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

Building

Building MynaPlayer is a 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
git clone -b v3.0.7 'https://github.com/OpenVPN/easy-rsa'
git clone -b 2020.05.x 'https://git.buildroot.net/buildroot'
git clone 'https://git.lumina-sensum.com/git/LuminaSensum/buildroot-MynaPlayer.git'
export BR2_EXTERNAL="$PWD/buildroot-MynaPlayer"
cd buildroot
git am ../buildroot-MynaPlayer/buildroot-patches/*.patch
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 ..

Updating via rauc

To install using rauc you'll need a server to host the files. In this example I'll be using a HTTP 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-2020-08-06.fe2ca3ce-be36-4f33-94d4-e295cd0518be.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-2020-08-06.fe2ca3ce-be36-4f33-94d4-e295cd0518be.raucb
mv /etc/rauc/keyring.pem{.bak,}
reboot

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