I am trying to make HDMI & OLED up together on imx8mqevk. Using linux kernel 4.19.35 with Yocto project. I have tried different combinations but only one screen comes up(either HDMI or OLED). I have added sources of fsl-imx8mq-evk-dcss-rm67191.dts into fsl-imx8mq-evk.dts, but only OLED display enabled. Is there any dtb file to make both screen up?