BMP Splash Screen not showing using custom resolution

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

For our developed device we are showing a custom Splash Screen using the BMP method described in Linux4Tegra/Tools/bmp-splash.
This was working fine, but now we are updating our display from 1920x1080 to a 1200x1920 display, which we are using horizontally.
That is why I am now trying to create a 1200x1920 bmp.blob (in which my logo is rotated).
Here is my configuration:
This is my .bmp
HAIPLogo1920x1200-rotated.zip (39.4 KB)

My config file has only 1 line without a semicolon since I only have one resolution:
./HAIPLogo1920x1200-rotated.bmp nvidia 1920

Since the number in the end is the height of the display and mine is 1200x1920 this seems correct.

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

BMP IMAGE INFO   : ././HAIPLogo1920x1200-rotated.bmp nvidia 1920 
1+0 records in
1+0 records out
1 byte copied, 2,2062e-05 s, 45,3 kB/s
1+0 records in
1+0 records out
1 byte copied, 1,8901e-05 s, 52,9 kB/s
1+0 records in
1+0 records out
1 byte copied, 1,9094e-05 s, 52,4 kB/s
1+0 records in
1+0 records out
1 byte copied, 1,7949e-05 s, 55,7 kB/s

Renaming my-bmp.blob to bmp.blob and putting it into bootloader directory.

Flashing using this command:
sudo ./flash.sh -r -k BMP --image bootloader/bmp.blob jetson-nano-emmc mmcblk0p1

My display stays just black. Is 1200x1920 still supported?

I am using Jetson NANO production module on Jetpack version 4.5.
My resulted blob size is 55,1kb.

3

Hi,

we only support these three types of resolutions:

nvidia480.bmp nvidia 480;
nvidia720.bmp nvidia 720;
nvidia1080.bmp nvidia 1080

So you may still be able to generate the blob file, but the bootloader does not support showing it.

4

Okay, I expected that, but was not sure.

Is it possible to force an EDID on the bootloader? So we could try to force a lower resolution?
I remember when forcing EDID in kernel the bootloader was not affected.

Best regards!

5

Hi,

forcing EDID can be done in either device tree or kernel drivers, so in your case please try forcing it in the device tree:

6

But I only want this for bootloader splash screen. When the jetson continous normal operation the edid from the monitor should be taken.
Will this work?

7

Hi,

I just checked and seems like even if you force EDID in the device tree, it won’t be picked up by CBoot so you just cannot do it.

8

Alright, thank you for checking anyway!
Just out of curiosity:
Is it possible in later versions since newer Jetpack uses UEFI Boot?

Best regards,
Johannes

9

I think maybe YES, but you have to use Xavier/Orin with JetPack 5 for UEFI boot, which is not supported on Nano.

10

Yes, I knew. I was just thinking about future releases.
Thanks so far. I’ll mark as solved.

11

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