I was working on a bare-metal driver for an SH1106 OLED display when I ran into a funny little problem: once the screen turns on, what do you actually draw with it? Text is one thing. You shove bytes into the display buffer, line up a tiny bitmap font, and boom, you have letters. But the moment you want a graphics library — circles, lines, filled shapes, all the fun stuff — the screen suddenly gets very opinionated. ...
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NOTE: This is not a tutorial. Just stuff I understood from watching videos and reading forums/articles. What is Buildroot? I’d been curious for a while about why certain Linux-based gadgets feel so snappy — fast boot times, no bloat, just doing exactly what they’re supposed to do. I started reading about it and kept running into the name Buildroot. Buildroot is a build system that compiles a complete Linux image from scratch, tailored exactly to your target hardware, with nothing on it that you didn’t explicitly ask for. That minimal footprint is precisely why these devices boot so fast. ...
Let’s actually build the thing ...
Everything your OS hides from you, laid bare ...