Stage 09

Root Filesystem & Init Systems

Build the environment your applications run in. Understand filesystem types, init systems, and how to create minimal rootfs images for production embedded targets.

All Topics

Topic 01

BusyBox

Configure and compile BusyBox, build a minimal rootfs from scratch, set up init scripts, and create a bootable image.

Start Learning

Topic 02

systemd

Unit files, service management, targets, socket activation, journald, and minimizing boot time with systemd on embedded.

Start Learning

Topic 03

SysVinit & Runlevels

Init scripts, runlevels, /etc/inittab, rc.d directories, and writing portable init scripts for legacy embedded systems.

Start Learning

Topic 04

Filesystem Types

ext4, squashfs, tmpfs, overlayfs — when to use each, creating images, mounting, and flash storage wear-leveling.

Start Learning

Topic 05

NFS & initramfs

NFS root for rapid development, creating initramfs images, pivot_root, and in-memory rootfs for production systems.

Start Learning