Embedded Linux¶

Notes on how embedded Linux systems boot, run, update, and recover.

Boot Flow¶

• The ARM Linux Boot Flow
• Linux Falcon Mode

Kernel Internals¶

• Understanding Linux Kernel Image Files
• Loading Linux Kernel Modules
• Linux Buffers and Cache
• Time Synchronization Options for Embedded Systems
• Priority Inversion and How to Address It
• An Introduction to Real-time Optimization for Embedded Linux

Filesystems¶

• A Practical Introduction to Embedded Filesystems
• Mounting a JFFS2 Filesystem in Linux

OTA and Security¶

• OTA Firmware Updates for Embedded Systems
• OTA A/B Partitions: U-Boot Environment Variables
• Embedded Security Overview

Debugging and Optimization¶

• The devmem Linux Kernel Debugging Tool
• Dynamic Debug
• perf Debugging (Part 1)
• perf Debugging (Part 2)
• Monitoring Directories in Linux
• Adding a Custom systemd Service