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If you just want to display some pixels on a screen, using a 'dumb framebuffer' (just an area of memory to store the frame to be displayed) is not very difficult and a FPGA likely doesn't even need an external device - it can output something 'close enough' to VGA. DVI(-in-HDMI) is also possible with minimal external support. Operating system like Linux or NetBSD have support for 'dumb framebuffer'. SoC generator Litex has built-in support as well to generate a framebuffer and the appropriate device tree to declare it to Linux.
In the middle you can try and design your own device and add support to whichever piece of software you need. It's an interesting exercise... (am here, doing that ;-) ).
In the middle you can try and design your own device and add support to whichever piece of software you need. It's an interesting exercise... (am here, doing that ;-) ).