Fill in out-of-tree modules

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-  <h1>Custom Linux kernel packages</h1>
+  <h1>Custom Linux kernel builds</h1>
+  <p>
+    The official packages work for most users, but not all:
+  </p>
+  <ul class="incremental">
+    <li>
+      Different ARM platforms need incompatible configurations,
+      and we cannot build them all
+    </li>
+    <li>
+      New features are not enabled immediately if we are worried
+      about potential regressions
+    </li>
+  </ul>
+  <p class="incremental">
+    Using either upstream source or Debian linux-source package:
+  </p>
+  <ul class="incremental">
+    <li>
+      <tt>make && make install</tt>
+    </li>
+    <li>
+      <tt>make deb-pkg</tt> - build packages
+    </li>
+    <li>
+      <tt>make-kpkg</tt> - build packages with more customisation;
+      requires kernel-package
+    </li>
+  </ul>

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   <h1>Out-of-tree modules</h1>
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   <h1>Out-of-tree modules</h1>

+  <p>
+    The kernel team does not encourage the use of out-of-tree modules.
+    However, we support them by providing development packages and by
+    avoiding ABI changes during a stable release.
+  </p>
+  <p class="incremental">
+    Debian has two packages to aid in building out-of-tree modules:
+  </p>
+  <ul class="incremental">
+    <li>
+      <tt>dkms</tt> - builds and installs modules automatically.  Can
+      build packages for installation on other systems.  Also
+      supported by Ubuntu and SUSE.
+    </li>
+    <li>
+      <tt>module-assistant</tt> - builds packages as directed.
+      Uses a separate package name for each kernel ABI.
+    </li>
+  </ul>

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