Changing Virtualbox's argument

Hi all,

I am trying out Tinycore Linux in Virtualbox upon NOVA. Here is the virtualbox.run[1] I used. It's almost the original one. And here is the debug output[2] I got from serial port. From the debug output I see fb_drv detects the correct resolution of my monitor, but vbox resized it for some unknown reasons. The graphic output only occupies half of the window. I would like to force vbox to use the resoultion 1920x1440. Could someone give me a example about how to adjust vbox's configuration in virtualbox.run?

[1] https://pastebin.com/GpQ56nX4 [2] https://pastebin.com/uKebQW2n

Best, Naiji