Issue changing U-Boot Splash

Technical Support
, , ,
1

Using U-Boot 2019.07-3.0.4+g26d926eda0, I got an issue printing a bitmap to use as splash using the U-Boot console:

Colibri iMX7 # mmc rescan
Colibri iMX7 # load mmc 0 ${loadaddr} testlogo.bmp
23878 bytes read in 17 ms (1.3 MiB/s)
Colibri iMX7 # bmp display ${loadaddr}
Error: 32 bit/pixel mode, but BMP has 8 bit/pixel

I’ve tried using both 32bit and 8 bit images. In neither case I could produce an image on the screen.

2

Furthermore, after running

run ubiboot

the linux application runs at 16 bit depth (as planned) but the screen is running at 32 bit depth.

It seems as bmp display ${loadaddr} is changing the vidargs from 16@60 to 32@60.

3

Hi @Ilan_Figueiredo,

Have you followed the steps presented on Splash Screen on U-Boot?

You have to change the image to 8bit depth format:

convert testlogo.png -type Palette -colors 224 -depth 8 -compress none -verbose BMP3:testlogo.bmp

And if you are testing on one of our newest BSP 5 images, you have to enable CONFIG_DM_VIDEO=y on U-Boot defconfig for Colibri iMX7, otherwise, there will be no video output on U-Boot.

Best regards,
André Curvello

4

I followed the article and tried to convert a new image, and I’m still having issues.

This time I got the following:

Colibri iMX7 # mmc dev 0
switch to partitions #0, OK
mmc0 is current device
Colibri iMX7 # mmc rescan
Colibri iMX7 # load mmc 0 ${loadaddr} logo-uboot.bmp
Colibri iMX7 # bmp display ${loadaddr}
There is no valid bmp file at the given address

I’ve tried using a 500x350 pixels image. I wil test with a smaller one, but is the image size an issue?

I am using a modified BSP3.0.4 .

5

Loading off of eMMC should use the “fatload” command, and specify the device and partion:

“fatload mmc 0:1 ${loadaddr} logo.bmp”

If fatload doesn’t say bytes loaded, then it didn’t load anything.

I did my own uboot splash, but I replaced the image in the u-boot source (check tools/logos/toradex.bmp). You’ll also need to wire up any GPIO signals to get your LCD to light up and start showing data.

6

Hi @lkoziarz and @Ilan_Figueiredo,

I would recommend adding the U-Boot logo in the sources.

I did it here and it’s working.

About the backlight, that’s only valid if your backlight is inverted, otherwise, it’s expected to work normally.

Best regards,
André Curvello

7

Is the bmp command only supported in some versions of U-boot? I am using U-Boot 2020.04-0+git.6a8d4f758d03 (Aug 20 2021 - 10:22:00 +0000) on Colibri-imx8x, and I get an unknown command message when trying to execute the bmp command. Also, is there a way to enable U-boot video output without rebuilding U-boot from source?

8

I ended up adding the image to the Linux source when bitbaking a new image. This way there is no need to rebuild the U-Boot.

1 Like
9

Hi @rubi0030

No this is not possible, you would have to rebuild U-boot.

Best Regards
Kevin

10

Hi @rubi0030 have you been able to make it work for you? Maybe you could create another thread if you’re still facing this issue.