Boot Logo Customization on NVIDIA® Jetson™ Modules

WHAT YOU WILL LEARN?

1- Generating the bmp.blob file

2- Flashing the bmp.blob file

3- Changing the login logo

ENVIRONMENT

Hardware: DSBOARD-XV

OS: Ubuntu 16.04.1 LTS

Language: C++

DOWNLOADS

FORECR CUSTOM BOOT

In this blog post, we generate the bmp.blob file, flash the bmp.blob file and change the login logo. We used NVIDIA Jetson Xavier (8GB) module on MILBOARD-XV, but you can use all types of Jetson module.

Required files/devices:

• 24 bit BMP images (x3) (640x480, 1280x720, 1920x1080)

• PNG image (1920x1080)

• JetPack installer host PC

• Jetson module with carrier board

Generate bmp.blob File

In our host PC, SDK Manager creates nvidia folder in HOME directory (~). After booting image, SDK Manager saves flashing files. Your blob file generator's path should located in "Linux_for_Tegra/tools/bmp-splash".

Our Xavier (8GB) boards full path is (for JetPack 4.5):

~/nvidia/nvidia_sdk/JetPack_4.5_Linux_JETSON_AGX_XAVIER_8GB/Linux_for_Tegra/tools/bmp-splash

We copied bmp-splash folder into ~/Desktop. (It's up to you.)

(Hint: All details are in bmp-blob-README.txt file)

First of all, add 24 bit BMP images into bmp-splash folder.

Secondly, change config_file.example's name to config_file and change inside like that:

Install liblz4-tool and get its full path.


sudo apt-get install liblz4-tool
whereis -b lz4c

Next, learn Jetson module's chip from this table:

Now, open terminal and generate bmp.blob file with one of these commands:

For Xavier NX or Xavier series:


OUT=$PWD ./genbmpblob_L4T.sh t194 ./config_file ./BMP_generator_L4T.py /usr/bin/lz4c bmp.blob

For Nano or TX1:


OUT=$PWD ./genbmpblob_L4T.sh t210 ./config_file ./BMP_generator_L4T.py /usr/bin/lz4c bmp.blob

For TX2 series:


OUT=$PWD ./genbmpblob_L4T.sh t186 ./config_file ./BMP_generator_L4T.py /usr/bin/lz4c bmp.blob

Flashing the bmp.blob file

Change the default bmp.blob file with your custom file. This file is:

• ~/nvidia/nvidia_sdk/_Linux_/Linux_for_Tegra/bootloader/bmp.blob

Open your module in Recovery Mode. Change current directory and flash BMP file:

• ~/nvidia/nvidia_sdk/_Linux_/Linux_for_Tegra

• sudo ./flash.sh -r -k BMP --image ./bootloader/bmp.blob

A few seconds later...

Changing the login logo

Copy 1080p PNG login logo into module and move into /usr/share/backgrounds. Then, change two xsessionrc files with sed command:


sudo mv FORECR_Login_Logo.png /usr/share/backgrounds/FORECR_Login_Logo.png
sed -i 's/NVIDIA_Login_Logo/FORECR_Login_Logo/g' ~/.xsessionrc
sudo sed -i 's/NVIDIA_Login_Logo/FORECR_Login_Logo/g' /etc/skel/.xsessionrc
cat ~/.xsessionrc | grep logo_path
cat /etc/skel/.xsessionrc | grep logo_path

[Optional] Disable Blinking Text Cursor

Open /boot/extlinux/extlinux.conf file. Remove "console=tty0" and add "vt.global_cursor_default=0"

Thank you for reading our blog post.