Hi @Ahelion!
Thank you for contacting NXP Support!
You have to use the DTB for native HDMI, for LVDS you'll need to change it
fsl-imx8qm-mek-hdmi.dtb -> fsl-imx8qm-mek.dtb, you'll find this file in the FAT partition if you flashed the .wic
To do this you need to do the following:
Step 1: Power on the board and press any key to stop the boot process at U-boot.
Step 2: Type the following command to modify the default DTB
=>setenv fdt_file fsl-imx8qm-mek.dtb
Step 3: Save the environment variable by typing the command below
=> saveenv
Step 4: Boot the Linux Kernel by resetting the board or typing the command below:
=> boot
Please note that based on which DTB file is chosen then correct number of IMX-LVDS-HDMI and IMX-MIPI-
HDMI cards has to be connected for the displays to come up.
From L4.19.35_1.1.0 i.MX_Linux_Release_Notes.pdf:
• fsl-imx8qm-mek.dtb: Supports the LVDS-HDMI or MIPI-DSI-HDMI display with the LVDS-HDMI or MIPI-DSI-HDMI converts. The detection is on-the-fly by using the device-tree overlay technology.
• fsl-imx8qm-mek-hdmi.dtb: Supports native HDMI TX interface on the CPU board.
• fsl-imx8qm-mek-jdi-wuxga-lvds1-panel.dtb: Supports the dual channel LVDS panel, connecting the two mini-SAS ports with the LVDS1 CH0 and LVDS1 CH1.
If you want to use the native HDMI to run a quick test you'll need to connect your HDMI cable to the HDMI TX (J6).
Please check the Linux Release notes:
https://www.nxp.com/docs/en/release-note/IMX_LINUX_RELEASE_NOTES.pdf
Best Regards!
Chavira
