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<h1 class="header-title text-uppercase">Design Flow</h1>
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<!-- -*- Mode: rst -*- -->
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<!-- URLs that changes between the various backends. -->
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<div class="section" id="printable-version-of-this-document">
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<h2><a class="toc-backref" href="#id2">Printable Version of this Document</a></h2>
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<p><a class="reference external" href="../pdfs/DesignFlow.pdf">DesignFlow</a>.</p>
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<div class="contents topic" id="contents">
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<p class="topic-title">Contents</p>
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<ul class="simple">
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<li><a class="reference internal" href="#printable-version-of-this-document" id="id2">Printable Version of this Document</a></li>
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<li><a class="reference internal" href="#introduction" id="id3">1. Introduction</a><ul>
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<li><a class="reference internal" href="#task-vs-rules" id="id4">1.1 Task vs. Rules</a></li>
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<li><a class="reference internal" href="#a-warning-about-determinism" id="id5">1.2 A Warning About Determinism</a></li>
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</ul>
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</li>
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<li><a class="reference internal" href="#using-the-design-flow" id="id6">2. Using The Design Flow</a><ul>
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<li><a class="reference internal" href="#locating-the-various-parts" id="id7">2.1 Locating the Various Parts</a></li>
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<li><a class="reference internal" href="#basic-example-of-dodo-file" id="id8">2.2 Basic Example of <span class="cb">dodo</span> File</a></li>
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</ul>
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</li>
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<li><a class="reference internal" href="#rules-s-catalog" id="id9">3. Rules's Catalog</a><ul>
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<li><a class="reference internal" href="#alliance-legacy-tools" id="id10">3.1 Alliance Legacy Tools</a></li>
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<li><a class="reference internal" href="#current-tools" id="id11">3.2 Current Tools</a></li>
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<li><a class="reference internal" href="#utility-rules" id="id12">3.3 Utility Rules</a></li>
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<li><a class="reference internal" href="#rule-sets" id="id13">3.4 Rule Sets</a></li>
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</ul>
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</li>
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</ul>
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<!-- -*- Mode: rst; explicit-buffer-name: "definition.rst<documentation/etc>" -*- -->
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<!-- HTML/LaTeX backends mixed macros. -->
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<!-- Acronyms & names. -->
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<!-- URLs -->
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<!-- Standard CAO/VLSI Concepts. -->
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<!-- Alliance & MBK Concepts -->
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<!-- Hurricane Concepts. -->
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<!-- -*- Mode: rst -*- -->
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</div>
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<div class="section" id="introduction">
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<h2><a class="toc-backref" href="#id3">1. Introduction</a></h2>
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<p>The goal of the DesignFlow Python tool is to provide a replacement for
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Makefiles, especially the complex system that has been developped for
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alliance-check-toolkit. It is build upon <span class="sc">DoIt</span> (<a class="reference external" href="https://pydoit.org/contents.html">DoIt</a>).</p>
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<div class="section" id="task-vs-rules">
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<h3><a class="toc-backref" href="#id4">1.1 Task vs. Rules</a></h3>
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<p>Both as a tribute to <span class="cb">Makefile</span>, to avoid ambiguties with <span class="sc">DoIt</span> and to remember
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that they are task <em>generators</em>, the classes defined to create tasks for the design
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flow are called <tt class="docutils literal">rules</tt>.</p>
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</div>
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<div class="section" id="a-warning-about-determinism">
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<h3><a class="toc-backref" href="#id5">1.2 A Warning About Determinism</a></h3>
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<p>There is a very important execution difference from a <span class="cb">Makefile</span>. In a
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<span class="cb">Makefile</span> each rule command is executed in a a separated process, so
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information is effectively passed through files which are written then read
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from disk. But in <span class="sc">DoIt</span> we are running inside <em>one</em> <span class="sc">Python</span> process, so while
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using Coriolis and the <span class="sc">Hurricane</span> database, all informations stays <em>in
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memory</em>. Files are driven, but <em>not re-read</em> as the database will use the datas
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already present in memory.</p>
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<p>This is not whitout consequences about determism. Let's look at two different
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scenarii.</p>
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<ol class="arabic">
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<li><p class="first">We run straight from the RTL to the layout, using the rule/task sequence:</p>
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<pre class="literal-block">
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Yosys => design.blif => blif2vst => design.vst => PnR => design.gds
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</pre>
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<p>In this case, while <tt class="docutils literal">design.vst</tt> is written on disk, the <tt class="docutils literal">PnR</tt> stage
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will not re-read the <tt class="docutils literal">vst</tt> file and directly access the data in memory.</p>
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</li>
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<li><p class="first">Run in two separated steps, first we create the <tt class="docutils literal">vst</tt> file:</p>
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<pre class="literal-block">
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Yosys => design.blif => blif2vst => design.vst
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</pre>
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<p>Then, we perform the <tt class="docutils literal">PnR</tt>:</p>
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<pre class="literal-block">
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design.vst => PnR => design.gds
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</pre>
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<p>In this case, as the <span class="sc">DoIt</span> processess has been restarted between the two
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tasks, the <tt class="docutils literal">PnR</tt> stage <em>will</em> read the <tt class="docutils literal">vst</tt> file.</p>
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</li>
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</ol>
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<p>The determism in <span class="sc">Coriolis</span> is ensured through the unique identifiers of the
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objects, attributed in creation order. So between thoses two scenarii, the
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identifiers will change and so the algorithm results. The differences should
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be minor as the identifiers are used as a <em>last ditch</em> test to sort between
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two objects which cost functions are exactly equal, nevertheless, it will
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occur.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last"><span class="sc">Coriolis</span> is deterministic, meaning that each scenario will always
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give the same result. The difference is truly <em>between</em> scenarii.</p>
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</div>
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</div>
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</div>
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<div class="section" id="using-the-design-flow">
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<h2><a class="toc-backref" href="#id6">2. Using The Design Flow</a></h2>
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<div class="section" id="locating-the-various-parts">
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<h3><a class="toc-backref" href="#id7">2.1 Locating the Various Parts</a></h3>
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<p>One of the most tricky part of setting up the design flow is to locate where
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the various components are. The script needs to be able to find:</p>
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<ol class="arabic">
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<li><p class="first">Coriolis, binaries & libraries. This depends widely of your kind of
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installation and system. The helper script <tt class="docutils literal">crlenv.py</tt> supplied
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both in <tt class="docutils literal"><span class="pre">alliance-check-toolkit</span></tt> and <span class="sc">Coriolis</span> may help you there.
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It looks in all the standard locations (that it is aware of) to try
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to find it.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">Usually, <span class="sc">Alliance</span> is installed in the same tree as
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<span class="sc">Coriolis</span>, so it's setup can be deduced from it.</p>
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</div>
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</li>
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<li><p class="first">The configurations files for the technology to be used. Here again,
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the <tt class="docutils literal">designflow.technos</tt> module provides you with a set of
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pre-defined configurations for open sources technologie shipped
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with <span class="sc">Coriolis</span>. For unsupported ones, you may write your own,
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it should perform the whole initialization of the <span class="sc">Coriolis</span> and
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<span class="sc">Hurricane</span> database.</p>
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</li>
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<li><p class="first">Optionnaly the <tt class="docutils literal"><span class="pre">alliance-check-toolkit</span></tt>.</p>
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</li>
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</ol>
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</div>
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<div class="section" id="basic-example-of-dodo-file">
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<h3><a class="toc-backref" href="#id8">2.2 Basic Example of <span class="cb">dodo</span> File</a></h3>
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<p>This example can be found in <tt class="docutils literal"><span class="pre">alliance-check-toolkit</span></tt>, under <tt class="docutils literal">benchs/arlet6502/sky130_c4m</tt>.</p>
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<pre class="code Python literal-block">
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<span class="kn">from</span> <span class="nn">designflow.technos</span> <span class="kn">import</span> <span class="n">setupSky130_c4m</span>
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<span class="n">setupSky130_c4m</span><span class="p">(</span> <span class="n">checkToolkit</span><span class="o">=</span><span class="s1">'../../..'</span>
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<span class="p">,</span> <span class="n">pdkMasterTop</span><span class="o">=</span><span class="s1">'../../../pdkmaster/C4M.Sky130'</span> <span class="p">)</span>
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<span class="n">DOIT_CONFIG</span> <span class="o">=</span> <span class="p">{</span> <span class="s1">'verbosity'</span> <span class="p">:</span> <span class="mi">2</span> <span class="p">}</span>
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<span class="kn">from</span> <span class="nn">designflow.pnr</span> <span class="kn">import</span> <span class="n">PnR</span>
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<span class="kn">from</span> <span class="nn">designflow.yosys</span> <span class="kn">import</span> <span class="n">Yosys</span>
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<span class="kn">from</span> <span class="nn">designflow.blif2vst</span> <span class="kn">import</span> <span class="n">Blif2Vst</span>
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<span class="kn">from</span> <span class="nn">designflow.alias</span> <span class="kn">import</span> <span class="n">Alias</span>
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<span class="kn">from</span> <span class="nn">designflow.clean</span> <span class="kn">import</span> <span class="n">Clean</span>
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<span class="n">PnR</span><span class="o">.</span><span class="n">textMode</span> <span class="o">=</span> <span class="kc">True</span>
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<span class="kn">from</span> <span class="nn">doDesign</span> <span class="kn">import</span> <span class="n">scriptMain</span>
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<span class="n">ruleYosys</span> <span class="o">=</span> <span class="n">Yosys</span> <span class="o">.</span><span class="n">mkRule</span><span class="p">(</span> <span class="s1">'yosys'</span><span class="p">,</span> <span class="s1">'Arlet6502.v'</span> <span class="p">)</span>
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<span class="n">ruleB2V</span> <span class="o">=</span> <span class="n">Blif2Vst</span><span class="o">.</span><span class="n">mkRule</span><span class="p">(</span> <span class="s1">'b2v'</span> <span class="p">,</span> <span class="p">[</span> <span class="s1">'arlet6502.vst'</span>
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<span class="p">,</span> <span class="s1">'Arlet6502.spi'</span> <span class="p">]</span>
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<span class="p">,</span> <span class="p">[</span><span class="n">ruleYosys</span><span class="p">]</span>
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<span class="p">,</span> <span class="n">flags</span><span class="o">=</span><span class="mi">0</span> <span class="p">)</span>
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<span class="n">rulePnR</span> <span class="o">=</span> <span class="n">PnR</span> <span class="o">.</span><span class="n">mkRule</span><span class="p">(</span> <span class="s1">'pnr'</span> <span class="p">,</span> <span class="p">[</span> <span class="s1">'arlet6502_cts_r.gds'</span>
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<span class="p">,</span> <span class="s1">'arlet6502_cts_r.spi'</span>
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<span class="p">,</span> <span class="s1">'arlet6502_cts_r.vst'</span> <span class="p">]</span>
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<span class="p">,</span> <span class="p">[</span><span class="n">ruleB2V</span><span class="p">]</span>
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<span class="p">,</span> <span class="n">scriptMain</span> <span class="p">)</span>
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<span class="n">ruleCgt</span> <span class="o">=</span> <span class="n">PnR</span> <span class="o">.</span><span class="n">mkRule</span><span class="p">(</span> <span class="s1">'cgt'</span> <span class="p">)</span>
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<span class="n">ruleGds</span> <span class="o">=</span> <span class="n">Alias</span> <span class="o">.</span><span class="n">mkRule</span><span class="p">(</span> <span class="s1">'gds'</span><span class="p">,</span> <span class="p">[</span><span class="n">rulePnR</span><span class="p">]</span> <span class="p">)</span>
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<span class="n">ruleClean</span> <span class="o">=</span> <span class="n">Clean</span> <span class="o">.</span><span class="n">mkRule</span><span class="p">()</span>
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</pre>
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<p>You can run it with:</p>
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<pre class="code bash literal-block">
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ego@home:sky130_c4m> ../../../bin/crlenv.py -- doit list
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b2v Run <blif2vst arlet6502 <span class="nv">depends</span><span class="o">=[</span>Arlet6502.blif<span class="o">]</span>>.
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cgt Run plain CGT <span class="o">(</span>no loaded design<span class="o">)</span>
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clean_flow Clean all generated <span class="o">(</span>targets<span class="o">)</span> files.
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gds Run <Alias <span class="s2">"gds"</span> <span class="k">for</span> <span class="s2">"pnr"</span>>.
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pnr Run <pnr arlet6502_cts_r.gds <span class="nv">depends</span><span class="o">=[</span>arlet6502.vst,Arlet6502.spi<span class="o">]</span>>.
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yosys Run <yosys Arlet6502.v <span class="nv">top</span><span class="o">=</span>Arlet6502 <span class="nv">blackboxes</span><span class="o">=[]</span> <span class="nv">flattens</span><span class="o">=[]</span>>.
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ego@home:sky130_c4m> ../../../bin/crlenv.py -- doit pnr
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ego@home:sky130_c4m> ../../../bin/crlenv.py -- doit clean_flow
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</pre>
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<p>Let's have a detailed look on the various parts of the script.</p>
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<ol class="upperalpha">
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<li><p class="first"><strong>Choosing the technology</strong> Here, we load the predefined configuration for
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SkyWater 130nm. We also have to give the location of the
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<tt class="docutils literal"><span class="pre">alliance-check-toolkit</span></tt>, it may be relative or absolute.</p>
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<p>If you want to use another one, it up to you to configure <span class="sc">Coriolis</span> at
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this point by any means you see fit.</p>
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<pre class="code Python literal-block">
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<span class="kn">from</span> <span class="nn">designflow.technos</span> <span class="kn">import</span> <span class="n">setupSky130_c4m</span>
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<span class="n">setupSky130_c4m</span><span class="p">(</span> <span class="n">checkToolkit</span><span class="o">=</span><span class="s1">'../../..'</span>
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<span class="p">,</span> <span class="n">pdkMasterTop</span><span class="o">=</span><span class="s1">'../../../pdkmaster/C4M.Sky130'</span> <span class="p">)</span>
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</pre>
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</li>
|
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<li><p class="first"><strong>Loading the various task/rule generators that we will use</strong>, from the
|
|
<tt class="docutils literal">designflow</tt> namespace. The rules are named from the tool they
|
|
encapsulate.</p>
|
|
<pre class="code Python literal-block">
|
|
<span class="kn">from</span> <span class="nn">designflow.pnr</span> <span class="kn">import</span> <span class="n">PnR</span>
|
|
<span class="kn">from</span> <span class="nn">designflow.yosys</span> <span class="kn">import</span> <span class="n">Yosys</span>
|
|
<span class="kn">from</span> <span class="nn">designflow.blif2vst</span> <span class="kn">import</span> <span class="n">Blif2Vst</span>
|
|
<span class="kn">from</span> <span class="nn">designflow.alias</span> <span class="kn">import</span> <span class="n">Alias</span>
|
|
<span class="kn">from</span> <span class="nn">designflow.clean</span> <span class="kn">import</span> <span class="n">Clean</span>
|
|
<span class="n">PnR</span><span class="o">.</span><span class="n">textMode</span> <span class="o">=</span> <span class="kc">True</span>
|
|
</pre>
|
|
</li>
|
|
<li><p class="first"><strong>Creating the rule set.</strong> Each rule generator as a static method <tt class="docutils literal">mkRule()</tt>
|
|
to create a new task. The three first parameters are always:</p>
|
|
<ol class="arabic simple">
|
|
<li>The name of the task (the <tt class="docutils literal">basename</tt> for <span class="sc">DoIt</span>).</li>
|
|
<li>A target or list of targets, must be files or <tt class="docutils literal">pathlib.Path</tt> objects.</li>
|
|
<li>A dependency or list of dependencies, they can be files, <tt class="docutils literal">pathlib.Path</tt>
|
|
objects, or other tasks. We can see that the <tt class="docutils literal">Blif2Vst</tt> rule uses
|
|
directly the <tt class="docutils literal">Yosys</tt> one (the input file will be the <em>first</em> target
|
|
of the <tt class="docutils literal">Yosys</tt> rule).</li>
|
|
<li>Any extra parameters. A set of flag for <tt class="docutils literal">Blif2Vst</tt>. The <tt class="docutils literal">PnR</tt> rule takes
|
|
an optional callable argument, <em>any</em> callable. In this case we import the
|
|
<tt class="docutils literal">scriptMain()</tt> function from <tt class="docutils literal">doDesign()</tt>.</li>
|
|
</ol>
|
|
<p>There are two more special rules:</p>
|
|
<ul>
|
|
<li><p class="first"><tt class="docutils literal">Alias</tt>, to rename a rule. It this case <tt class="docutils literal">gds</tt> is defined as an alias to
|
|
<tt class="docutils literal">PnR</tt> (because it generate the <span class="sc">gds</span> file).</p>
|
|
</li>
|
|
<li><p class="first"><tt class="docutils literal">Clean</tt> to create a rule that will remove all the generated targets.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">The clean rule is named <tt class="docutils literal">clean_flow</tt> because <span class="sc">DoIt</span> already have
|
|
a <tt class="docutils literal">clean</tt> arguments which would shadow it.</p>
|
|
</div>
|
|
</li>
|
|
</ul>
|
|
<pre class="code Python literal-block">
|
|
<span class="n">PnR</span><span class="o">.</span><span class="n">textMode</span> <span class="o">=</span> <span class="kc">True</span>
|
|
|
|
<span class="kn">from</span> <span class="nn">doDesign</span> <span class="kn">import</span> <span class="n">scriptMain</span>
|
|
|
|
<span class="n">ruleYosys</span> <span class="o">=</span> <span class="n">Yosys</span> <span class="o">.</span><span class="n">mkRule</span><span class="p">(</span> <span class="s1">'yosys'</span><span class="p">,</span> <span class="s1">'Arlet6502.v'</span> <span class="p">)</span>
|
|
<span class="n">ruleB2V</span> <span class="o">=</span> <span class="n">Blif2Vst</span><span class="o">.</span><span class="n">mkRule</span><span class="p">(</span> <span class="s1">'b2v'</span> <span class="p">,</span> <span class="p">[</span> <span class="s1">'arlet6502.vst'</span>
|
|
<span class="p">,</span> <span class="s1">'Arlet6502.spi'</span> <span class="p">]</span>
|
|
<span class="p">,</span> <span class="p">[</span><span class="n">ruleYosys</span><span class="p">]</span>
|
|
<span class="p">,</span> <span class="n">flags</span><span class="o">=</span><span class="mi">0</span> <span class="p">)</span>
|
|
<span class="n">rulePnR</span> <span class="o">=</span> <span class="n">PnR</span> <span class="o">.</span><span class="n">mkRule</span><span class="p">(</span> <span class="s1">'pnr'</span> <span class="p">,</span> <span class="p">[</span> <span class="s1">'arlet6502_cts_r.gds'</span>
|
|
<span class="p">,</span> <span class="s1">'arlet6502_cts_r.spi'</span>
|
|
<span class="p">,</span> <span class="s1">'arlet6502_cts_r.vst'</span> <span class="p">]</span>
|
|
<span class="p">,</span> <span class="p">[</span><span class="n">ruleB2V</span><span class="p">]</span>
|
|
<span class="p">,</span> <span class="n">scriptMain</span> <span class="p">)</span>
|
|
<span class="n">ruleCgt</span> <span class="o">=</span> <span class="n">PnR</span> <span class="o">.</span><span class="n">mkRule</span><span class="p">(</span> <span class="s1">'cgt'</span> <span class="p">)</span>
|
|
<span class="n">ruleGds</span> <span class="o">=</span> <span class="n">Alias</span> <span class="o">.</span><span class="n">mkRule</span><span class="p">(</span> <span class="s1">'gds'</span><span class="p">,</span> <span class="p">[</span><span class="n">rulePnR</span><span class="p">]</span> <span class="p">)</span>
|
|
<span class="n">ruleClean</span> <span class="o">=</span> <span class="n">Clean</span> <span class="o">.</span><span class="n">mkRule</span><span class="p">()</span>
|
|
</pre>
|
|
</li>
|
|
</ol>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="rules-s-catalog">
|
|
<h2><a class="toc-backref" href="#id9">3. Rules's Catalog</a></h2>
|
|
<div class="section" id="alliance-legacy-tools">
|
|
<h3><a class="toc-backref" href="#id10">3.1 Alliance Legacy Tools</a></h3>
|
|
<p>Support for the <span class="sc">Alliance</span> legacy tools. They are run through sub-processes.
|
|
For more detailed documentation about those tools, refer to their <span class="cb">man</span> pages.</p>
|
|
<ol class="arabic simple">
|
|
<li><tt class="docutils literal">Asimut</tt>, <span class="sc">vhdl</span> simulator.</li>
|
|
<li><tt class="docutils literal">Boog</tt>, logical synthesys. Map a <span class="sc">vhdl</span> behavioral description to a standard
|
|
cell library (works with <tt class="docutils literal">boom</tt> & <tt class="docutils literal">loon</tt>).</li>
|
|
<li><tt class="docutils literal">Boom</tt>, behavioral description optimizer (works with <tt class="docutils literal">boog</tt> & <tt class="docutils literal">loon</tt>).</li>
|
|
<li><tt class="docutils literal">Cougar</tt>, symbolic layout extractor.</li>
|
|
<li><tt class="docutils literal">Dreal</tt>, real layout (<span class="sc">gds</span>, <span class="sc">cif</span>) editor.</li>
|
|
<li><tt class="docutils literal">Druc</tt>, symbolic layout <span class="sc">DRC</span>.</li>
|
|
<li><tt class="docutils literal">Flatph</tt>, flatten a layout, fully or in part.</li>
|
|
<li><tt class="docutils literal">Genpat</tt>, pattern generator (for use with <tt class="docutils literal">Asimut</tt>).</li>
|
|
<li><tt class="docutils literal">Graal</tt>, symbolic layout editor.</li>
|
|
<li><tt class="docutils literal">Loon</tt>, netlist optimizer for surface and/or delay (works with <tt class="docutils literal">boom</tt> & <tt class="docutils literal">boog</tt>).</li>
|
|
<li><tt class="docutils literal">Lvx</tt>, netlist comparator (<em>Layout</em> <em>Versus</em> <em>Extracted</em>).</li>
|
|
<li><tt class="docutils literal">S2R</tt>, symbolic to real translator (to <span class="sc">gds</span> or <span class="sc">cif</span>).</li>
|
|
<li><tt class="docutils literal">Vasy</tt>, Alliance <span class="sc">vhdl</span> subset translator towards standard <span class="sc">vhdl</span> or <span class="sc">Verilog</span>.</li>
|
|
</ol>
|
|
</div>
|
|
<div class="section" id="current-tools">
|
|
<h3><a class="toc-backref" href="#id11">3.2 Current Tools</a></h3>
|
|
<ol class="arabic simple">
|
|
<li><tt class="docutils literal">Blif2Vst</tt>, translate a <span class="cb">blif</span> netlist (<span class="sc">Yosys</span> output) into the <span class="sc">Alliance</span>
|
|
netlist format <span class="cb">vst</span>. This is a <span class="sc">Python</span> script calling <span class="sc">Coriolis</span> directly
|
|
integrated inside the task.</li>
|
|
<li><tt class="docutils literal">PnR</tt>, maybe a bit of a misnomer. This is a caller to function that the user have
|
|
to write to perform the P&R as he sees fit for it's particular design.</li>
|
|
<li><tt class="docutils literal">Yosys</tt>, call the <span class="sc">Yosys</span> logical synthesyser. Provide an off the shelf subset
|
|
of functionalities to perform classic use cases.</li>
|
|
</ol>
|
|
</div>
|
|
<div class="section" id="utility-rules">
|
|
<h3><a class="toc-backref" href="#id12">3.3 Utility Rules</a></h3>
|
|
<ol class="arabic">
|
|
<li><p class="first"><tt class="docutils literal">Alias</tt>, create a name alias for a rule.</p>
|
|
</li>
|
|
<li><p class="first"><tt class="docutils literal">Clean</tt>, remove all the generated targets of all the rules. The name of the
|
|
rule is <tt class="docutils literal">clean_flow` to not interfer with the |DoIt| clean arguments.
|
|
Files not part of any rules targets can be added to be removeds. Then,
|
|
to actually remove them, add the <span class="pre">``--extras</span></tt> flag to the command line.</p>
|
|
<pre class="code bash literal-block">
|
|
ego@home:sky130_c4m> ../../../bin/crlenv.py -- doit clean_flow --extras
|
|
</pre>
|
|
</li>
|
|
<li><p class="first"><tt class="docutils literal">Copy</tt>, copy a file into the current directory.</p>
|
|
</li>
|
|
</ol>
|
|
</div>
|
|
<div class="section" id="rule-sets">
|
|
<h3><a class="toc-backref" href="#id13">3.4 Rule Sets</a></h3>
|
|
<ol class="arabic simple">
|
|
<li>alliancesynth</li>
|
|
<li>pnrcheck</li>
|
|
<li>routecheck</li>
|
|
</ol>
|
|
</div>
|
|
</div>
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<!-- /Content -->
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<!-- Footer -->
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<div class="footer-title">Links</div>
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<ul class="list-unstyled">
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<li><a href="https://coriolis.lip6.fr/" target="_blank">Alliance/Coriolis</a></li>
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