Linux Device Drivers

A practical introduction to Linux Device Drivers

George Calin
Apr 13 · 6 min read

Loadable kernel modules and statically linked modules

Comparison between statically linked modules and loadable kernel modules

Driver commands

insmod

The directory where the Loadable Kernel Modules are stored
How to use the insmod command practically

rmmod

How to use the rmmod command

lsmod

How to use the lsmod command

depmod

How to verify the dependency of a given dynamically loaded kernel module (Loadable Kernel Module)

modinfo

How to use the modinfo command to show information about a Linux Kernel Module

modprobe

How to load a dynamically loaded kernel module (Loadable Kernel Module) with modprobe
How to verify if the dynamic module (LKM Loadable Kernel Module) has been loaded into the Kernel (with modprobe in this case)

Configuration and blacklist files, define and use parameters with the Loadable Kernel Modules (LKM)

The directory /etc/modules.d

Configuration files in the directory /etc/modprobe.d
The content of a loadable module configuration file
This is a blacklist for loadable kernel modules (never load these loadable kernel modules)

modinfo -p

How to define the parameters of a loadable kernel module

How to pass the parameters to a loadable kernel module

The directory /sys/module

The structure of /sys/module/ directory
Each module (either statically linked and dynamically loaded) has its own subdirectory in /sys/module. An example for a network module
A look inside a parameter file

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George Calin

Written by

10+ years of experience in a blend of mentoring, programming, business intelligence, people and logistics management :: https://www.linkedin.com/in/cgeorge1978/

Geek Culture

A new tech publication by Start it up (https://medium.com/swlh).

George Calin

Written by

10+ years of experience in a blend of mentoring, programming, business intelligence, people and logistics management :: https://www.linkedin.com/in/cgeorge1978/

Geek Culture

A new tech publication by Start it up (https://medium.com/swlh).

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