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# Building a small Raspberry Pi System from Scratch
What you are looking at right now is a collection of instructions on how to
bootstrap a tiny system for a Raspberry Pi 3 board.
We will bootstrap the system by building our own cross compiler toolchain
and then using it to cross compile everything we need for a working Linux
based OS.
In contrast to similar guides, I try to explain why we are doing the things
the way we are doing them, instead of just throwing a bunch of copy-paste
command lines around (I'm looking at you, LFS).
This guide is divided into the following parts:
* [Basic Setup](00_setup.md). Lists some tools that you should have
installed and walks through the steps of setting up the directory tree that
we work in, as well as a few handy environment variables.
* [Building a cross compiler toolchain](01_crosscc.md).
* [Cross compiling a statically linked BusyBox and the kernel](02_kernel.md).
The BusyBox is packaged into a small initramfs. We will make it boot on the
Rapsberry Pi and explore some parts of the Linux boot process.
* [Building a more sophisticated userland](userland.md). Mostly a
Linux-From-Scratch-Style "lets build some packages". The userland will be
packed into a SquashFS image. The BusyBox based initrd is modified to mount
it and switch into it.
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