Embedded Linux Yocto

Embedded Linux and Yocto learning materials

Embedded_Linux&Yocto_topics

Overview

This repository provides a scalable enterprise-grade Embedded Linux platform built using the Yocto Project.

The goal of this platform is to support multiple SoC vendors and hardware boards under a unified architecture with:

Common BSP workflows
CI/CD automation
Reproducible builds
OTA update support
Secure boot integration
Manufacturing flashing workflows
Automated validation
Long-term maintainability

The platform is designed for:

Industrial systems
Robotics
AI edge devices
Automotive gateways
Medical devices
IoT gateways
Multimedia systems
FPGA platforms

Supported Platforms

ARM / ARM64 Boards

Raspberry Pi Family

Supported:

Raspberry Pi 4
Raspberry Pi 5
CM4
CM5

Main Layer:

meta-raspberrypi

Features:

SD/eMMC boot
USB boot
Wayland/Weston
Camera support
GPU acceleration
OTA support

NXP i.MX Boards

Supported:

i.MX6
i.MX7
i.MX8M
i.MX8MP
i.MX93

Main Layer:

meta-freescale

Features:

Secure boot
GPU/VPU acceleration
AI acceleration
Industrial BSP support
eMMC/NAND/NVMe support

Texas Instruments Boards

Supported:

AM62x
AM64x
AM65x
J721E
BeagleBone AI

Main Layer:

meta-ti

Features:

MCU+Linux architecture
IPC support
Industrial Ethernet
Edge AI acceleration
Vision processing

NVIDIA Jetson Boards

Supported:

Jetson Nano
Xavier NX
AGX Xavier
Orin NX
AGX Orin

Main Layer:

meta-tegra

Features:

CUDA
TensorRT
AI acceleration
Multimedia pipelines
GPU compute

Rockchip Boards

Supported:

RK3566
RK3568
RK3588

Main Layers:

meta-rockchip

Features:

Multimedia acceleration
NPU support
HDMI/MIPI pipelines
NVMe support

Xilinx / AMD FPGA Boards

Supported:

ZCU102
KV260
VCK190
ZedBoard

Main Layers:

meta-xilinx

Features:

FPGA bitstream integration
Vitis AI
Hardware accelerators
Secure boot
JTAG workflows

STM32 MPU Boards

Supported:

STM32MP157
STM32MP13

Main Layer:

meta-st-stm32mp

Features:

OP-TEE
Cortex-M co-processor
Industrial control
Low power systems

Qualcomm Boards

Supported:

RB5
RB3 Gen2
DragonBoard

Main Layer:

meta-qcom

Features:

DSP acceleration
AI acceleration
Camera pipelines
Android-style boot flows

RISC-V Boards

Supported:

VisionFive 2
HiFive Unmatched
Milk-V
Banana Pi RISC-V

Main Layers:

meta-riscv
vendor BSP layers

Features:

Open hardware ecosystem
OpenSBI support
Upstream Linux focus

Toradex Platforms

Supported:

Verdin iMX8MP
Verdin AM62
Apalis iMX8
Colibri iMX6

Main Layers:

meta-toradex-bsp-common
meta-toradex-nxp
meta-toradex-ti

Features:

Torizon OS
OTA support
Industrial BSPs
Container workflows

Repository Structure

repo/
├── docs/
├── scripts/
├── ci/
├── kas/
├── build-configs/
├── meta-company-common/
├── meta-company-security/
├── meta-company-connectivity/
├── meta-company-gui/
├── meta-company-ai/
├── meta-company-industrial/
├── meta-company-ota/
├── meta-company-virtualization/
├── meta-company-robotics/
├── vendor/
│   ├── meta-raspberrypi/
│   ├── meta-freescale/
│   ├── meta-ti/
│   ├── meta-tegra/
│   ├── meta-xilinx/
│   ├── meta-qcom/
│   ├── meta-st-stm32mp/
│   ├── meta-rockchip/
│   └── meta-riscv/
└── tools/

Build System Architecture

Core Technologies

Component	Purpose
Yocto Project	Build framework
OpenEmbedded	Metadata ecosystem
BitBake	Task execution
kas	Build orchestration
Docker/Podman	Build containers
GitLab/GitHub Actions	CI/CD
RAUC/Mender	OTA updates
labgrid/LAVA	Hardware testing

Build Environment Setup

Host Requirements

Recommended:

Ubuntu 22.04 LTS
16+ CPU cores
64GB RAM
500GB SSD

Install Dependencies

sudo apt install gawk wget git diffstat unzip texinfo \
gcc build-essential chrpath socat cpio python3 python3-pip \
python3-pexpect xz-utils debianutils iputils-ping \
python3-git python3-jinja2 libsdl1.2-dev xterm \
zstd liblz4-tool

Repository Initialization

Clone Repository

git clone <repo-url>
cd repo

Sync Vendor Layers

./scripts/sync-layers.sh

Initialize Environment

source scripts/setup-env.sh

Using kas

Build Raspberry Pi Image

kas build kas/raspberrypi/rpi5.yml

Build NXP Image

kas build kas/nxp/imx8mp.yml

Build TI Image

kas build kas/ti/am62.yml

Build Jetson Image

kas build kas/nvidia/orin.yml

Image Types

Image	Purpose
core-image-minimal	Minimal Linux
core-image-full-cmdline	CLI systems
core-image-weston	Wayland GUI
multimedia-image	Multimedia systems
ai-image	AI edge systems
industrial-image	Industrial deployments
factory-image	Manufacturing flashing

Flashing Workflows

Supported Flash Methods

Method	Platforms
SD card	Raspberry Pi, RISC-V
eMMC flashing	NXP, TI, Toradex
USB recovery	STM32, Toradex
Fastboot	Qualcomm
SDK Manager	NVIDIA
JTAG	Xilinx
Network boot	All major platforms

Verification Framework

Validation Levels

Boot Validation

Checks:

UART logs
Bootloader
Kernel boot
Device tree
RootFS mount

Peripheral Validation

Checks:

Ethernet
Wi-Fi
Bluetooth
USB
CAN
SPI
I2C
GPIO
UART

Graphics Validation

Checks:

Weston
DRM/KMS
OpenGL ES
Vulkan
HDMI/MIPI display

AI Validation

Checks:

TensorRT
Vitis AI
DSP/NPU acceleration
ONNX Runtime

Security Validation

Checks:

Secure boot
OP-TEE
Signed images
TPM integration
Encrypted storage

OTA Validation

Checks:

A/B updates
Rollback
Image integrity
Partition switching

CI/CD Architecture

Pipeline Flow

Git Push
   ↓
Static Analysis
   ↓
kas Build
   ↓
SPDX/SBOM Generation
   ↓
Artifact Packaging
   ↓
Flash Hardware
   ↓
UART Capture
   ↓
Hardware Validation
   ↓
OTA Validation
   ↓
Release Publish

CI Features

Supported:

Incremental builds
Shared sstate cache
Shared downloads cache
Artifact retention
Parallel hardware testing
Multi-board matrix builds
SBOM generation
CVE scanning

Release Management

Release Types

Release	Purpose
Development	Daily builds
QA	Validation builds
Release Candidate	Pre-production
Production	Stable release
LTS	Long-term support

OTA Architecture

Supported Frameworks:

RAUC
Mender
OSTree
Aktualizr

Features:

A/B partitions
Rollback
Signed bundles
Delta updates
Fleet management

Security Features

Supported Security Components

Feature	Support
Secure Boot	Yes
TPM	Yes
OP-TEE	Yes
dm-verity	Yes
SELinux	Optional
Disk Encryption	Yes
Signed OTA	Yes

Manufacturing Support

Factory Workflow

Factory PC
   ↓
Recovery Mode
   ↓
Flash Device
   ↓
Run Validation
   ↓
Generate Device Certificate
   ↓
Store Manufacturing Logs

Hardware Lab Infrastructure

Recommended Lab Setup

Component	Recommendation
Power control	USB relay/PDU
UART capture	Serial servers
Flash automation	labgrid
Test orchestration	LAVA
Thermal testing	Controlled chamber
Network isolation	VLAN setup

Development Best Practices

DO

Use kas for reproducible builds
Keep vendor layers unmodified
Create custom company layers
Enable UART on all boards
Automate validation
Version lock all layers
Use shared sstate cache
Maintain release manifests

DON'T

Modify vendor BSP directly
Hardcode machine-specific hacks
Skip secure boot validation
Ignore OTA rollback testing
Use SD cards for production systems

Common Development Workflow

Feature Development
        ↓
Local Build
        ↓
Static Validation
        ↓
Hardware Flash
        ↓
Peripheral Tests
        ↓
CI Validation
        ↓
OTA Validation
        ↓
Release Tagging

Future Roadmap

Planned additions:

Yocto Scarthgap LTS support
Full SBOM automation
CVE dashboards
Fleet OTA management
Secure enclave integration
Kubernetes at edge
AI benchmarking framework
Rust embedded support
Zephyr co-processor integration

Recommended Tools

Build Tools

kas
BitBake
repo
Docker
Podman

Validation Tools

labgrid
LAVA
pytest
Robot Framework

Debug Tools

UART adapters
JTAG probes
OpenOCD
Wireshark
perf
trace-cmd

Contribution Guidelines

Requirements

Before submitting:

Run lint checks
Validate on hardware
Provide test logs
Update documentation
Include release notes

Name		Name	Last commit message	Last commit date
Latest commit History 8 Commits
yocto-platform		yocto-platform
DTS_DTB.md		DTS_DTB.md
README.md		README.md
yocto.md		yocto.md

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Embedded Linux Yocto

Embedded Linux and Yocto learning materials

Overview

Supported Platforms

ARM / ARM64 Boards

Raspberry Pi Family

NXP i.MX Boards

Texas Instruments Boards

NVIDIA Jetson Boards

Rockchip Boards

Xilinx / AMD FPGA Boards

STM32 MPU Boards

Qualcomm Boards

RISC-V Boards

Toradex Platforms

Repository Structure

Build System Architecture

Core Technologies

Build Environment Setup

Host Requirements

Install Dependencies

Repository Initialization

Clone Repository

Sync Vendor Layers

Initialize Environment

Using kas

Build Raspberry Pi Image

Build NXP Image

Build TI Image

Build Jetson Image

Image Types

Flashing Workflows

Supported Flash Methods

Verification Framework

Validation Levels

Boot Validation

Peripheral Validation

Graphics Validation

AI Validation

Security Validation

OTA Validation

CI/CD Architecture

Pipeline Flow

CI Features

Release Management

Release Types

OTA Architecture

Security Features

Supported Security Components

Manufacturing Support

Factory Workflow

Hardware Lab Infrastructure

Recommended Lab Setup

Development Best Practices

DO

DON'T

Common Development Workflow

Future Roadmap

Recommended Tools

Build Tools

Validation Tools

Debug Tools

Contribution Guidelines

Requirements

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