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86 lines
2.2 KiB
Markdown
86 lines
2.2 KiB
Markdown
# Linux kernel modules
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1. [TL;DR](#tldr)
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1. [Load modules on boot](#load-modules-on-boot)
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1. [Permanent modules configuration](#permanent-modules-configuration)
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1. [Further readings](#further-readings)
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1. [Sources](#sources)
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## TL;DR
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```sh
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# Show what kernel modules are currently loaded.
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lsmod
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# List all modules built into the currently running kernel.
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cat "/lib/modules/$(uname -r)/modules.builtin"
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# List all available modules.
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find "/lib/modules/$(uname -r)" -type f -name '*.ko*'
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# Show information about a module.
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modinfo 'module_name'
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# List the options set for loaded modules.
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systool -v -m 'module_name'
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# Show the comprehensive configuration of modules.
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modprobe -c
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modprobe -c | grep 'module_name'
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# List the dependencies of modules or aliases.
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# Includes the module itself.
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modprobe --show-depends 'module_name'
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# Load modules.
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modprobe 'module_name'
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modprobe 'module_name' 'parameter_1=value' 'parameter_n=value'
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# Load modules by file name.
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# For those not installed in "/usr/lib/modules/$(uname -r)/".
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insmod 'file_name' 'arg_1' 'arg_n'
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# Unload modules.
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modprobe -r 'module_name'
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rmmod 'module_name'
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```
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## Load modules on boot
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If using Systemd, put lists of modules in `.conf` files in the `/etc/modules-load.d/` directory:
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```sh
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$ cat '/etc/modules-load.d/ddcutil.conf'
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i2c-dev
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```
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## Permanent modules configuration
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Write the options in a `.conf` file in `/etc/modprobe.d/`:
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```conf
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# /etc/modprobe.d/raspi-wifi-workaround.conf
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options brcmfmac roamoff=1 feature_disable=0x82000
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```
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## Further readings
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- The [Kernel module][arch wiki kernel module] page in the [Arch wiki]
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- The [Kernel modules][gentoo wiki kernel modules] page in the [Gentoo wiki]
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### Sources
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- [How to load a kernel module automatically at boot time]
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<!--
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Reference
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═╬═Time══
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-->
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<!-- Others -->
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[arch wiki]: https://wiki.archlinux.org
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[arch wiki kernel module]: https://wiki.archlinux.org/title/Kernel_module
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[gentoo wiki]: https://wiki.gentoo.org/wiki/Main_Page
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[gentoo wiki kernel modules]: https://wiki.gentoo.org/wiki/Kernel_Modules
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[how to load a kernel module automatically at boot time]: https://www.cyberciti.biz/faq/linux-how-to-load-a-kernel-module-automatically-at-boot-time/
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