Disk Encryption Not Working on Nvidia Jetson Orin Nano Dev Board

Issue Overview

Users have reported difficulties in enabling disk encryption on the Nvidia Jetson Orin Nano Dev Board, particularly when flashing the device with NVMe encryption. The primary symptoms include:

• Errors during the flashing process: Users encounter messages indicating failure to extract the EKB (Encryption Key Blob) image, such as "Tried all EKB_RKs but still can’t extract the EKB image."
• Black screen on boot: After a seemingly successful flash, users experience a black screen when attempting to boot the device.
• Warnings from OP-TEE: Messages indicating potential security issues and configuration warnings are common, such as "This OP-TEE configuration might be insecure."

The issue arises during the setup phase, specifically when following the flashing procedures outlined in the Nvidia documentation. Users have noted that they are using Jetson Linux R35.5.0 and have followed various steps to generate necessary keys and images for disk encryption.

Possible Causes

Several potential causes for these issues have been identified:

• Configuration Errors: Incorrect modifications to scripts like example.sh can lead to improper key generation or missing parameters.

• Driver Issues: Incompatibilities or bugs in the software stack, particularly with OP-TEE or related components.

• Key Management Problems: Using default keys (e.g., all zeros) instead of properly generated keys can prevent successful encryption and decryption processes.

• Environmental Factors: Issues related to power supply or hardware compatibility may also affect the flashing process.

• User Errors: Misconfigurations during the flashing process or misunderstanding of required parameters can lead to failures.

Troubleshooting Steps, Solutions & Fixes

To address the disk encryption issues on the Nvidia Jetson Orin Nano Dev Board, follow these comprehensive troubleshooting steps:

1. Verify Environment Setup:

   • Ensure that you are using the correct version of Jetson Linux (R35.5.0).
   • Check for any updates or patches related to your specific version.

2. Review and Modify example.sh:

   • Ensure that you have correctly set up your keys in example.sh. For T234 boards:

     echo "2d4a614e645267556b58703273357638792f423f4428472b4b6250655368566d" > oem_k1.key
     echo "bad66eb4484983684b992fe54a648bb8" > fv_ekb_t234
     echo "f0e0d0c0b0a0010203040506070809aa" > sym2_t234.key
     

   • Ensure that you uncomment necessary lines for auth_t234.key if required by your setup.

3. Generate EKS Image:

   • Run the following command to generate your EKS image:

     python3 gen_ekb.py -chip t234 -oem_k1_key oem_k1.key \
             -fv fv_ekb_t234 \
             -in_sym_key sym_t234.key \
             -in_sym_key2 sym2_t234.key \
             -in_auth_key auth_t234.key \
             -out eks_t234.img
     

4. Update Flash Configuration:

   • Modify NUM_SECTORS in flash_l4t_t234_nvme_rootfs_enc.xml to ensure it reflects your NVMe size accurately:

     <NUM_SECTORS>1000215216</NUM_SECTORS>
     

5. Flashing Process:

   • Execute the following commands sequentially:

     cd Linux_for_Tegra
     sudo ./tools/kernel_flash/l4t_initrd_flash.sh --network usb0 --showlogs --no-flash -p "-c bootloader/t186ref/cfg/flash_t234_qspi.xml" jetson-agx-orin-devkit internal
     sudo cp bootloader/eks_t234_sigheader.img.encrypt ./tools/kernel_flash/images/internal/
     sudo ROOTFS_ENC=1 ./tools/kernel_flash/l4t_initrd_flash.sh --network usb0 --showlogs --no-flash --external-device nvme0n1p1 \
         -c ./tools/kernel_flash/flash_l4t_t234_nvme_rootfs_enc.xml -S 400GiB --external-only --append \
         jetson-agx-orin-devkit external
     sudo ./tools/kernel_flash/l4t_initrd_flash.sh --network usb0 --showlogs --flash-only
     

6. Check Flash Log for Errors:

   • After flashing, review any logs generated during the process for additional error messages or warnings.

7. Test Booting:

   • Attempt to boot the device again after ensuring all steps were followed correctly.

8. Use of Custom Keys:

   • If using custom keys, ensure they are generated correctly and referenced properly in your scripts.

9. Consult Documentation and Forums:

   • Review Nvidia’s official documentation and community forums for any updates or similar issues reported by other users.

10. Further Investigation:

    • If issues persist, consider reaching out to Nvidia support or checking for more recent discussions on forums regarding similar problems.

By following these steps, users should be able to troubleshoot and resolve disk encryption issues on their Nvidia Jetson Orin Nano Dev Boards effectively.