10
VIA SOM-9X50-STK Yocto 3.1 EVK Quick Start Guide
Use the fastboot.exe to set the display device by using the following commands:
D:\platform-tools>fastboot.exe oem display dsi
D:\platform-tools>fastboot.exe oem display hdmi
Use the following command to check the current display device. In the example below, the current display
device is the LCD panel output.
D:\platform-tools>fastboot.exe getvar all
(bootloader) display: dsi
(bootloader) is-userspace: no
(bootloader) max-download-size: 0x4000000
(bootloader) version: 0.5
all: Done!!
Finished. Total time: 0.009s
Power off the VIA SOM-9X50-STK and set the two OS image jumpers (J7 and J5) back to the normal mode setting.
OS image jumpers diagram
Unplug the Micro USB cable, and then power on the VIA SOM-9X50-STK.
When the boot process has completed, the LCD panel output will be set as the display device
Note:
The default display device is HDMI output. After changing the display device, you must restart the VIA SOM-9X50-
STK.
To control the LCD backlight, use the following commands:
root@aiv8385-linux:~# cd /sys/devices/platform/backlight_lcd0/backlight/backlight_lcd0/
root@aiv8385-linux:~# cat max_brightness
16
root@aiv8385-linux:~# echo 16 > brightness
Note:
There are only 17 levels (0~16) for the LCD backlight control.
3.6
Video Playback
The VIA SOM-9X50-STK supports H.265 and H.264 video decoding up to 1080p@30fps/40Mbps.
To playback video, use the following command:
root@aiv8385-linux:~# gst-launch-1.0 playbin flags=0x42 audio-sink="alsasink device=hw:0,28"
video-sink="mtkmdp width=1280 height=640 ! video/x-raw,format=I420 ! mtkwaylandsink"
uri="file:///mnt/test.mp4"
