Rockchip CM3 and Pine64 SOQuartz Buildroot System

This repo generates a bootable 64-bit eMMC image for the RK3566 platform. Based on buildroot, this directory is an external buildroot tree - it integrates into the main buildroot tree seamlessly.

Differences from the Original Repo

This repo is forked from Flatmax's RK3566 buildroot system. It is heavily modified to support a newer version of U-Boot and the mainline Linux Kernel 6.1
This enables us to use some fancy new U-Boot features, like compressed kernel images and better handling of U-Boot environments.

• Custom U-Boot v22.04
• Mainline Linux Kernel 6.1

Differences Between the Branches

The branch full_radxa_4_19_kernel uses the stable Radxa 4.19 kernel instead of the upstream 6.1. It also uses the default kernel configs and device trees. All features that work on the original Debian image should also work on that branch.
The branch full_radxa_5_10_kernel uses the dev Radxa 5.10 kernel instead of the upstream 6.1. It also uses the default kernel configs and device trees. All features that work on the original Debian image should also work on that branch.

If you are switching between the branches you have to clean the buildroot directory to make sure all additional patches are applied correctly!

cd buildroot
git reset --hard
rm -f .applied_patches_list

Initial Setup

Clone buildroot and this external tree:

cd yourPath
git clone git://git.busybox.net/buildroot buildroot
git clone https://github.com/Tidone/buildroot.cm3.git buildroot.cm3
cd buildroot && git checkout 2022.08

Install all requirements:

sudo apt install -y build-essential gcc g++ autoconf automake libtool bison flex gettext
sudo apt install -y patch texinfo wget git gawk curl lzma bc quilt expect

The above instructions apply to Debian-based distros. Buildroot works on other distros, but installing the above dependencies is beyond the scope of this README; check your distro's package manager documentation. Additionally a bash shell is required on distros where it is not the default.

Compiling

cd buildroot
source ../buildroot.cm3/setup.cm3.sh .
mkdir ../buildroot.dl
utils/brmake

Installing

Write the image (output/images/sdcard.img) to the eMMC using rkdeveloptool

Using

Connect to the console uart with a serial cable (1500000 Baud, 8n1). Or add the openssh-server pacakge to the buildsystem, then ssh in as user root, no password.

Device Tree Overlays

This repo uses a minimal Linux DTBO, which disables most hardware features.
You can adapt board/RK3566.cm3/linux/rk3566-radxa-cm3-spa.dts to enable/disable anything you need.

SSH RSA Keys

To use ssh, put your id_rsa.pub into the authorized_keys in the overlays directory. This will autoload your public RSA key to the embedded system so that you can login.

$ mkdir -p overlays/root/.ssh; chmod go-rwx overlays/root/.ssh
$ ls -ld overlays/root/.ssh
drwx------ 2 me me 4096 Aug  3  2016 overlays/root/.ssh
$ cat ~/.ssh/id_rsa.pub > overlays/root/.ssh/authorized_keys
$ ls -l overlays/root/.ssh/authorized_keys
-rw-r--r-- 1 me me 748 Feb 24 11:17 overlays/root/.ssh/authorized_keys