Good day, I have a display of 1280 * 480 lq123k1lg03, will be able to tell how to set up KHADAS VIM1 Android for such permission?
Sorry for that, The VIM don’t support for the 1280x480 resolutions output.
Okay, Khadas VIM1 supports external usb video cards?
I don’t think the ARM CPU can support external usb video cards. 
found a way out, I have an android cx-919 screen position, there you can reduce the width, without reducing the height, in your assembly there is no such. Do you (nougat) have a percentage decrease in height and width, can this be corrected somehow?
About how to change HDMI overscan, you can refer to below command.
root@Khadas:~# echo 10 10 1909 1069 > /sys/class/graphics/fb0/window_axis
root@Khadas:~# echo 0x10001 > /sys/class/graphics/fb0/free_scale
Tips: window_axis parameter valued as: left + bottom + right + top
left + right = 1919
bottom + top = 1079
This is for 1080p output.
Does this change in the source code, then compile again?