark

2

Hello,

Welcome to the NVIDIA Developer forums! Your topic will be best served in the Jetson category.

I will move this over for visibility.

Cheers,
Tom

4

Hi bchoi2,

Are you using the devkit or custom board for AGX Xavier?
What’s your Jetpack version in use?

Do you mean that you want to get debug messages on the following UART?

image
image2533×49 4.96 KB

5

Hi Keven,

I am using Leetop agx-xavier which have 1 uart in the expansion header. pinmap of expansion header is the same nvidia agx-xavier.

expansion header 1 uart is uart1. but, agx-xavier would use tegra_comb_uart as a earlycon.

I looked into dts file of difference between leetop agx-xavier and nvidia agx-xavier and didn’t find any changes for uart configuration and major device configuration. so, I am sure uart configuration would the same.

When I log with uart1 on the expansion header, it only show login prompt after UEFI logs which are very simple.

I don’t know which port is tegra_comb_uart and whether uart1 can be used as ealrycon as well.

BR,
Mark

6

It seems you are using the custom carrier board.

I would suggest you could ask your vendor for the debug UART port.

For AGX Xavier devkit, customer could use Micro-USB port for debug UART as following:
NVIDIA Jetson Xavier - Serial Console (ridgerun.com)

8

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.