External buildroot tree for LuminaSensum MynaPlayer

board/ myna-player-odyssey board/MynaPlayer odyssey: use the version stamp file instead of directly calling git describe in post-image. 8 months ago
buildroot-patches buildroot-patches: Add patches needed for Buildroot 1 year ago
configs board/MynaPlayer odyssey: bump barebox version to 2020.12.0. 10 months ago
packages packages/disabled-services: added rauc-mark-good.service. 1 year ago
scripts global: add structure for version stamping. 8 months ago
utilities global: added a generic barebox config for stm32mp. 8 months ago
.gitignore global: add structure for version stamping. 8 months ago
Config.in Initial commit. 1 year ago
LICENSE Added LICENSE file. This work is entirely under the GPL 3.0 or later, except where otherwise noted (third party code). 1 year ago
README.md board/MynaPlayer odyssey: changed the way the file name and metadata of the images are constructed. 1 year ago
changelog.md Release 2020-09-22 1 year ago
external.desc Initial commit. 1 year ago
external.mk global: add structure for version stamping. 8 months ago
README.md

This is the external Buildroot repository used to build system images and updates for the MynaPlayer project.

Changelog

A changelog is available so that users and developers can quickly check what changed between releases.

Building

Building MynaPlayer is an easy process, though it requires decent hardware.

First install Buildroot's required dependencies. See: The buildroot user manual, chapter 2: System requirements

Then set up the required source code:

mkdir MYNA && cd MYNA
wget 'https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.7/EasyRSA-3.0.7.tgz'
wget 'https://git.buildroot.net/buildroot/snapshot/buildroot-2020.05.1.tar.gz'
tar -xf EasyRSA-3.0.7.tgz
tar -xf buildroot-2020.05.1.tar.gz
mv EasyRSA-3.0.7 easy-rsa
mv buildroot-2020.05.1 buildroot
git clone 'https://git.lumina-sensum.com/git/LuminaSensum/buildroot-MynaPlayer.git'
export BR2_EXTERNAL="$PWD/buildroot-MynaPlayer"
cd buildroot
for p in ../buildroot-MynaPlayer/buildroot-patches/*.patch; do patch -p1 < $p; done
cd ..

Create keys for RAUC updates:

cd easy-rsa
sed -i "s/extendedKeyUsage/#extendedKeyUsage/g" easyrsa3/x509-types/code-signing
./easyrsa3/easyrsa init-pki
./easyrsa3/easyrsa build-ca
./easyrsa3/easyrsa gen-req rauc
./easyrsa3/easyrsa sign-req code-signing rauc
cd ..
cat >buildroot-MynaPlayer/scripts/certs.sh <<EOF
#!/bin/sh
RAUC_CERTIFICATE_AUTHORITY="$PWD/easy-rsa/pki/ca.crt"
RAUC_PRIVATE_KEY="$PWD/easy-rsa/pki/private/rauc.key"
RAUC_PUBLIC_KEY="$PWD/easy-rsa/pki/issued/rauc.crt"
EOF

Build the image:

cd buildroot
make O=output_build myna_player_odyssey_defconfig
make O=output_build -j8
cd ..

Installing via dd

For the initial install of Buildroot you'll need to write a full system image to your board's storage.

To flash to eMMC, first boot Linux from an SD card on the board. See Seeed's ODYSSEY STM32MP157C Wiki page for instructions on how to do this.

First, copy the image to the board from your build server. In this case I'll use SFTP over SSH:

sftp build-server:/home/jookia/MYNA/buildroot/output_build/images/MynaPlayer.img .

Now write it to the eMMC:

dd if=MynaPlayer.img of=/dev/mmcblk0

Switch to eMMC boot and reboot.

You can use this method to install updates, but it's much slower compared to RAUC.

Updating via RAUC

To update using RAUC you'll need a server to host the files.

In this example I'll be using a web server (www.jookia.org) which serves contents from /var/www/www.jookia.org/.

First, copy RAUC bundles and keys to your server:

ls buildroot/output_build/images/
# Find the file ending in *.raucb
# You can also just flash MynaPlayer.img using dd but it takes a long time
mv buildroot/output_build/images/bundle-MynaPlayer.2020-09-06.raucb /var/www/www.jookia.org/
cp $PWD/easy-rsa/pki/ca.crt /var/www/www.jookia.org/
chmod a+r /var/www/www.jookia.org/ca.crt

Install the update on the device from the server:

wget 'https://www.jookia.org/ca.crt'
cp /etc/rauc/keyring.pem{,.bak}
mv ca.crt /etc/rauc/keyring.pem
rauc install https://www.jookia.org/bundle-MynaPlayer.2020-09-06.raucb
mv /etc/rauc/keyring.pem{.bak,}
reboot
  • Notes:
    • The bundle file name is derived from git describe, and might differ slightly if you use a branch with committed but not yet released work. E.g: bundle-MynaPlayer.2020-09-06-18-g3d0589f.raucb.
    • If you have uncommitted work present in your branch, then the file name will have a 'dirty' tag added.
    • If your git index and cache become corrupted for any reason, your bundle will have a 'broken' tag added. This doesn't indicate by any means that your image is broken!

Future updates won't need to copy the keyring, a single 'rauc install' invocation should download and install the image without trouble.

You should now be running a system you've just built (check the kernel build date):

uname -a
# Linux MynaPlayer 5.8.0 #3 SMP PREEMPT Thu Aug 6 03:21:30 EDT 2020 armv7l GNU/Linux