STM32MP157F-EV1 and RaspberryPi 7Inch LCD connect

[JKim.47]

​STM32F157F-EV1 board and RaspberryPi 7-inch LCD were connected using B-LCDAD-RPI1.

However, the LCD does not output.

The image is in use by building Yocto st-image-weston and flashing it to the SD card.

How do I operate the Raspberry Pi LCD?