Vesafb.txt : “kernel source Documentation”

What is vesafb?

This is a generic driver for a graphic framebuffer on intel boxes.

The idea is simple: Turn on graphics mode at boot time with the help
of the BIOS, and use this as framebuffer device /dev/fb0, like the m68k
(and other) ports do.

This means we decide at boot time whenever we want to run in text or
graphics mode. Switching mode later on (in protected mode) is
impossible; BIOS calls work in real mode only. VESA BIOS Extensions
Version 2.0 are required, because we need a linear frame buffer.

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