BSP 35.6.2: L4TLauncher does not find extlinux.conf

Robotics & Edge Computing Jetson Systems Jetson AGX Xavier
16

As I said, it happens with the bare BSP, no changes… only a little fix for the flash .sh script trying to generate ssh keys with an outdated algorithm (shown on the log).

Logs below.

Xterm.log.df-laptop.2025.09.11.12.17.54-lean.txt (494.3 KB)

tio_ttyUSB3_2025-09-11T12:25:19.txt (83.9 KB)

Same results:

Jetson UEFI firmware (version 6.2-40633251 built on 2025-05-16T01:35:20+00:00)
ESC   to enter Setup.
F11   to enter Boot Manager Menu.
Enter to continue boot.
**  WARNING: Test Key is used.  **
......
      L4TLauncher: Attempting Direct Boot
OpenAndReadUntrustedFileToBuffer: Failed to open boot\extlinux\extlinux.conf: No
t Found
ProcessExtLinuxConfig:sds Failed to Authenticate boot\extlinux\extlinux.conf (No
t Found)
L4TLauncher: Unable to process extlinux config: Not Found
L4TLauncher: Attempting Kernel Boot
EFI stub: Booting Linux Kernel...
EFI stub: Using DTB from configuration table
EFI stub: Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path
EFI stub: Exiting boot services and installing virtual address map...

Doing the sha1sum for extlinux.conf both on the system.img.raw and on the jetson devkit:

$ mkdir mnt

$ sudo mount -o loop bootloader/system.img.raw mnt

$ cat mnt/boot/extlinux/extlinux.conf
TIMEOUT 30
DEFAULT primary

MENU TITLE L4T boot options

LABEL primary
      MENU LABEL primary kernel
      LINUX /boot/Image
      FDT /boot/dtb/kernel_tegra194-p2888-0001-p2822-0000.dtb
      INITRD /boot/initrd
      APPEND ${cbootargs} root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 mminit_loglevel=4 console=ttyTCU0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 rootfstype=ext4 video=efifb:off 

# When testing a custom kernel, it is recommended that you create a backup of
# the original kernel and add a new entry to this file so that the device can
# fallback to the original kernel. To do this:
#
# 1, Make a backup of the original kernel
#      sudo cp /boot/Image /boot/Image.backup
#
# 2, Copy your custom kernel into /boot/Image
#
# 3, Uncomment below menu setting lines for the original kernel
#
# 4, Reboot

# LABEL backup
#    MENU LABEL backup kernel
#    LINUX /boot/Image.backup
#    FDT /boot/dtb/kernel_tegra194-p2888-0001-p2822-0000.dtb
#    INITRD /boot/initrd
#    APPEND ${cbootargs}


$ sha1sum mnt/boot/extlinux/extlinux.conf
bcc85d7d206f07c4ec96bd6e769b42a4585884ab  mnt/boot/extlinux/extlinux.conf

$ sudo umount mnt


sen@vpm-devkit:~$ sha1sum /boot/extlinux/extlinux.conf
bcc85d7d206f07c4ec96bd6e769b42a4585884ab  /boot/extlinux/extlinux.conf

Indeed, you HAVE to fix the EKS partition image IF YOU USE –uefi-keys, when fuses are not burned, in the BSP-35.6.2, as you have to fix some other things too…

See this: