meta-mycustom

Custom Yocto layer for balenaOS builds, with example systemd services, license and custom image extensions.

Layer Contents

This layer provides:

• A hello service recipe (hello_1.0.bb) that inherits several .bbclass files
• Several kernel updates to linux-raspberrypi:
  • Enables USB-to-serial converter chips in my-serial.cfg
  • Enables UART on GPIO14/15 (ttyAMA0) in my-kernel.cfg
  • Patches the ftdi_sio.c USB-to-serial driver in my-driver.* (in-tree)
• A functional network-monitor service recipe in network-monitor_1.0.bb (adapted from RaspAP)
• Shared systemd unit files (hello.service, update-pre.service, [email protected])
• A centralized custom license file
• BitBake class extensions:
  • mycustom-license.bbclass: Declares a local license and checksum
  • mycustom-minwite.bbclass: Configure minimal filesystem write features (optional)
  • mycustom-networkmonitor.bbclass: A lightweight network activity monitor for embedded systems
  • mycustom-ota.bbclass: Enables OTA support with update-pre, post + reboot hooks
  • mycustom-security.bbclass: Injects security best practices
  • mycustom-systemd.bbclass: Installs systemd unit files for recipes
• Image extension via balena-image.bbappend

Layer Structure

├── bblayers.conf
├── classes
│   ├── mycustom-license.bbclass
│   ├── mycustom-minwrite.bbclass
│   ├── mycustom-networkmonitor.bbclass
│   ├── mycustom-ota.bbclass
│   ├── mycustom-security.bbclass
│   └── mycustom-systemd.bbclass
├── conf
│   └── layer.conf
├── files
│   ├── hello.service
│   ├── LICENSE
│   ├── sshd_config_append
│   ├── update-post.service
│   ├── update-post.sh
│   ├── update-pre.service
│   ├── update-reboot.service
│   ├── update-reboot.sh
│   └── var-log.mount
├── README.md
├── recipes-core
│   ├── hello
│   │   └── hello_1.0.bb
│   └── images
│       └── balena-image.bbappend
├── recipes-kernel
│   └── linux
│       ├── linux-raspberrypi_%.bbappend
│       ├── my-driver.cfg
│       ├── my-driver.patch
│       ├── my-kernel.cfg
│       └── my-serial.cfg
└── recipes-utils
    └── network-monitor
        ├── files
        │   ├── [email protected]
        │   └── network-monitor.c
        └── network-monitor_1.0.bb

Usage

Add the layer to bblayers.conf:

BBLAYERS += "${TOPDIR}/../layers/meta-mycustom"

To disable minimal filsystem write mode, set MINWRITE_ENABLED = "0" in conf/layer.conf.

Requirements

• A Yocto Project compatible environment
• balenaOS build system (eg., balena-raspberrypi)
• validated on kirkstone-based BSP

Build configuration

Build Configuration:
BB_VERSION           = "2.0.0"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "universal"
TARGET_SYS           = "aarch64-poky-linux"
MACHINE              = "raspberrypi3-64"
DISTRO               = "balena-os"
DISTRO_VERSION       = "6.5.24"
TUNE_FEATURES        = "aarch64 armv8a crc cortexa53"
TARGET_FPU           = ""
meta-balena-rust     
meta-balena-common   
meta-balena-kirkstone = "HEAD:c5b8f50a26c661b11806e943ffb4c09761e3b186"
meta-balena-raspberrypi = "master:2aa78414828a784d9ef863a5634576e225a1e104"
meta                 
meta-poky            = "HEAD:be48ef3d1bab50824c6678748bcfa897a2a6ca8a"
meta-oe              
meta-filesystems     
meta-networking      
meta-python          
meta-perl            = "HEAD:7b3fdcdfaab2fc964bbf9eec2cce4e03001fa8cf"
meta-raspberrypi     = "HEAD:d7544f35756d87834e8b4bf3e3e733c771d380ae"
meta-mycustom        = "master:44ccfb82ffc782fd874b7991f0c96521d40ccf97"