Add initial balenafin support

Signed-off-by: Andrei Gherzan <andrei@balena.io>

README.md

@@ -1,7 +1,23 @@
 # pi-gen
 
-_Tool used to create the raspberrypi.org Raspbian images_
+_Tool used to create the balenafin Raspbian images_
 
+![balenaFin](https://raw.githubusercontent.com/balena-os/pi-gen/balenafin-master/balenafin-raspbian.png "balenaFin")
+
+This repository is a fork of [pi-gen](https://github.com/RPi-Distro/pi-gen) which is used to generate _raspberrypi.org_ `Raspbian` image. This fork adds support for [balenaFin](https://www.balena.io/fin/) board by hooking into the build process and injecting and configuring the required components.
+
+All these mentioned changes are implemented as a step in stage 1 (see below for more info) for more info): `04-balenafin`.
+
+## TL;DR
+
+The recommended way to build is using a docker container. This has the advantage that we can minimise the host dependencies. Before doing this make sure the host has `binfmt-support` correctly configured so an ARM container can run on a X86 host.
+
+```bash
+echo "IMG_NAME=Raspbian" > config
+./build-docker.sh
+```
+
+On a successful build the artefacts will be available in the `deploy` subdirectory copied from the docker container.
 
 ## Dependencies
 

stage1/04-balenafin/00-packages

@@ -0,0 +1 @@
+apt-transport-https

stage1/04-balenafin/00-run.sh

@@ -0,0 +1,8 @@
+#!/bin/bash -e
+
+install -m 644 files/balenafin.list "${ROOTFS_DIR}/etc/apt/sources.list.d/"
+
+on_chroot apt-key add - < files/bintray-public.key.asc
+on_chroot << EOF
+apt-get update
+EOF

stage1/04-balenafin/01-packages

@@ -0,0 +1,3 @@
+balenafin-firmware
+raspberrypi-kernel-headers
+sd8887-mrvl

stage1/04-balenafin/files/balenafin.list

@@ -0,0 +1 @@
+deb https://dl.bintray.com/balenaos/raspbian stretch main

stage1/04-balenafin/files/bintray-public.key.asc

@@ -0,0 +1,52 @@
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