CODEWITHSUNDEEP
linux-kernellinux-device-driver
Tar
Tar

Reputation: 9015

How to make my device driver load on system start-up?

My hello world device:

#include <linux/init.h>
#include <linux/module.h>
MODULE_LICENSE("Dual BSD/GPL");

static int hello_init(void) {
    printk(KERN_ALERT "hello world\n");
    return 0;
}

static void hello_exit(void) {
    printk(KERN_ALERT "goodbye world\n");
}

module_init(hello_init);
module_exit(hello_exit);

How can I make my driver to load automatically during start-up?

I can load it manually successfully using insmod, but I want it to be automatically loaded after a reboot. Do I need to use Kbuild and select it in make menuconfig, or do we do that some other way?

Upvotes: 2

Views: 2705

Answers (2)

Milind Dumbare
Milind Dumbare

Reputation: 3234

Install the module in /lib/modules/<kernel version>

Add the module name to /etc/modules if On Debian/Ubuntu Systems or Add the module name to /etc/modules.conf if On RH/Fedora/CentOS systems

Upvotes: 0

Marco Guerri
Marco Guerri

Reputation: 942

On systemd based systems, there is /lib/systemd/system/systemd-modules-load.service which 

[...] reads files from the above directories
which contain kernel modules to load during
boot in a static list

See here for a list of directories used by that systemd service.

You can simply add a .conf file containing the name of the module you want to load at boot. The module must be correctly installed under /lib/modules and loadable with modprobe.

Upvotes: 3

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