Configure the HDMI output Resolution

For the Ubuntu running in SD card, if you want to change the HDMI output, it will use the debug serial port, so you should do the step(Enter System Command Line via Debug serial).

1. Open the Serial terminal emulator(see more)

2. Boot the board from the SD card, and press space key on PC, then you will enter the U-Boot command line mode.

3. run the follow command to configure the boot param:

# set bootargs root=/dev/mmcblk0p2 rootfstype=ext4 console=ttySAC0,115200n8 lcd=S70 skipcali=y ctp=2 video=HDMI-A-1:1280x720M@60
# saveenv

The video=HDMI-A-1:1280x720M@60 means the HDMI resolution, if you want to change it to 1920x1080, write it as video=HDMI-A-1:1920x1080@60.

Reboot the NanoPC, then the HDMI resolution will be changed.

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