This article explains the Linux kernel wait‑queue mechanism, detailing its data structures, sleep states, step‑by‑step process‑sleep and wake‑up procedures, core APIs, and a practical key‑driver example that demonstrates efficient blocking I/O without wasting CPU cycles.
This article explains the different Linux kernel delay mechanisms—busy delays like udelay, sleep delays like mdelay, and high‑resolution timers—detailing their inner workings, appropriate use cases, performance trade‑offs, and common pitfalls so developers can write efficient, stable driver code for industrial‑grade systems.
This article compiles a comprehensive set of technical interview questions and concise answers covering Linux kernel‑user communication, interrupt handling, memory allocation strategies, macros, endianness, cache hierarchy, process context, DMA, virtual memory translation, debugging tools, and driver initialization, aimed at candidates preparing for embedded Linux driver roles.
This article explains the purpose of dev_info, dev_dbg, and dev_err in Linux kernel logging, shows how to view their output, and provides step‑by‑step methods—including dynamic debug, kernel configuration, and module parameters—to enable or disable dev_dbg at runtime without recompiling or rebooting.
The article explains the advantages of encapsulating device drivers and peripheral code into reusable libraries, outlines best practices for creating clean, platform‑independent libraries, and discusses the trade‑offs such as slight performance overhead and code‑size considerations for embedded systems.
This article explains the complete Linux interrupt mechanism—from hardware signal generation, through the programmable interrupt controller and CPU response, to the split top‑half and bottom‑half handling and driver registration—providing developers and operators with a clear understanding of how microsecond‑level hardware events are processed efficiently.
This article explains how integrating Go with assembly language can overcome Go's performance and low‑level control limits for system and driver development, covering basic concepts, integration methods, multi‑CPU architecture support, practical code examples, and the resulting performance and portability benefits.
This article shares practical insights from a Linux driver engineer on device trees, cross‑compilation toolchains, filesystem considerations, kernel configuration, and debugging techniques that every newcomer should understand to avoid common pitfalls and integrate drivers successfully.
This article explains the layered architecture of the Linux network stack, maps the TCP/IP model to Linux implementation, and details how hardware and soft interrupts, ksoftirqd threads, and NAPI cooperate with driver initialization to process packet reception and transmission.
This guide explains how the of_device_id structure and of_device_get_match_data() function enable flexible device matching in ARM‑based SoCs, covering their definitions, usage patterns, code examples, troubleshooting tips, and how to expose device tables to user space.
This guide outlines six effective debugging techniques—including dtdiff, kernel device‑tree inspection, U‑Boot fdt commands, dtc decompilation, kernel fdt inspection, and of_property APIs—to help developers quickly locate and resolve device‑tree‑related issues during driver development.
