Mark OS – Embedded Linux Learning Platform (Yocto + Custom Layers) Mark OS is a structured learning project focused on understanding, customizing, and building embedded Linux systems using the Yocto Project. This repository captures my learning journey, including configuration files, custom layers, build experiments, and documentation as I work toward full-stack embedded Linux and kernel development.

Project Goals (Learning Phase) Develop a solid foundation in Yocto workflows Understand layer structure, recipes, and image customization Practice managing build configurations (local.conf, multiconfig, overrides) Create and maintain a custom layer (meta-root_v1) Build minimal and custom root filesystems for real hardware targets Document the full end-to-end build pipeline Prepare groundwork for later phases (kernel development, security modules, BSP work)

This repository grows as I progress through each learning milestone.

What each directory is for build/conf/ Contains the development local.conf and bblayers.conf used during learning and experimentation. meta-root_v1/ My first custom Yocto layer. Includes early recipes, experiments, and image modifications. docs/ Learning notes on Yocto internals, build flow, rootfs structure, and other recorded insights. Current Focus Areas

During this phase, I’m concentrating on:

1. Layer Creation & Organization Designing meta-root_v1 from scratch Adding simple custom recipes Extending images with extra packages Understanding how BitBake parses and resolves tasks
2. Build Configuration Editing and tuning local.conf Adding/remove layers Managing different MACHINE targets Exploring features such as: image types rootfs options compression package formats build performance

Documenting everything I learn to build a strong foundation for future phases:

Yocto architecture Recipe anatomy How tasks execute Rootfs generation Image building pipeline Build Instructions (Learning Mode)

These steps reflect my current learning workflow. They will evolve as the project matures.

1. Source environment source oe-init-build-env build
2. Ensure layer is included

Check bblayers.conf to confirm:

${TOPDIR}/../meta-root_v1
3. Build a target image

Example:

bitbake core-image-minimal 4. Output artifacts

After a successful build:

build/tmp/deploy/images/raspberrypi5/

The documentation grows as I proceed through the roadmap. Roadmap (Learning Phase Preview) Complete Yocto fundamentals Rebuild full pipeline from scratch Set up hash equivalence server Work on kernel configuration + modules Add real projects (robotics, perception stack, services) Explore Linux security modules (final stage) Status

This repository is in active learning and experimentation mode. Expect iterative improvements, refactoring, and documentation updates as I master each subsystem.