Hi @Sharan
the stm32mp157d-dk1 is not provided with any DSI display, only HDMI screen is possible.
You could connect a display on DSI connector CN4, but you need to found a compatible display (pinout is somewhat compatible with RPi3 for pin 1 to 15, so need to put the flat cable carefully shifted). Then need to adapt the SW with the used display. Using a different display might mean some feature like backlight or touch screen might work differently and need additional SW and HW adaptations.
Maybe more straightforward to use the stm32mp157f-dk2 which come with a DSI display fully supported in the board Starter Package SW.
Regards.
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