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From: Lyndon Nerenberg <lyndon@orthanc.ca>
To: Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Forcing display size on Pi4
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Date: Tue, 17 Dec 2019 13:05:33 -0800
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I have a 2K display that Plan9 forces to 1920x1080 resolution.
Poking around 9/bcm/screen.c indicates that setting vgasize=WxHxD
should force the size, but adding a suitable entry in cmdline.txt
just gives me a blank display.

Before I dig deeper, is this expected to work?  If it is I'll start
adding some kernel prints and try to find out what's not working.

--lyndon