2023-03-16 21:13:13 +00:00
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# The Linux-libre dist-kernel
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This overlay provides a dist-kernel (based on
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`sys-kernel/vanilla-kernel`) using the Linux-libre kernel sources, and
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an accompanying updated version of `virtual/dist-kernel`. It is
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maintained and tested for my personal use on amd64. The Linux-libre
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kernel removes the ability for the Linux kernel to load firmware that
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is not [Free Software][free-software]. The ebuild roughly follows the
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2024-01-08 13:41:02 +00:00
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current stable 5.15.x gentoo-kernel for amd64.
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2023-03-16 21:13:13 +00:00
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The libre kernel can be installed alongside other dist-kernels, and
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works with the `dist-kernel` and `initramfs` USE flags. The ebuild
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does NOT fail if non-free firmware (i.e. `sys-kernel/linux-firmware`
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with `redistributable` USE flag set) is installed, but it will warn
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you if this is the case. It will also warn you if the `linux-firmware`
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package is not found at all, like normal dist-kernel ebuilds.
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The kernel installed by this ebuild has the version suffix
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`-gnu-dist`, making it easy to determine which kernel it is.
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## Quick Setup
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This is a quick guide for setting up the system to properly install the
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Linux-libre Kernel. It assumes you have set up the overlay as described
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in the README.
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In `/etc/portage/package.use`:
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```
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# Install only libre firmware
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sys-kernel/linux-firmware -redistributable -unknown-license
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# libre kernel with gentoo kernel patches applied
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sys-kernel/libre-kernel verify-sig
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# or, if you do not want gentoo patches applied
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sys-kernel/libre-kernel verify-sig -gentoo
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```
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In `/etc/portage/package.unmask`:
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```
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sys-kernel/libre-kernel::projectmoon
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virtual/dist-kernel::projectmoon
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2023-04-14 07:46:54 +00:00
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virtual/linux-sources::projectmoon
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2023-03-16 21:13:13 +00:00
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sec-keys/openpgp-keys-linux-libre::projectmoon
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```
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In `/etc/portage/package.accept_keywords`:
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```
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sys-kernel/librem-ec-acpi::projectmoon
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sys-kernel/libre-kernel::projectmoon ~amd64
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virtual/dist-kernel::projectmoon
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2023-04-14 07:46:54 +00:00
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virtual/linux-sources::projectmoon
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2023-03-16 21:13:13 +00:00
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```
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In `/etc/portage/package.mask`:
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```
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# stay on libre kernel
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sys-kernel/gentoo-kernel
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sys-kernel/gentoo-kernel-bin
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sys-kernel/vanilla-kernel
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```
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## Detailed Instructions
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The rest of this documentation covers the quick steps above in detail,
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and extra information about the Linux firmware package, the Librem EC
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ACPI module, etc.
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### Signature Verification
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It is recommended to enable GPG signature verification of
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`sys-kenrel/libre-kernel` by adding the USE flag to
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o`/etc/portage/package.use`:
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```
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sys-kernel/libre-kernel verify-sig
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```
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### Keeping the Linux-libre Kernel Installed
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Portage will sometimes try to install `sys-kernel/gentoo-kernel` or
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another dist-kernel if there is a newer stable version than
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`sys-kernel/libre-kernel`. This happens because of a version bump to
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`virtual/dist-kernel` before this overlay has updated its own copy of
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`virtual/dist-kernel`.
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To prevent portage from attempting to install another dist-kernel
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instead of the Linux-libre kernel, you should mask other dist-kernels in
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`/etc/portage/package.mask`:
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```
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# stay on libre kernel
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sys-kernel/gentoo-kernel
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sys-kernel/gentoo-kernel-bin
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sys-kernel/vanilla-kernel
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```
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### Linux Firmware
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*Note: If you are running the Linux-libre kernel, it is unlikely (though
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not impossible) that you need to install `sys-kernel/linux-firmware`.*
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To install only the Linux firmware that meets the [Free Software
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Definition][free-software], configure `/etc/portage/package.use`
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accordingly:
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```
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# Install only libre firmware
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sys-kernel/linux-firmware -redistributable -unknown-license
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```
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You can also edit `/etc/portage/profile/package.use.mask` to prevent
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the linux-firmware package from ever installing the closed-source
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firmware by adding this line:
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```
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# forcibly stop non-free firmware installation
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sys-kernel/linux-firmware redistributable unknown-license
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```
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### Using the Librem EC ACPI kernel module
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The Librem EC ACPI kernel module should install and be automatically
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available (via modprobe) after installation, using `emerge
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sys-kernel/librem-ec-acpi`. The module is currently installed to
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`/lib/modules/<kernel>/librem/`.
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This ebuild supports the `dist-kernel` USE flag, and the module will
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automatically be rebuilt when installing a new dist-kernel if that
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flag is enabled.
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If you are not using a dist-kernel, you will need to do `emerge
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@modules-rebuild` to install the module after you upgrade or install a
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new kernel.
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[free-software]: https://www.gnu.org/philosophy/free-sw.en.html#fs-definition
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[linux-libre]: https://www.fsfla.org/ikiwiki/selibre/linux-libre/
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[free-software]: https://www.gnu.org/philosophy/free-sw.en.html#fs-definition
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