Device Tree File Issues with JetPack 6 on Nvidia Jetson Orin Nano

Issue Overview

Users have reported difficulties related to device tree files while using the Nvidia Jetson Orin Nano with JetPack 6. The primary symptoms include confusion about where to place custom device tree files, particularly for peripherals like cameras. Specifically, users noted that files added to the Linux_for_Tegra/source/public/hardware/nvidia/platform/t23x/p3768/kernel-dts directory were not being utilized as expected. Instead, JetPack 6 appears to reference files from a different directory: Linux_for_Tegra/source/kernel/kernel-jammy-src/arch/arm64/boot/dts/nvidia. This inconsistency has led to uncertainty about proper configuration, especially for adding custom overlays or device trees.

The issue arises during setup and configuration phases, particularly when users attempt to integrate additional hardware. Users have expressed frustration with the lack of clear documentation regarding the correct file paths and build processes for device trees in JetPack 6, which impacts their ability to effectively utilize the hardware.

Possible Causes

• Hardware Incompatibilities: Some users reported issues with third-party carrier boards that may not fully support all features of the Jetson Orin Nano.
• Software Bugs: As JetPack 6 is still in a developer preview phase, there may be unresolved bugs affecting device tree handling.
• Configuration Errors: Incorrect placement of device tree files or overlays can lead to them not being recognized by the system.
• Driver Issues: Outdated or incompatible drivers may prevent proper communication between the hardware and software.
• User Misconfigurations: Users may inadvertently misconfigure their setups, especially if they are transitioning from previous versions of JetPack.

These factors can contribute to the observed problems with device tree file recognition and functionality.

Troubleshooting Steps, Solutions & Fixes

1. Verify Device Tree Location:

   • Ensure that custom device tree files are placed in the correct directory. For JetPack 6, confirm that you are using Linux_for_Tegra/source/hardware/nvidia/t23x/nv-public/overlay/ for overlays.

2. Build Device Tree:

   • Use the nvbuild.sh script to build your device tree. This script typically generates files in kernel/kernel-jammy-src/arch/arm64/boot/dts/nvidia. Make sure you are executing this script from the correct directory:

     cd Linux_for_Tegra/source
     ./nvbuild.sh
     

3. Check Documentation:

   • Refer to the NVIDIA Jetson Linux Developer Guide for specific instructions on building kernel images and device trees. This guide provides step-by-step procedures relevant to your version of JetPack:
     • Kernel Customization — NVIDIA Jetson Linux Developer Guide

4. Recovery Mode Booting:

   • If you encounter issues during booting after flashing, ensure that your board is in recovery mode before initiating the flash process. Connect pins 9 and 10 correctly as per the documentation.

5. Export Logs for Debugging:

   • If errors occur during flashing or building processes, use the SDK Manager’s "EXPORT LOGS" feature to gather relevant logs for troubleshooting:

     sdkmanager --export-logs
     

6. Testing with Different Configurations:

   • Isolate issues by testing with different hardware configurations or reverting to a previous version of JetPack (e.g., JetPack 5) if persistent problems occur.

7. Community Support:

   • Engage with community forums or NVIDIA support channels for additional insights and shared experiences from other users who may have faced similar issues.

8. Best Practices:

   • Regularly check for updates on both software and documentation from NVIDIA.
   • Maintain backups of working configurations and document changes made during troubleshooting.

By following these steps, users can effectively diagnose and resolve issues related to device tree files on their Nvidia Jetson Orin Nano development boards.