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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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558 lines
35 KiB
HTML
558 lines
35 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="downgrade-the-linux-kernel" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="downgrade-the-linux-kernel"><a class="anchor" href="#downgrade-the-linux-kernel"></a><a class="link" href="#downgrade-the-linux-kernel">17.2.3. Downgrade the Linux kernel</a></h4>
|
||
<div class="paragraph">
|
||
<p>The kernel is not forward compatible, however, so downgrading the Linux kernel requires downgrading the userland too to the latest Buildroot branch that supports it.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The default Linux kernel version is bumped in Buildroot with commit messages of type:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>linux: bump default to version 4.9.6</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>So you can try:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>git log --grep 'linux: bump default to version'</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Those commits change <code>BR2_LINUX_KERNEL_LATEST_VERSION</code> in <code>/linux/Config.in</code>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>You should then look up if there is a branch that supports that kernel. Staying on branches is a good idea as they will get backports, in particular ones that fix the build as newer host versions come out.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Finally, after downgrading Buildroot, if something does not work, you might also have to make some changes to how this repo uses Buildroot, as the Buildroot configuration options might have changed.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>We don’t expect those changes to be very difficult. A good way to approach the task is to:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>do a dry run build to get the equivalent Bash commands used:</p>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-buildroot --dry-run</pre>
|
||
</div>
|
||
</div>
|
||
</li>
|
||
<li>
|
||
<p>build the Buildroot documentation for the version you are going to use, and check if all Buildroot build commands make sense there</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Then, if you spot an option that is wrong, some grepping in this repo should quickly point you to the code you need to modify.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>It also possible that you will need to apply some patches from newer Buildroot versions for it to build, due to incompatibilities with the host Ubuntu packages and that Buildroot version. Just read the error message, and try:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><code>git log master — packages/<pkg></code></p>
|
||
</li>
|
||
<li>
|
||
<p>Google the error message for mailing list hits</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Successful port reports:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>v3.18: <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/issues/39#issuecomment-438525481" class="bare">https://github.com/cirosantilli/linux-kernel-module-cheat/issues/39#issuecomment-438525481</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="update-the-linux-kernel-lkmc-procedure.html">Update the Linux kernel LKMC procedure</a> | ↑ Up: <a href="kernel-version.html">Kernel version</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="kernel-command-line-parameters.html">Kernel command line parameters</a> →</p>
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