I am trying to emulate a board which has a OLED display, but can't see anything. Can you tell me if there is something important I am not considering?

I am just a newbie that is trying to learn. I can't see anything in the OLED display (ssd0303). I am just using this demo: https://www.freertos.org/portlm3s811keil.html as you can see it says that: > The print task is the only task permitted to access the LCD - thus > ensuring mutual exclusion and consistent access to the resource. Other > tasks do not access the LCD directly, but instead send the text they > wish to display to the print task. The print task spends most of its > time blocked - only waking when a message is queued for display. but actually, if I compile using make and running using qemu-system-arm -M lm3s811evb -kernel gcc/RTOSDemo.bin I can only see that black screen. Why? Is there something I am not considering? It should work out of the box, since it's also writen in the official doc that I mentioned. So why I see black screen? Probably there is something I am not considering because I am a newbie