Jetson nano custom boot icon kernel logo CBOOT logo

Jetson Nano The startup icon of is divided into two parts , An icon is located in cboot Inside , Notice that it's not uboot logo; One is in the file system after the kernel starts .

One 、 cboot logo Replace

Jetson Nano Of cboot logo Need a special format of image file ;
 Before production , Need to download NVIDIA BSP Driver package and source package （ In the previous ）;

1、 Enter the tool Directory

cd /Linux_for_Tegra/tools/bmp-splash

2、 edit config

edit config_file.example file , And rename to config_file, What's in it ：
nvidia480.bmp nvidia 480;
nvidia720.bmp nvidia 720;
nvidia1080.bmp nvidia 1080
Change to your own file name , for example
12.bmp nvidia 480;
12.bmp nvidia 720;
12.bmp nvidia 1080
If you want to rewrite it yourself , You need to add a semicolon after each line , Except for the last line .
Will customize the picture （ Must be 24BPP Of BMP picture ） Put it in the current folder ;
Can be in linux Next use file Instruction view file format ;

3、 Generate

Operation instruction ：
OUT=$PWD ./genbmpblob_L4T.sh t210 ./config_file ./BMP_generator_L4T.py /usr/bin/lz4c my-bmp.blob
Note that you need to install a compression kit ：

sudo apt-get install liblz4-tool

4、 Replace

rename my-bmp.blob, Replace the original Linux_for_Tegra/bootloader/bmp.blob file

5、 burn

Burn separately ：
sudo ./flash.sh -r -k BMP
The official tool contains the above tips , But if you use the above command, there will be errors as follows ：

*** Error: missing BMP image. Use option --image to specify the image to be flashed.

therefore , Correct instructions need to be specified image The location of , as follows ：
nano For the ：
sudo ./flash.sh -r -k BMP --image bootloader/bmp.blob jetson-nano-qspi-sd mmcblk0p1

Two 、 Kernel settings

1、 Kernel log output

Jetson Nano The kernel log of will be output from serial port and screen by default , If you want to disable output from the screen, you can set cbootargs To redirect the output stream , Two way ：
①：nano After the start , Enter the board /boot/extlinux/ Catalog , edit extlinux.conf file
LABEL primary
MENU LABEL primary kernel
LINUX /boot/Image
INITRD /boot/initrd
APPEND ${cbootargs} quiet root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0
take console=tty0 Delete .
② The above changes may not work , Then you can try to modify the device tree
stay bsp In the driver package ,
cd /Linux_for_Tegra
Then edit p3448-0000.conf.common file
find

CMDLINE_ADD="console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0";

take console=tty0 Delete , Recompile the device tree or kernel , Burning system ;

2、 Fix the kernel boot blank

After the above steps , You can show your logo Picture. , And the screen is gone log Output , But in boot After getting up, there will be a black blank in the middle of another image when the kernel boots , We need to fill this gap , The kernel configuration needs to be modified
Refer to the kernel clipping in the previous article
take .config In the document
CONFIG_FRAMEBUFFER_CONSOLE=y
Set to n;
Recompile the kernel , And upload the kernel nano Of the board boot Under the table of contents , Cover Image file .

3、 Modify the kernel boot logo

nano When the kernel of is started, it will call the kernel located in /usr/share/backgrouds/ In the catalog png Picture as boot logo
, There are many documents here , Some are black , Transparent icon , If we only modify the displayed part , You can just NVIDIA_Login_Logo.png.png This picture replaces . Restart the machine to see the new icon ;

4、 Disable boot logo

command ：

sudo systemctl set-default multi-user.target