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.
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Linux Kernel
Linux Kernel
Enable and Disable Wireless / WiFi from command line
Rfkill is a tool for enabling and disabling wireless devices. We use “rfkill list” command as below … Read more
Turn ON and Turn OFF Bluetooth from command line
Rfkill is a tool for enabling and disabling wireless devices. Using “rfkill list” command we first check … Read more
Extract files from jffs2 root filesystem image
[ Note: following commands has been tried on ubuntu 16.04, but should work on other Linux distros … Read more
Creating jffs2 filesystem image for embedded target platform
What is JFFS2 ?=> JFFS2 is a log-structured file system designed for use on flash devices in … Read more
Join Linux kernel mailing lists (LKML)
LKML https://lkml.org/ is an unofficial Linux Kernel Mailing List archive. This mailing list is a rather high-volume … Read more
Compile and Install device-tree-compiler (DTC) On Ubuntu
If you want to install device-tree-compiler i.e. dtc command on Ubuntu, use following command, This command will … Read more
Compile DTS to DTB from Linux kernel and manually
Lets say, you have been trying to compile Linux kernel source code for Raspberry Pi following steps … Read more
What is Linux Out-Of-Memory OOM Killer
Major distribution kernels set the default value of /proc/sys/vm/overcommit_memory to zero, which means that processes can request … Read more
Avoid a process from being killed in case of Out of Memory
In our previous post, we understood “What is Out of Memory Killer ?” In this post, we … Read more
Insmod: ERROR: could not insert module hello.ko
We tried to write a simple class driver framework which will create a directory in /sys/class, we … Read more
Understanding Linux Kernel Version Numbering
The main Linux kernel versions comes from the Linux Torvald who is author of Linux kernel, from … Read more
Recreate dts file from a running Android device
As we have seen in “How to cross compile static dtc for ARM” we are able to … Read more
Recreate dts file from live Embedded device
Sometimes it happens that you don’t have source code of the device on which you are working … Read more
Resolve : fatal error: curses.h: No such file or directory
Whenever you are trying to do kernel menuconfig very first time after installation of Ubuntu, its chances … Read more
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.
Monitoring Linux File System Events in C with inotify System Calls
Write a C program in Linux using inotify_init and inotify_add_watch to monitor directory file creation, modification, and deletion events in real time.
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.
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.
Send and receive data from user space and kernel using Netlink sockets
As mentioned in Linux kernel souce code net/netlink/af_netlink.c, netlink is a Kernel-user communication protocol which allows user … Read more
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.