Error when loading camera sensor module

Issue Overview

Users are experiencing issues when attempting to load a camera sensor module on the Nvidia Jetson Orin Nano Dev board, particularly with Jetpack 6.0. The main symptoms include multiple "unknown symbol" errors indicating that certain functions related to the tegra-camera module are not recognized. The error messages include:

• Unknown symbol tegracam_v4l2subdev_unregister (err -2)
• Unknown symbol regmap_util_write_table_8 (err -2)
• Unknown symbol tegracam_v4l2subdev_register (err -2)
• Additional similar errors related to other tegra-camera functions.

These errors typically occur when users attempt to load the sensor module via the insmod command after compiling it separately. The issue appears to be linked to missing configurations in the device’s defconfig or problems with building the module as a loadable component.

The impact of this issue is significant, as it prevents users from utilizing camera functionalities, hindering development and application testing on the Jetson platform.

Possible Causes

• Hardware Incompatibilities: There may be discrepancies between the hardware configurations and the expected settings for Jetpack 6.0.

• Software Bugs or Conflicts: There could be bugs in Jetpack 6.0 or conflicts with existing modules that interfere with loading new sensor modules.

• Configuration Errors: Missing or incorrect settings in the device’s defconfig file could prevent proper module loading.

• Driver Issues: The required drivers for the camera sensor may not be properly installed or configured, leading to unresolved symbols.

• User Errors or Misconfigurations: Users may inadvertently misconfigure their environment or fail to follow necessary steps during installation and compilation.

Troubleshooting Steps, Solutions & Fixes

1. Verify Module Dependencies:

   • Ensure that all required modules are loaded before attempting to load the camera sensor module.
   • Use the command:

     lsmod
     

   • Check if tegracam related modules are listed.

2. Check Device Configuration:

   • Review your device’s defconfig settings.
   • Ensure that relevant camera support options are enabled.

3. Compile and Load Modules Correctly:

   • If compiling manually, follow these steps:
     1. Compile your image and modules using:

        make
        

     2. Install using:

        make install
        

     3. Load your custom module using:

        sudo insmod <module_name>.ko
        

4. Use Full Installation for Base Image Changes:

   • If changes are made to the base image, perform a full installation instead of just moving the image file to ensure all dependencies are correctly resolved.

5. Testing with Different Configurations:

   • Test loading the module on a different setup or configuration to isolate whether the issue is specific to your current environment.

6. Review Logs for Additional Errors:

   • Check system logs for any additional error messages that could provide insight into unresolved symbols.
   • Use:

     dmesg | grep nv_sp5508
     

7. Consult Documentation and Community Resources:

   • Refer to Nvidia’s official documentation for Jetpack 6.0 and any relevant forums for updates on known issues or patches.
   • Engage with community forums for additional troubleshooting tips from other users who faced similar issues.

8. Recommended Approach:

   • Users have reported success by compiling images and modules separately and ensuring that all required dependencies are properly handled during installation.

By following these troubleshooting steps, users should be able to diagnose and potentially resolve the issues related to loading camera sensor modules on the Nvidia Jetson Orin Nano Dev board. Further investigation may be needed if problems persist after these steps have been followed.