# Brain i.MX28 NixOS setup

This repo reconstructs a NixOS build environment for SHARP Brain
(i.MX28 / armv5). It includes local clones of the upstream Brain
projects and a Nix-based build configuration.

## Contents
- `sources/` clones:
  - `buildbrain` (u-boot-brain, brainlilo, image scripts)
  - `linux-brain` (kernel)
  - `sheevaplug-nix` (reference for armv5 NixOS)
- `docs/brain-bootflow.md` - boot chain + SD layout notes
- `docs/nixos-build.md` - build steps
- `nix/` - NixOS config and build expressions
- `patches/` - u-boot extlinux patch
- `bootfiles/` - files copied to the SD FAT partition (BrainLILO, u-boot)

## Quick start
1. Read `docs/brain-bootflow.md`.
2. Follow `docs/nixos-build.md` to build U-Boot and the SD image.