Why Build a Physical Gun Controller? As someone who loves gaming, I spent last night building something I’ve always wanted: a physical gun that actually aims in games based on where I point it in ...

The Problem: When Your Root Filesystem Fails During embedded Linux development, we often encounter situations where the root filesystem (rootfs) mounting fails, leading to a dreaded kernel panic. ...

Introduction I recently built a cooling fan for my laptop with an interesting twist: instead of using a microcontroller or development board, I wanted to control it directly using the laptop’s own...

Using Mobile Phone as Rootfs I was thinking about this scenario: I was somewhere and forgot to bring my USB storage that contains my rootfs. What should I do? I’ll use my phone instead. We can us...

I started thinking about reading a program from an unconventional type of memory — paper. It reminded me of punched cards, but since that hardware isn’t available, I went for the next best thing: a...

When you develop software for architectures different from the host (usually x86-64), you need a cross toolchain. There are three common approaches: build a toolchain from scratch download a ...

Problem You may see this error in U-Boot when booting a kernel: Did not find a cmdline Flattened Device Tree Could not find a valid device tree Root cause: the kernel image ended up larger than e...

Adding a custom syscall is one of the most direct ways to extend the kernel–user interface. Below is a concise overview of how it’s structured and what each step means conceptually — not just how t...

Kernel command line is basically a string passed from the bootloader to the kernel to tune behavior or pass settings at boot time. Some cmdline parameters are meaningful to the kernel — that means...

Start with two simple questions an application developer and a driver developer often ask: As an application developer, do I need to know which exact device my browser will run on — a single de...