Intro to Yocto I wish I was given | Part 1: The Basics

README.md

The files we need to build a basic root filesystem with Yocto. These are the support files for a YouTube video

firmware.yaml

header:
  version: 11

machine: gateway-dk
distro: recovery

repos:
  bitbake:
    url: https://git.openembedded.org/bitbake
    branch: "2.12"
    path: sources/bitbake
    layers:
      .: "disabled"

  openembedded-core:
    url: https://git.openembedded.org/openembedded-core
    branch: walnascar
    path: sources/openembedded-core
    layers:
      meta:

  meta-mono:
    path: .

gateway-dk.conf

#@TYPE: Machine
#@NAME: Gateway Development Kit
#@DESCRIPTION: Machine configuration for Gateway Development kit, based on NXP LS1046A

require conf/machine/include/arm/armv8a/tune-cortexa72.inc

# QorIQ-specific variables
MACHINE_SOCARCH = "cortexa72"
SOC_FAMILY = "qoriq:ls1046a"

MACHINE_FEATURES = "serial"

KERNEL_IMAGETYPE = "Image"
KERNEL_DEVICETREE = ""

SERIAL_CONSOLES = "115200;ttyS0"

PREFERRED_PROVIDER_virtual/kernel ?= "linux-dummy"

IMAGE_FSTYPES = "cpio.gz"

layer.conf

BBPATH .= ":${LAYERDIR}"

BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
            ${LAYERDIR}/recipes-*/*/*.bbappend"

BBFILE_COLLECTIONS += "meta-mono"
BBFILE_PATTERN_meta-mono = "^${LAYERDIR}/"
BBFILE_PRIORITY_meta-mono = "10"

LAYERDEPENDS_meta-mono = "core"
LAYERSERIES_COMPAT_meta-mono = "walnascar"

recovery.conf

DISTRO = "recovery"
DISTRO_NAME = "Mono Recovery Linux"
DISTRO_VERSION = "1.0"
MAINTAINER = "Tomaz Zaman <[email protected]>"

# C library we want to use
TCLIBC = "glibc"

# Minimal features - no systemd, no GUI
DISTRO_FEATURES = ""

# Use BusyBox init instead of systemd
VIRTUAL-RUNTIME_init_manager = "busybox"
VIRTUAL-RUNTIME_initscripts = "initscripts"

# Use BusyBox for basic utilities
VIRTUAL-RUNTIME_base-utils = "busybox"
VIRTUAL-RUNTIME_login_manager = "busybox"

# Quality assurance checks
ERROR_QA:append = " textrel host-user-contaminated"
WARN_QA:append = " buildpaths ldflags"

site.conf

# Build optimization, change these according to your number of cpus available.
# Run `$ nproc` to see how many you can allocate to Yocto/bitbake.
PARALLEL_MAKE = "-j 24"
BB_NUMBER_THREADS = "24"

# Shared cache locations. For reusability purposes, it's much better to have all
# the downloaded sources and state caches outside of the project directory.
# Make sure to set correct permissions on these directories.
DL_DIR = "/opt/yocto/yocto-dl"
SSTATE_DIR = "/opt/yocto/yocto-sstate"

# SDK settings
SDKMACHINE = "x86_64"