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Yocto can appear incredibly simple.

Until something somewhere deep inside the build process breaks, or you need to enable a peripheral the default device-tree for your board doesn't enable, or a gnat farts on the other side of the world, and it completely stops working.

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The more your hardware vendors work upstream, the more Yocto will simplify your life.

If you buy hardware from a vendor who hands you a "meta-bigco" layer with their own fork of u-boot and the kernel, you're gonna have a bad time...

I spent at least a week to understand Yocto, started reading a book. I couldn't wrap my head around it. Just went back to the RPI OS image builder scripts.

Which book was that? The bootlin course slides are pretty good

Take a look at buildroot its a much better system.

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