<h1>OpenWrt Buildroot</h1>
</div>
- <p>Usage and documentation by Felix Fietkau, based on uClibc Buildroot
+ <p>Usage and documentation by Felix Fietkau and Waldemar Brodkorb, based on uClibc Buildroot
documentation by Thomas Petazzoni. Contributions from Karsten Kruse,
Ned Ludd, Martin Herren.</p>
<li>squashfs</li>
</ul>
<p><code>jffs2</code> contains a writable root filesystem, which will expand to
- the size of your flash image. Note that you if you use the generic firmware
- Image, you need to pick the right image for your Flash size, because of different
+ the size of your flash image. Note: if you use the generic firmware image, you
+ need to pick the right image for your flash size, because of different
eraseblock sizes.</p>
<p><code>squashfs</code> contains a read-only root filesystem using a modified
configuration, and the latter is used if you have selected
locale support.</li>
- <li>Run the compilation again</li>
+ <li>Run the compilation again.</li>
</ol>
<li><b>target</b> (in the <code>target</code> directory) contains the
Makefiles and associated files for software related to the generation of
- the target root filesystem image. Two types of filesystems are supported
+ the target root filesystem image and the linux kernel for the different
+ system on a chip boards, used in the Wireless Routers.
+ Two types of filesystems are supported
: jffs2 and squashfs.
</ul>
<li>Create the target directory (<code>build_ARCH/root/</code> by
default) and the target filesystem skeleton. This directory will contain
- the final root filesystem. To setup it up, it first deletes it, then it
+ the final root filesystem. To set it up, it first deletes it, then it
copies the skeleton available in <code>target/default/target_skeleton</code>
and then removes useless <code>CVS/</code> directories.</li>
<p>For example, you may add the following to your
<code>.bashrc</code> (considering you're building for the MIPS
architecture and that Buildroot is located in
- <code>~/buildroot/</code>) :</p>
+ <code>~/openwrt/</code>) :</p>
<pre>
-export PATH=$PATH:~/buildroot/staging_dir_mipsel/bin/
+export PATH=$PATH:~/openwrt/staging_dir_mipsel/bin/
</pre>
<p>Then you can simply do :</p>
downloaded by the <i>Makefiles</i> are all stored in the
<code>DL_DIR</code> which by default is the <code>dl</code>
directory. It's useful for example if you want to keep a complete
- version of Buildroot which is know to be working with the
+ version of Buildroot which is known to be working with the
associated tarballs. This will allow you to regenerate the
toolchain and the target filesystem with exactly the same
versions.</p>
<pre>
config BR2_PACKAGE_FOO
- tristate "foo"
- default n
+ tristate "foo - some nice tool"
+ default m if CONFIG_DEVEL
help
This is a comment that explains what foo is.
</pre>
+ <p>If you depend on other software or library inside the Buildroot, it
+ is important that you automatically select these packages in your
+ <code>Config.in</code>. Example if foo depends on bar library:
+ </p>
+<pre>
+config BR2_PACKAGE_FOO
+ tristate "foo - some nice tool"
+ default m if CONFIG_DEVEL
+ select BR2_PACKAGE_LIBBAR
+ help
+ This is a comment that explains what foo is.
+</pre>
+
<p>Of course, you can add other options to configure particular
things in your software.</p>
+ <h3><code>Config.in</code> in the package directory</h3>
+
+ <p>To add your package to the configuration tool, you need
+ to add the following line to <code>package/Config.in</code>,
+ please add it to a section, which fits the purpose of foo:
+
+<pre>
+comment "Networking"
+source "package/foo/Config.in"
+</pre>
+
<h3><code>Makefile</code> in the package directory</h3>
<p>To add your package to the build process, you need to edit
<p>As you can see, this short line simply adds the target
<code>foo</code> to the list of targets handled by OpenWrt Buildroot.</p>
-
- <p>In addition to the default dependencies, you make your package
- depend on another package (e.g. a library) by adding a line:
+ <p>In addition to the default dependencies, you make your package
+ depend on another package (e.g. a library) by adding a line:
<pre>
foo-compile: bar-compile
</pre>
- <h3>The <i>.control</i> file</h3>
+ <h3>The ipkg control file</h3>
<p>Additionally, you need to create a control file which contains
information about your package, readable by the <i>ipkg</i> package
- utility.</p>
+ utility. It should be created as file:
+ <code>package/foo/ipkg/foo.control</code></p>
<p>The file looks like this</p>
3 Section: net
4 Maintainer: Foo Software <foo@foosoftware.com>
5 Source: http://foosoftware.com
- 6 Description: Your Package Description
+ 6 Depends: libbar
+ 7 Description: Package Description
</pre>
<p>You can skip the usual <code>Version:</code> and <code>Architecture</code>
fields, as they will be generated by the <code>make-ipkg-dir.sh</code> script
- called from your Makefile</p>
+ called from your Makefile. The Depends field is important, so that ipkg will
+ automatically fetch all dependend software on your target system.</p>
<h3>The real <i>Makefile</i></h3>
4 PKG_VERSION:=1.0
5 PKG_RELEASE:=1
6 PKG_MD5SUM:=4584f226523776a3cdd2fb6f8212ba8d
- 7
8 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
9 PKG_SOURCE_URL:=http://www.foosoftware.org/downloads
10 PKG_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
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