HDMI screen when device was booted without HDMI


The Dragonboard 410c only outputs to hdmi display when the display is connected during boot time.
This creates a problem for us, as we have devices that are standalone, with no screens, but sometimes, when there is a problem and we need to debug something, we want to connect with an hdmi display (and keyboard) to check what is the problem, but we can’t.

How can we make it so that the device will output to HDMI even when it was not booted with hdmi?