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-title = "Gentoo kernel upgrade"
-summary = "Little howto on updating the kernel in a Gentoo system"
-+++
-
-## Preliminary steps
-
-Fetch the sources of the kernel that you want to install.
-
-```sh {class="cmd-root"}
-emerge -uDUa --with-bdeps=y =sys-kernel/gentoo-sources-X.Y.Z
-```
-You may also need to update @world set before updating the kernel.
-
-```sh {class="cmd-root"}
-emerge -uDUa --with-bdeps=y @world
-```
-
-Using eselect, select the kernel version that you want to upgrade to.
-
-```sh {class="cmd-root"}
-eselect kernel list
-eselect kernel set X
-```
-
-Go to the directory containing kernel sources.
-
-```sh {class="cmd-root"}
-cd /usr/src/linux
-```
-
-## Configuration
-
-Start by copying your `.config` from the old kernel sources.
-
-```sh {class="cmd-root"}
-cp /usr/src/linux-A.B.C-gentoo/.config /usr/src/linux
-```
-
-Then, you will have to update the configuration file. The oldconfig command will interactively prompt you to insert values for the new options.
-
-```sh {class="cmd-root"}
-make oldconfig
-```
-
-Alternatively, the olddefconfig command will automatically insert default values for the new options.
-
-```sh {class="cmd-root"}
-make olddefconfig
-```
-
-To easily change more configuration options you can use the menuconfig command, which will start an interactive ncurses interface.
-
-```sh {class="cmd-root"}
-make menuconfig
-```
-
-{{< note Warning >}}
-Manually editing the `.config` file is highly discouraged.
-{{< /note >}}
-
-## Building
-
-Once you finished setting your configuration, you can build your kernel with make.
-You can speed up the build process by using multiple make jobs (determine the number with nproc).
-
-```sh {class="cmd-root"}
-make -jN
-```
-
-## Intel microcode addendum
-
-Firstly, install the microcode firmware and the tool to manage it.
-
-```sh {class="cmd-root"}
-emerge sys-firmware/intel-microcode
-```
-
-Use the newly installed `iucode_tool` to get the processor signature and search a microcode bundle with a matching signature.
-
-```sh {class="cmd-root"}
-iucode_tool -S
-iucode_tool -S -l /lib/firmware/intel-ucode/*
-```
-
-Enable in the kernel configuration the microcode loading features. Then, add in the `Firmware loading facility` the microcode
-bundle found before as a named firmware blob.
-
-After building the kernel, you can easily verify after the boot that the microcode is loaded with dmesg.
-
-```sh {class="cmd-root"}
-dmesg | grep microcode
-```
-
-## Installation
-
-First of all, mount the boot partition, if it is not already mounted.
-
-```sh {class="cmd-root"}
-mount /dev/XXX /boot
-```
-
-Then, you can install the new kernel and modules.
-
-```sh {class="cmd-root"}
-make install
-make modules_install
-```
-
-Update your bootloader configuration. If you are using GRUB, you can use grub-mkconfig.
-
-```sh {class="cmd-root"}
-grub-mkconfig -o /boot/grub/grub.cfg
-```
-
-Some kernel modules may be installed by packages and live outside of the kernel source tree (e.g. Nvidia drivers), and need to be rebuilt.
-
-```sh {class="cmd-root"}
-emerge @module-rebuild
-```
-
-Additionally, updating the firmware may be required by some drivers.
-
-```sh {class="cmd-root"}
-emerge sys-kernel/linux-firmware
-```
-
-## References
-- https://wiki.gentoo.org/wiki/Kernel
-- https://wiki.gentoo.org/wiki/Kernel/Upgrade
-- https://wiki.gentoo.org/wiki/Kernel/Removal
-- https://wiki.gentoo.org/wiki/Intel_microcode