Hey, @ellebi,
Unfortunately, we do not support the U-Boot splash screen for iMX8 based SoMs onward. You can see a discussion here about a similar issue.
We only support displaying a splash screen through Plymouth, on Linux. As an alternative, you can optimize the U-Boot boot time and display the splash screen on Linux itself. If this is a valid alternative for your project, go through the steps in the following articles:
- Torizon OS Boot Time Optimization | Toradex Developer Center
- How to Add a Custom Splash Screen (Linux) | Toradex Developer Center
Let me know if you find any issues following the pages.
Best regards,