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<title>3. Kernel Linux</title>
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<a href="index.html">Systools Index</a>
<h1 id="kernel">3.6. Kernel Linux</h1>
<p>Linux is a monolith kernel, a big one !!!.</p>
<p>This instructions are done
with <a href="install.html#step6">active chroot</a>
and inside chroot;</p>
<pre>
# chroot $CHROOT /bin/bash
</pre>
<h2 id="#linuxlibre">3.6.1. Port Linux Libre</h2>
<p>This will install <a href="../ports/linux-libre/">linux-libre</a> port
and dracut;</p>
<pre>
$ prt-get depinst linux-libre
</pre>
<h2 id="kinstall">3.6.2. Manual Install</h2>
<p>Download Linux Source from <a href="http://linux-libre.fsfla.org/pub/linux-libre/releases/">linux libre</a>, this ensure that kernel is free of blobs.</p>
<pre>
$ pkgmk -do
</pre>
<p>Crux iso comes with config that you can use as
a starting point.</p>
<pre>
cp ../linux-4.5.5.defconfig .config
$ make oldefconfig
</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>
$ unzip kernel_gcc_patch-master.zip
</pre>
<pre>
$ cd ~/linux-4.5.5/
$ patch -p1 < ../kernel_gcc_patch-master/enable_additional_cpu_optimizations_fo
r_gcc_v4.9+_kernel_v3.15+.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 (offset -7 lines).
patching file arch/x86/Makefile_32.cpu
</pre>
<p><a href="https://en.wikibooks.org/wiki/Grsecurity/Configuring_and_Installing_grsecurity#Patching_Your_Kernel_with_grsecurity">Gresecurity</a></p>
<pre>
patch -p1 < $SRC/grsecurity-3.1-4.5.5-201605291201.patch
</pre>
<p>Configure kernel according to your current kernel
hardware support run;</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. This example
get information about which graphic
module (driver) is in use;</p>
<pre>
# lspci -nnk | grep -i vga -A3 | grep 'in use'
Kernel driver in use: i915
#
</pre>
<pre>
$ cd ~/linux-4.5.5/
$ make -j $(nproc) all
$ sudo make modules_install
$ sudo cp arch/x86/boot/bzImage /boot/vmlinuz-4.5.5
$ sudo cp System.map /boot/System.map-4.5.5
</pre>
<h2 id="kuninstall">3.6.3. 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">Systools Index</a>
<p>This is part of the SysDoc 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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