Linux Kernel
Read guide setup_irq vs request_irq in Modern Linux
setup_irq belongs to historical early-platform code. Current device drivers should register handlers with request_irq, request_threaded_irq, or a device-managed wrapper.
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Linux Kernel
Read guide Triggering the Linux Kernel OOM Killer Manually to Analyze Process Selection Scores
Learn how to manually trigger the Linux Kernel Out-Of-Memory (OOM) killer via SysRq, inspect /proc/pid/oom_score, and protect critical processes.
Linux Kernel
Read guide Bi-Directional Communication Between User-Space and Linux Kernel via Netlink Sockets
Learn bi-directional user-space to Linux kernel communication using Netlink sockets (AF_NETLINK) with full C kernel module and user client examples.
Linux Kernel
Read guide Linux USB Composite Gadget Architecture: ConfigFS, Drivers, and Execution Flow
Explore Linux USB composite gadget architecture: ConfigFS setup scripts, struct usb_function kernel driver flows, UDC bindings, and endpoint allocation.
Linux Kernel
Read guide Direct Screen Drawing in Linux: A Hands-on Guide to Framebuffer Programming in C
Program Linux framebuffer devices (/dev/fb0) in C: query screen resolution via ioctl, map video memory with mmap, and render raw RGB pixel buffers.
Linux Kernel
Read guide Building Custom Embedded Linux Kernels: From Defconfig to Production Deployment
Master custom embedded Linux kernel compilation: configure defconfig, strip bloated subsystems, tune menuconfig, compile DTBs, and boot on ARM hardware.
Linux Kernel
Read guide Fix Yocto QA Issue : “was already stripped, this will prevent future debugging !”
Fix Yocto BitBake build warning "QA Issue: binary was already stripped": configure INSANE_SKIP += "already-stripped" or prevent premature binary stripping.
Linux Kernel
Read guide Cross Compile Busybox for ARM
Cross-compile BusyBox for ARM embedded targets: configure defconfig, set ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-, build statically, and install.
Linux Kernel
Read guide Optimize Performance in Embedded Linux Applications: Best Practices and Tips
Optimize C/C++ application performance on embedded Linux: profile CPU bottlenecks using perf, reduce RAM footprint, use static linking, and tune LTO.