If anyone is interested, I have built a custom Android OS that supports landscape display on the 7" eDP display with the Nano PC T4.
The source is hosted on GITLAB and if you follow the instructions in the Wiki to build Android, you can swap the download link with mine to get the updated code.
Please note that it has custom graphics for the boot logo etc so you will likely have to replace a few things if you want to change these.
The landscape support for the touch is hard coded as I have not found a fix for auto detection of the rotation so any attempt to use portrait with this build will not rotate the touch. I will find the fix for this and post it at some point. For my project I always run in landscape so this is not an issue for me.
https://gitlab.com/davemclaughlin/rk3399-android-8.1
The source is hosted on GITLAB and if you follow the instructions in the Wiki to build Android, you can swap the download link with mine to get the updated code.
Please note that it has custom graphics for the boot logo etc so you will likely have to replace a few things if you want to change these.
The landscape support for the touch is hard coded as I have not found a fix for auto detection of the rotation so any attempt to use portrait with this build will not rotate the touch. I will find the fix for this and post it at some point. For my project I always run in landscape so this is not an issue for me.
https://gitlab.com/davemclaughlin/rk3399-android-8.1