Display Output

Each CPU supports a different set of display options. The table below shows what is supported and which display is the default.

Board	Parallel RGB	LVDS0	LVDS1	HDMI	MIPI DSI
RZ/G3E SOM	Yes	Yes	Yes	Yes*	Yes

*) Via MIPI-DSI to HDMI bridge either on the SOM Carrier Board or on an expansion board

The RZ/G3E supports up to 2 displays at the same time.

HDMI

An HDMI display can be connected in two different ways:

Using the onboard MIPI-DSI to HDMI bridge and a micro-HDMI cable inserted in connector J22. Make sure S1-6 is in position ON.
Using an external MIPI-DSI to HDMI adapter with its FPC cable inserted in connector J21. Make sure S1-6 is in position OFF.

Both alternatives use either rzg3e-ea-som-hdmi.dtb (for ox01f10 camera) or rzg3e-ea-som-hdmi-ov5640.dtb (for ov5640 camera).

LVDS

LVDS can be set up as one of

only LVDS0 (single, for pixel clocks 25-87 MHz), use rzg3e-ea-som-lvds0.dtb. The device tree file is setup for the Riverdi RVT121HVLFWCA0-B with a resolution of 1280x800 @60Hz and using a USB touch controller.
only LVDS1 (single, for pixel clocks 25-87 MHz), use rzg3e-ea-som-lvds1.dtb. The device tree file is setup for the Riverdi RVT121HVLFWCA0-B with a resolution of 1280x800 @60Hz and using a USB touch controller.
both interfaces (dual, for pixel clocks 50-174 MHz) for resolutions up to 1920x1080. Use rzg3e-ea-som-lvds01.dtb which is setup for a generic LVDS display with a resolution of 1920x1080 @60Hz.

Parallel RGB

Use rzg3e-ea-som-lcd.dtb. The device tree file is setup for the Newhaven nhd_5.0_800480tf-atxl display which has a resolution of 800x480. The display uses the fs5x06 capacitive touch screen driver and it is configured in the device tree.

Two Display interfaces at the same time

The RZ/G3E supports up to 2 displays at the same time. There are no prepared device tree files for this, however you can create one quite easily. This examples is for using both LVDS0 and HDMI at the same time.

Start by reading through the instructions in How do I create my own device tree file to get familiar with the overall process
Make a copy of the lvds0 device tree file and give it the new name rzg3e-ea-som-lvds0-hdmi.dts

cp arch/arm64/boot/dts/renesas/rzg3e-ea-som-lvds0{,-hdmi}.dts

Open the new file in an editor and change the include statements to include rzg3e-ea-som-hdmi.dts instead of rzg3e-ea-som.dtsi. So from

/dts-v1/;
#include "rzg3e-ea-som.dtsi"

/dts-v1/;
#include "rzg3e-ea-som-hdmi.dts"

Note that the file extension changes from .dtsi to .dts

You now have a device tree file that supports both LVDS0 and HDMI. The steps are the same to create a file with HDMI+LCD or LVDS0+LCD.
Follow the instructions in How do I create my own device tree file to put your new file to use

U-Boot

The U-Boot is not configured for display output but it is used to select which dtb (device tree) file to use. Pick which dtb file to use from the sections above and then follow the instructions in How do select which device tree file to use.

Linux

The ea-image-base and core-image-base described in Available Images both use Weston which is a simple, minimal reference implementation of the Wayland protocol. Any configured display will be showing the Weston desktop when fully booted into Linux. It has a desktop background, shows the date+time and has a button in the upper left corner to create a terminal.

The desktop can be configured in /etc/xdg/weston/weston.ini but that is a big topic and not described here.

To see some information about the configured displays (in this example we will asume that both the lvds0 and HDMI displays are used as described above).

ls -1 /sys/class/drm/

card0
card0-HDMI-A-1
card0-LVDS-1
version

For more information about the LVDS0 display:

ls -1 /sys/class/drm/card0-LVDS-1/

device
dpms
edid
enabled
modes
power
status
subsystem
uevent

cat /sys/class/drm/card0-LVDS-1/status

connected

cat /sys/class/drm/card0-LVDS-1/modes

1280x800

The controls are similar for the HDMI display but the modes file shows all the modes that the HDMI display support.

ls -1 /sys/class/drm/card0-HDMI-A-1/

device
dpms
edid
enabled
modes
power
status
subsystem
uevent

cat /sys/class/drm/card0-HDMI-A-1/status

connected

cat /sys/class/drm/card0-HDMI-A-1/modes

HDMI​

LVDS​

Parallel RGB​

Two Display interfaces at the same time​

U-Boot​

Linux​