To activate the splash screen during U-BOOT, I recommand that you start by displaying the splash screen manuallly from the uboot prompt: -First, check that the CONFIG_DM_VIDEO is enabled -Place your bmp image in your boot patition -Using the U-boot c...

Hello @MFR ,The uboot splash screen is enabled by default when you generate image by yocto. if your  question is about the customization of the splash screen, you need to update the recipe meta-st-stm32mp/recipes-bsp/u-boot/u-boot-stm32mp-splash_2018...