Jetson Orin Nano Dev Board: Missing Device Tree Sources in JetPack 6.0

Issue Overview

Users are experiencing issues related to missing device tree sources after upgrading to JetPack 6.0 for the Nvidia Jetson Orin Nano Dev board. Specifically, the following symptoms have been reported:

• Errors indicating that specific device tree files are no longer present in the source tree:
  • tegra234-p3509-a02-pcie.dtsi
  • tegra234-p3509-a02.dtsi
  • tegra234-p3768-0000-a0-pcie.dtsi
  • tegra234-p3768-0000-a0.dtsi
  • tegra234-p3768-camera-rbpcv2-imx219.dtsi

These errors occur during the setup of a Yocto build system, particularly when users attempt to apply patches to these device trees. The issue seems to stem from a transition between major JetPack versions, leading to the deprecation or modification of previously existing device trees.

The impact of this problem is significant, as it prevents users from successfully applying their patches, thereby hindering development and deployment processes. Users have expressed confusion about where to locate the new or modified device trees and how to transition their existing patches.

Possible Causes

Several potential causes for the issue have been identified:

• Deprecation of Device Trees: The new BSP (Board Support Package) with JetPack 6.0 may not include certain device trees that were present in earlier versions (e.g., JetPack 5), leading to missing files during the build process.

• Changes in Device Tree Structure: Major version upgrades often involve significant changes in device tree structures, which can result in the complete removal of certain files without direct replacements.

• Lack of Documentation: There may be insufficient documentation regarding changes between JetPack versions, making it difficult for users to find updated device trees or understand how their patches should adapt.

Troubleshooting Steps, Solutions & Fixes

To address the issue of missing device tree sources, users can follow these troubleshooting steps and solutions:

1. Verify JetPack Version:

   • Ensure that you are using JetPack 6.0 and that your environment is set up correctly for this version.

2. Check for Updated Device Trees:

   • Investigate the hardware directory within the source code for JetPack 6.0, as new device trees may be located there.
   • Use commands such as:

     find /path/to/jetpack/source -name "*.dtsi"
     

3. Consult Release Notes:

   • Review the release notes for JetPack 6.0 to identify any documented changes regarding device trees and their mappings.

4. Contact Support:

   • If further assistance is needed, consider reaching out to Ridgerun for Yocto-related support specific to Nvidia Jetson platforms.

5. Adapt Existing Patches:

   • Transition your patches by identifying equivalent functionality in the new device trees.
   • If necessary, modify your patches to align with the updated structures.

6. Community Engagement:

   • Engage with community forums or Nvidia’s developer forums to seek advice from other users who may have encountered similar issues.

7. Documentation and Resources:

   • Refer to official Nvidia documentation regarding Yocto support and device tree management for additional guidance.
   • Keep an eye on updates from Nvidia regarding future releases that may address these concerns.

8. Best Practices:

   • Regularly back up your patches and document any changes made during transitions between major versions.
   • Stay informed about future updates or changes in Nvidia’s release cycles that may affect your development environment.

By following these steps, users can better navigate the challenges posed by missing device tree sources and ensure a smoother development experience with the Nvidia Jetson Orin Nano Dev board.