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These instructions will take you through the step by step process of building and flashing a custom build of the Coreboot ROM to a Chromebook C201.

This guide expects you to have a Chromebook C201, and another ARM computer with Ubuntu installed. Specifically I used the Odroid XU2. You may be able to do this on an Intel platform, using a cross compiler. See the sidenotes section for more information.

Setting up your Ubuntu

Install dependancies

Update your Ubuntu aptitude and install the dependancies we will need.

sudo apt update

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The following firmware can be uploaded onto an ESP32-C6 to expose a ZigBee device.

At the bottom is the zigbee2mqtt device definition.

Firmware:

#include "esp_zigbee.h"

void setup() {
    // Initialize Zigbee stack configuration for a Zigbee end-device

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/* ==UserStyle==
@name           HackerNews Dark
@namespace      gist.github.com/markwylde/1d25a9c2237dd79cf4d1a1fc2f4e0d45
@author         Mark Wylde
@description    Change the HackerNews style to dark
@version        1
@license        MIT
==/UserStyle== */
@-moz-document domain("news.ycombinator.com") {
    body {

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apt-get update
apt-get upgrade -y
DEBIAN_FRONTEND=noninteractive apt-get install -y x11vnc xvfb fluxbox
Xvfb :2 -screen 0 1024x768x16 &
DISPLAY=:2 fluxbox &
DISPLAY=:2 x11vnc -display :2 -bg -forever -nopw -quiet -listen localhost -xkb &

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# How many swarm workers do you want?
WORKER_COUNT="${WORKER_COUNT:-5}"

# What would you like to prefix all your VM's with?
CLUSTER_NAME="${CLUSTER_NAME:-mycluster}"

# Set this to true to use virtualbox instead of digitalocean driver
LOCAL_VIRTUALBOX="${LOCAL_VIRTUALBOX:-true}"

# Virtualbox Configuration

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version: '3'

services:
  mongo:
    image: mongo
    restart: always
    ports:
      - 27017:27017
    environment:
      MONGO_INITDB_ROOT_USERNAME: root

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function actualStringify (object) {
  const newObject = {};
  for (const key in object) {
    if (['String', 'Object', 'Number'].includes(object[key].constructor.name)) {
      newObject[key] = object[key];
    }
  }
  return JSON.stringify(newObject, null, 2);
}

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// This code should be accessable from your root domain
// As in, don't bundle
const cacheName = 'cache-v1';

// The activate handler takes care of cleaning up old caches.
self.addEventListener('activate', event => {
  const currentCaches = [cacheName];
  event.waitUntil(
    caches.keys().then(cacheNames => {
      return cacheNames.filter(cacheName => !currentCaches.includes(cacheName));

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function checkNotificationPermission (requested) {
  FirebasePlugin.hasPermission(function (hasPermission) {
    if (hasPermission) {
      console.log('Remote notifications permission granted')
      // Granted
      getToken()
    } else if (!requested) {
      // Request permission
      console.log('Requesting remote notifications permission')
      FirebasePlugin.grantPermission(checkNotificationPermission.bind(this, true))

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const fs = require('fs');
const http = require('http');

const handler = require('serve-handler');
const render = require('mithril-node-render');

const htmlTemplate = fs.readFileSync('./index.html', 'utf8');
const ui = require('./js/ui');

const server = http.createServer(async function (request, response) {