Finding /bootloader/generic/BCT/ directory

Issue Overview

Users are experiencing difficulty locating the <l4t_top>/bootloader/generic/BCT/ directory while attempting to generate and move Pinmux Device Tree Source Interface (dtsi) files for the Nvidia Jetson Orin Nano Development Board. The issue arises during the setup process, specifically when users are following instructions to configure GPIO pins and move necessary files to specific directories.

Symptoms include:

• Inability to find the specified directories using commands like sudo find.
• Confusion regarding the necessity of an x86 host PC for flashing the Jetson device.
• Concerns about data loss when reflashing the board.

The problem appears to be consistent among multiple users, indicating a common challenge in navigating the file structure or understanding the requirements for setup. The impact on user experience is significant, as it hampers progress in development tasks that depend on proper configuration of hardware interfaces.

Possible Causes

• Hardware Incompatibilities or Defects: Users may be using unsupported configurations or hardware that does not align with Jetson’s requirements.

• Software Bugs or Conflicts: Issues may arise from bugs in the JetPack version being used (e.g., JetPack 6.0) or conflicts with other installed software.

• Configuration Errors: Incorrect setup procedures or misunderstandings about the directory structure can lead to users being unable to locate necessary files.

• Driver Issues: Outdated or incompatible drivers may prevent proper communication between the Jetson board and the host PC.

• Environmental Factors: Power supply issues or overheating could affect performance and functionality.

• User Errors or Misconfigurations: Misunderstanding instructions or failing to follow steps correctly can lead to these issues.

Troubleshooting Steps, Solutions & Fixes

1. Verify Host PC Requirements:

   • Ensure you are using a compatible x86 host PC with Ubuntu installed, as other distributions (like Arch-based systems) are not guaranteed to work.
   • Install the SDK Manager on your host PC if not already done.

2. Locate Directories:

   • Use the following command to search for bootloader directories:

     sudo find / -type d -name "bootloader"
     

   • If no results are found, confirm that you have installed all necessary components via SDK Manager.

3. Check JetPack Version:

   • Confirm that you are using JetPack 6.0, as this version may have specific requirements for file locations and GPIO configurations.
   • Refer to the NVIDIA documentation for compatibility notes.

4. Reflash Procedure:

   • If flashing is necessary, back up any important data from your SD card before proceeding, as reflashing will erase existing data.
   • Follow the official NVIDIA guide for flashing your device using SDK Manager.

5. GPIO Configuration:

   • For configuring GPIO pins, refer to the "Configuring the Jetson Expansion Headers" section in the NVIDIA Jetson Linux Developer Guide.
   • If needing 5V output and currently getting only 3.3V from pin 33, consult the P3768_A04 schematic for alternative pins that can provide higher voltage outputs.

6. Documentation and Resources:

   • Access relevant documentation through NVIDIA’s developer site for detailed guides on setup and configuration.
   • Check for firmware updates or driver patches that may resolve existing issues.

7. Best Practices:

   • Always ensure your host environment is set up correctly before starting development work.
   • Regularly check for updates from NVIDIA regarding JetPack and related tools.

8. Unresolved Aspects:

   • Some users still express confusion over alternative methods for GPIO configuration; further clarification from NVIDIA may be needed.
   • Continued issues with voltage output suggest a need for additional troubleshooting specific to hardware capabilities.

By following these steps, users should be able to address their issues with locating directories and configuring their Nvidia Jetson Orin Nano Development Board effectively.