How to modify the knernel on the flash pc ,so USART0 can be on automaticlly?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin NX
1

Hi,
After this post ,I try to modify the dtb files on my flash pc ,so the Orin NX UART0 can be on automaticlly.And I encountered some hitbacks .
Here is my steps.
1.Like the post ,I edited the dtb files on the flash pc.

I cannot attach dtb files here. So just changed the extension to txt. The file content is exact.
temp.dts.txt (431.6 KB)

kernel_tegra234-p3767-0000-p3768-0000-a0.dtb.txt (338.7 KB)
2.I flash the Orin NX.
flash_1-1_0_20240401-223857.log (40.7 KB)
3.I cannot find ttyTHS1 in /dev.
Here is the dtb file in the Orin NX.
kernel_tegra234-p3767-0000-p3768-0000-a0.dtb.txt (338.7 KB)
After I decompile it,I can see the status of serial@3110000 is still disabled.How come?

Any help is welcome.
Thank you.

3

How did you flash it?
Did you replace the dtb file in BSP?

4
  1. I use this command to flash.
sudo ./tools/kernel_flash/l4t_initrd_flash.sh --external-device nvme0n1p1   -c tools/kernel_flash/flash_l4t_external.xml -p "-c bootloader/t186ref/cfg/flash_t234_qspi.xml"   --showlogs --network usb0 jetson-orin-nano-devkit internal

2.I replaced the files in my fash pc in Linux_for_Tegra/rootfs/boot.
But I did not change the files in the Orin NX.

5

You need to replace the file under Linux_for_Tegra/kernel/dtb/, not Linux_for_Tegra/rootfs/boot/.

6

Hi,

Your solution works. Problem solved. /dev/ttyTHS1 is showing in device nodes.

Thank you

8

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