JP6.0 can't load customized dtbo?

Autonomous Machines Jetson & Embedded Systems Jetson Orin NX
1

Hi NV_Team,

We modify the kernel_tegra234-p3768-0000+p3767-0000-nv.dtb to match our ONX cvb, and add a csi camera dtbo.

The /boot/dtb/kernel_tegra234-p3768-0000+p3767-0000-nv.dtb loaded success, but /boot/tegra234-p3767-camera-p3768-gmsl-4lanes.dtbois not loaded.

How to debug this ?

(base) nvidia@nvidia-desktop:~$ cat /boot/extlinux/extlinux.conf
TIMEOUT 30
DEFAULT primary

MENU TITLE L4T boot options

LABEL primary
      MENU LABEL primary kernel
      LINUX /boot/Image
      FDT /boot/dtb/kernel_tegra234-p3768-0000+p3767-0000-nv.dtb
      INITRD /boot/initrd
      APPEND ${cbootargs} root=PARTUUID=dd89c62a-c22d-4f68-8cc5-e2444425819e rw rootwait rootfstype=ext4 mminit_loglevel=4 console=ttyTCU0,115200 firmware_class.path=/etc/firmware fbcon=map:0 net.ifnames=0 nospectre_bhb video=efifb:off console=tty0 
      OVERLAYS /boot/tegra234-p3767-camera-p3768-twgmsl-4lanes.dtbo

tegra234-p3767-camera-p3768-twgmsl-4lanes.dts

// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: Copyright (c) 2023-2024, Fangzhu Technology CORPORATION & AFFILIATES. All rights reserved.

/dts-v1/;
/plugin/;

#define CAM0_PWDN	TEGRA234_MAIN_GPIO(H, 6) //CAM0_PWDN
#define CAM0_PWDN	TEGRA234_MAIN_GPIO(AC, 0) //CAM0_PWDN 

#include <dt-bindings/tegra234-p3767-0000-common.h>
#include "tegra234-camera-twgmsl-4lanes.dtsi"

/ {
	overlay-name = "Camera GMSL GMSL 4Lanes";
	jetson-header-name = "Jetson 24pin CSI Connector";
	compatible = JETSON_COMPATIBLE_P3768;

	fragment-camera-twgmsl@0 {
		target-path = "/";
		__overlay__ {

			gpio@2200000 {
				cam-pwdn-low {
					gpio-hog;
					output-low;
					gpios = <CAM0_PWDN 0 CAM0_PWDN 0>;
					label = "cam0-pwdn", "cam1-pwdn";
				};
			};
			
			bus@0 {
				i2c@3180000 {
					reg = <0>;
					#address-cells = <1>;
					#size-cells = <0>;
					........
				};
			};
		};
	};
};
3

Hi Luna2020,

Could you try to add the overlay dtb from board config file as following?
In p3767.conf.common:

- OVERLAY_DTB_FILE="L4TConfiguration.dtbo,tegra234-carveouts.dtbo,tegra-optee.dtbo";
+ OVERLAY_DTB_FILE="L4TConfiguration.dtbo,tegra234-carveouts.dtbo,tegra-optee.dtbo,tegra234-p3767-camera-p3768-gmsl-4lanes.dtbo";

and reflash the board to apply the change.

4

Hi KevinFFF,

Okay, I will try later, can we just re-flash dtb with dtbo ? Because we have many files in the SSD.

5

For Jetpack 6.0GA, the dtb is loaded from UEFI so that you should reflash the bootloader partition to apply the change for DTB.

7

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