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Windows
Senior
August 6, 2026
Solved

How to start HDMI from U-boot in STM32MP2

Is it possible to start the HDMI from U-boot in STM32MP2?

I want to see the start up log.

Erwan SZYMANSKI
Erwan SZYMANSKIBest answer
ST Technical Moderator
August 11, 2026

Hi @Windows,
I think this is not an issue of DSI / LTDC because they are already supported properly in U-Boot (this is the reason why splash screen on DSI works).

This is the DSI to HDMI bridge driver that need a driver support in U-Boot. For example, on STM32MP257F-DK board, we embed the ADV7533 bridge, and you can see the driver sources in Linux source code (adv7533.c). However, the bridge driver is not present in U-Boot, we only use the compatible to make a simple detection, but I think we do not configure the internal register of the bridge.

Kind regards,
Erwan.

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9 replies

Erwan SZYMANSKI
Erwan SZYMANSKI
ST Technical Moderator
August 7, 2026

Hello ​@Windows,
What do you mean by “I want to see the startup logs” ? You mean you want to display startup logs on your HDMI connected screen ? 

Kind regards,
Erwan.

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WindowsAuthor
Senior
August 7, 2026

​@Erwan SZYMANSKI 

 

Yes! Like a splash screen and the Linux console boot up. Like regular Linux. You know ?

Erwan SZYMANSKI
Erwan SZYMANSKI
ST Technical Moderator
August 10, 2026

Hello ​@Windows ,
As mentioned in this article: How to display on HDMI - stm32mpu, U-Boot does not support HDMI display, but only DSI or LVDS one. This is the reason why you do not see the splash at U-Boot state; drivers are not here to support.

Kind regards,
Erwan.

 

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    WindowsAuthor
    Senior
    August 11, 2026

    Hi ​@Erwan SZYMANSKI 

    By the way. U-boot for NXP supports ADV7535 driver in U-boot:

     

    https://github.com/nxp-imx/uboot-imx/blob/lf_v2026.04/drivers%2Fvideo%2Fadv7535.c

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