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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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558 lines
36 KiB
HTML
558 lines
36 KiB
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<meta name="description" content="The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. EVERYTHING is built from source. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 20.04 host.">
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<title>Linux Kernel Module Cheat</title>
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|
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</head>
|
||
<body id="introduction-to-buildroot" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect2">
|
||
<h3 id="introduction-to-buildroot"><a class="anchor" href="#introduction-to-buildroot"></a><a class="link" href="#introduction-to-buildroot">26.1. Introduction to Buildroot</a></h3>
|
||
<div class="paragraph">
|
||
<p><a href="https://en.wikipedia.org/wiki/Buildroot">Buildroot</a> is a set of Make scripts that download and compile from source compatible versions of:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>GCC</p>
|
||
</li>
|
||
<li>
|
||
<p>Linux kernel</p>
|
||
</li>
|
||
<li>
|
||
<p>C standard library: Buildroot supports several implementations, see: <a href="libc-choice.html">Section 26.10, “libc choice”</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://en.wikipedia.org/wiki/BusyBox">BusyBox</a>: provides the shell and basic command line utilities</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>It therefore produces a pristine, blob-less, debuggable setup, where all moving parts are configured to work perfectly together.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Perhaps the awesomeness of Buildroot only sinks in once you notice that all it takes is 4 commands as explained at <a href="buildroot-hello-world.html">Section 26.11, “Buildroot hello world”</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The downsides of Buildroot are:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>the first build takes a while compared to downloading prebuilts, but it is well worth it</p>
|
||
</li>
|
||
<li>
|
||
<p>the selection of software packages is relatively limited if compared to Debian.</p>
|
||
<div class="paragraph">
|
||
<p>In theory, any software can be packaged, and the Buildroot side is easy.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The hard part is dealing with crappy third party build systems and huge dependency chains.</p>
|
||
</div>
|
||
</li>
|
||
<li>
|
||
<p>it is written in Make and Bash rather than Python like LKMC</p>
|
||
</li>
|
||
<li>
|
||
<p>it downloads packages from upstream mirrors rather than having its own copy of them. Therefore, whenever <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/issues/165">some random French research institute decides to break links, your build also breaks</a>. This is not acceptable. There are some mirroring options: <a href="https://risc-a-day.blogspot.com/2015/10/creating-local-mirror-for-buildroot.html" class="bare">https://risc-a-day.blogspot.com/2015/10/creating-local-mirror-for-buildroot.html</a> but it’s not on by default it seems, Buildroot has to have their own official and default mirror of everything.</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This repo basically wraps around that, and tries to make everything even more awesome for kernel developers by adding the capability of seamlessly running the stuff you’ve built on emulators usually via <code>./run</code>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This runnable part of selecting the command line options for different emulators and setups is to a large extent what <a href="https://en.wikipedia.org/wiki/Libvirt">Libvirt</a> does. But we feel that having both build and run on the same repository is the key.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>As this repo develops however, we’ve started taking some of the build out of Buildroot, e.g. notably the <a href="buildroot-vanilla-kernel.html">Linux kernel</a> to have more build flexibility and faster build startup times.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Therefore, more and more, this repo wants to take over everything that Buildroot does, and one day completely replace it to achieve emulation Nirvana, see e.g.:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/issues/116" class="bare">https://github.com/cirosantilli/linux-kernel-module-cheat/issues/116</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/issues/117" class="bare">https://github.com/cirosantilli/linux-kernel-module-cheat/issues/117</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="ulist">
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||
<ul>
|
||
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|
||
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|
||
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|
||
<div class="paragraph nav-footer">
|
||
<p>↑ Up: <a href="buildroot.html">Buildroot</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="custom-buildroot-configs.html">Custom Buildroot configs</a> →</p>
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