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<title>2.3. Kernel Linux</title>
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<a href="index.html">Core OS Index</a>
<h1 id="kernel">2.3. Kernel Linux</h1>
<p>Linux is a monolith kernel, a big one ! Visit
<a href="http://www.fsfla.org/ikiwiki/selibre/linux-libre/">Linux Libre</a>
and
<a href="https://www.kernel.org/">Linux Non-Libre</a> pages for more links
and information.</p>
<h2 id="#linuxlibre">2.3.1. Port Linux Libre</h2>
<p>Collection c9-ports have linux-libre port with default crux
configuration, this port depends on dracut and grub but is not
required to install them. To build and install this port using
prt-get;</p>
<pre>
$ prt-get depinst linux-libre
</pre>
<h2 id="kinstall">2.3.2. Manual Install</h2>
<p>Download Linux Source from
<a href="http://linux-libre.fsfla.org/pub/linux-libre/releases/">linux libre</a>,
or using the port system;</p>
<pre>
$ cd /usr/ports/c9-ports/linux-libre
$ sudo -u pkgmk pkgmk -do
</pre>
<p>Crux iso comes with config that is used in this port, is
a good starting point to personalize according to your needs;</p>
<pre>
$ mkdir ~/kernel
$ cd ~/kernel
$ cp /usr/ports/c9-ports/linux-libre/linux-4.1.32.defconfig .
$ cp /usr/ports/distfiles/linux-libre-4.1.32-gnu.tar.xz .
$ tar xf linux-libre-4.1.32-gnu.tar.xz
$ cp linux-4.1.32.defconfig linux-4.1.32/.config
</pre>
<p>If you like <a href="https://github.com/graysky2/kernel_gcc_patch/">graysky2</a> kernel_gcc_patch (<a href="https://github.com/graysky2/kernel_gcc_patch/archive/master.zip">download master</a>) that adds more cpu options (FLAGS native)</p>
<pre>
$ cp /usr/ports/distfiles/enable_additional_cpu_optimizations_for_gcc_v4.9%2B_kernel_v3.15%2B.patch cpu_optimizations.patch
</pre>
<pre>
$ cd ~/linux-4.1.32/
$ patch -p1 < ../cpu_optimizations.patch
patching file arch/x86/include/asm/module.h
patching file arch/x86/Kconfig.cpu
patching file arch/x86/Makefile
Hunk #1 succeeded at 85 with fuzz 1 (offset -9 lines).
patching file arch/x86/Makefile_32.cpu
$
</pre>
<p>Read <a href="https://en.wikibooks.org/wiki/Grsecurity/Configuring_and_Installing_grsecurity#Patching_Your_Kernel_with_grsecurity">Gresecurity</a>.</p>
<p>Configure kernel according to your current kernel
hardware support;</p>
<pre>
$ make localmodconfig
</pre>
<p>This will disable all unloaded modules,
you can use localyesconfig mark all loaded
to be built in the kernel.</p>
<p>To get information about your hardware,
for example information about which graphic
module (driver) is in use as root run;</p>
<pre>
# lspci -nnk | grep -i vga -A3 | grep 'in use'
Kernel driver in use: i915
</pre>
<p>Before start compiling check configuration;</p>
<pre>
$ make nconfig
</pre>
<pre>
$ cd ~/linux-4.1.32/
$ make -j $(nproc) all
$ sudo make modules_install
$ sudo cp arch/x86/boot/bzImage /boot/vmlinuz-4.1.32
$ sudo cp System.map /boot/System.map-4.1.32
</pre>
<h2 id="kuninstall">2.3.3. Manual Remove</h2>
<pre>
$ sudo rm -r /lib/modules/4.5.5-gnu
$ sudo rm /boot/vmlinuz-4.5.5
$ sudo rm /boot/System.map-4.5.5
</pre>
<a href="index.html">Core OS Index</a>
<p>This is part of the c9-doc Manual.
Copyright (C) 2016
Silvino Silva.
See the file <a href="../fdl-1.3-standalone.html">Gnu Free Documentation License</a>
for copying conditions.</p>
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