STM32mp157 [drm] ltdc fifo underrun: please verify display mode

[Bshen.2]

Can someone do me a favor?I need some help.I'm using the board of the stm32mp157 chip.When I try to restart the board, he occasionally prompts for some errors.

[drm] ltdc fifo underrun: please verify display mode

And at the same time, my hdmi monitor doesn't work.How do I solve this problem?

[PatrickF]

Hi @Bshen.2​ ,

the LTDC fifo underrun could be issued occasionally during display initialization, it is usually not blocking.

for HDMI, please have a look to https://wiki.st.com/stm32mpu/wiki/How_to_display_on_HDMI

Regards,

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[PatrickF]

Hi @Bshen.2​ ,

could you check if you have both DDR_PCFGR_0 and DDR_PCFGR_1 set to 0x00010000 in TF-A DDR setting .dtsi file ?

If not already at those values, could you give a try to see if this improve your issue ?

Regards,

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