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wiki/notebook/linux.kernel-options.org
Gabriel Arazas b088086b06 Merge evergreen notes into the notebook 
Now, it's all under the notebook umbrella. Seems to be appropriate as it
is just my notes after all.

I also updated some notes from there. I didn't keep track of what it is
this time. Something about more learning notes extracted from my
"Learning how to learn" course notes and then some. Lack of time and
hurriness just makes it difficult to track but it should be under
version control already.
2021-07-21 16:28:07 +08:00

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Linux kernel options

  • Gentoo wiki page on kernels
  • Linux also has official documentation on kernel.org and tldp.org
  • the kernel is large today, most of which can be configured to be compiled or not; there is a default configuration when compiling the kernel

  • most of the features you would expect can be included

    • run ELF binaries
    • various filesystem support
    • virtualization support
    • Android drivers
    • debugging options for kernel hacking
    • pseudo-filesystems
    • most drivers for common hardware (e.g., LED, USB, and network devices)
    • special hardware drivers (e.g., Steam controller, Nintendo Wii)
  • most of the options can be configured either to be included inside of the kernel image or as an external module

  • most of the features are available as kernel options

    • CONFIG_HID_GENERIC enables support for generic devices such as mice, keyboards, joysticks
    • you can know what compile options is included from the kernel with /proc/config.gz but only if CONFIG_IKCONFIG_PROC is included
    • CONFIG_HID_BATTERY_STRENGTH enables reporting battery strength
  • you can know what kernel options of the compiled kernel by looking at /proc/config.gz (e.g., gunzip --stdout /proc/config.gz | bat); though, it is only possible if compiled with CONFIG_IKCONFIG_PROC option.