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L4TLauncher: Unable to locate L4T Support protocol: Not Found

  • Updated

Problem

Devices flashed with JetPack 5 are unable to boot past UEFI when booting off NVMe.

Solution

The NVMe should be wiped with dd and then reflashed with the desired JetPack version. 

Procedure (NVMe Connected to Host)

  1. Connect the NVMe to the Linux host machine used to flash the Jetson. This may be done through a M.2 slot on the motherboard or an external USB breakout
  2. Run lsblk to determine the block device name of the NVMe. On your host machine, this can be determined by running lsblk before and after connecting the NVMe. The NVMe will be the newly added block device
  3. Wipe the NVMe by running sudo dd if=/dev/zero of=/dev/<device-file> bs=4M count=3000 status=progress where <device-file> is the name of the block device determined in step 2
  4. Connect the NVMe to the CTI carrier board and reflash with the desired L4T and CTI BSP

Procedure (NVMe Connected to CTI Carrier)

  1. Connect both the USB OTG port and serial UART to the Linux host machine used to flash the Jetson.
  2. Boot the carrier into force recovery mode. Ensure the carrier enumerates on the host with lsusb
  3. Navigate to the Linux_for_Tegra directory on your host machine and run ./flash.sh --rcm-boot cti/<orin_som>/<cti_carrier>/base nvme0n1p1. You can browse the various flash configurations by exploring the Linux_for_Tegra/cti directory. Ensure you omit the .conf from the configuration file path
  4. After the command in step 3 completes, connect to your CTI carrier via the serial debug
  5. Once connected over serial you may be prompted through the Jetson L4T setup, please follow the setup instructions. Afterwards you should be able to login over serial
  6. Once logged in over serial, run lsblk to determine the block device name of the NVMe
  7. Wipe the NVMe by running sudo dd if=/dev/zero of=/dev/<device-file> bs=4M count=3000 status=progress where <device-file> is the name of the block device determined in step 6
  8. Power down the carrier and reflash with the desired L4T and CTI BSP

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