How to modify the boot logo with JetPack_5.0.2_Linux_JETSON_XAVIER_NX_TARGETS

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
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How to modify the boot logo with JetPack_5.0.2_Linux_JETSON_XAVIER_NX_TARGETS

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Hello, this topic belongs here: Jetson & Embedded Systems - NVIDIA Developer Forums

I will move it over for you.

1 Like
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Hi 2398492542,

Are you using the devkit or custom board for Xavier NX?

Please refer to the following instruction.
UEFI Adaptation — Jetson Linux
Developer Guide 34.1 documentation (nvidia.com)

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Hi,I want to remove uboot logo jetpack_5.1.1. HOW to deal with?

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For Jetpack 5, we uses UEFI as bootloader instead of uboot.
You could also refer to the UEFI source to remove LogoDxe from config file.

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I used the method you provided and got the following prompt in the terminal:
nvidia: building from workspace rooted at: /home/hz/nvidia-uefi
nvidia: found command: python3.
nvidia: found command: virtualenv.
nvidia: found command: mono.
nvidia: found command: aarch64-linux-gnu-gcc.
nvidia: found Python 3.9 or later.
nvidia: Activating Python virtual environment.
nvidia: Updating build environment (edk2-nvidia/Platform/NVIDIA/Jetson/PlatformBuild.py).
edk2-nvidia/Silicon/NVIDIA/scripts/prepare_stuart.sh: 行 41: stuart_update：command not found

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This feels like the discovery and potential exploitation of the LogoFAIL vulnerability discovered by Binarly: Finding LogoFAIL: The Dangers of Image Parsing During System Boot | Binarly – AI -Powered Firmware Supply Chain Security Platform

Is NVIDIA looking to make the logo unmodifiable/protected in a security patch to the UEFI bootloader?

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I have successfully applied the logo to the board, but the size of the logo is too small. Is there any way to change the size of the logo?

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There should be 3 logo images with different resolution.
What do you mean about the “the size of the logo is too small”?
Which resolution is using currently?

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I’ve solved the problem, thank you very much. After restarting, it will display normally.
I manually modified the p3668.conf.common file. The modification content was to change
CMDLINE_ADD=“console=ttyTCU0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0”; to CMDLINE_ADD=“console=ttyTCU0,115200n8 fbcon =map:0 net.ifnames=0”;The purpose is to prevent kernel information from being printed when the system starts. How can I flash only the modified files into the system?

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Since you are modifying the cmdline for kernel, you could also just modify it in /boot/extlinux/extlinux.conf from your board.

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The contents of the /boot/extlinux/extlinux.conf file on the board are as follows:

TIMEOUT 30
DEFAULT primary

MENU TITLE L4T boot options

LABEL primary

  LINUX /boot/Image
  FDT /boot/dtb/kernel_tegra194-p3668-0001-p3509-0000.dtb
  INITRD /boot/initrd
  APPEND ${cbootargs} root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyTCU0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 nv-auto-config

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-p3668-0001-p3509-0000.dtb

INITRD /boot/initrd

APPEND ${cbootargs}

How should I modify this file to ensure that the kernel log information will not be printed when the board starts up? What operations are required after the modification? I also want to ask what the role of TIMEOUT 30 in the first line of this file is.
extlinux.zip (643 Bytes)

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Please just remove console=tty0 in above line.

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I have tried this method. After deleting console=tty0, I tried restarting, but the kernel log information will still be printed.

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I should do the same trick as you did before.

Which UART interface do you want to disable the debug message?
Have you also tried to remove console=ttyTCU0,115200n8?

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Directly add the p3668.conf.common file in JetPack_5.0.2_Linux_JETSON_XAVIER_NX_TARGETS
CMDLINE_ADD=“console=ttyTCU0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0”; change it to CMDLINE_ADD=“console=ttyTCU0,115200n8 fbcon =map:0 net.ifnames=0”; and then refresh the system. I successfully set the kernel information not to be printed, but I tried modifying it directly in the extlinux.conf of the board several times without success.After trying to remove console=ttyTCU0, 115200n8 also failed to remove the kernel information printing.

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Which UART interface do you see the logs output?

You could run cat /proc/cmdline to check if your modification take effects.

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The output I get using cat /proc/cmdline is what the picture below shows:

cat
cat1280×1707 234 KB

From this picture, we can see that directly modifying extlinux.conf does not work. Are there any other modifications that need to be made? ?

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It seems ttyTCU0 and tty0 still exist in kernel cmdline.
Please just modify it in board config and re-flash the board to apply the change.

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