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<h1 id="firstHeading" class="firstHeading">Using GDB in-system debugger</h1>
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<h3 id="siteSub">From Milkymist Wiki</h3>
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<table id="toc" class="toc" summary="Contents"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1"><a href="index.php%3Ftitle=Using_GDB_in-system_debugger.html#Compiling_GDB"><span class="tocnumber">1</span> <span class="toctext">Compiling GDB</span></a></li>
<li class="toclevel-1"><a href="index.php%3Ftitle=Using_GDB_in-system_debugger.html#Obtaining_Flickernoise_debug_information"><span class="tocnumber">2</span> <span class="toctext">Obtaining Flickernoise debug information</span></a></li>
<li class="toclevel-1"><a href="index.php%3Ftitle=Using_GDB_in-system_debugger.html#Running_GDB"><span class="tocnumber">3</span> <span class="toctext">Running GDB</span></a></li>
<li class="toclevel-1"><a href="index.php%3Ftitle=Using_GDB_in-system_debugger.html#Connecting_to_the_target"><span class="tocnumber">4</span> <span class="toctext">Connecting to the target</span></a>
<ul>
<li class="toclevel-2"><a href="index.php%3Ftitle=Using_GDB_in-system_debugger.html#Directly"><span class="tocnumber">4.1</span> <span class="toctext">Directly</span></a></li>
<li class="toclevel-2"><a href="index.php%3Ftitle=Using_GDB_in-system_debugger.html#With_flterm_pass-through"><span class="tocnumber">4.2</span> <span class="toctext">With flterm pass-through</span></a></li>
<li class="toclevel-2"><a href="index.php%3Ftitle=Using_GDB_in-system_debugger.html#Over_JTAG"><span class="tocnumber">4.3</span> <span class="toctext">Over JTAG</span></a></li>
<li class="toclevel-2"><a href="index.php%3Ftitle=Using_GDB_in-system_debugger.html#Tips"><span class="tocnumber">4.4</span> <span class="toctext">Tips</span></a></li>
</ul>
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<li class="toclevel-1"><a href="index.php%3Ftitle=Using_GDB_in-system_debugger.html#GDB_commands"><span class="tocnumber">5</span> <span class="toctext">GDB commands</span></a></li>
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<a name="Compiling_GDB" id="Compiling_GDB"></a><h1><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=Using_GDB_in-system_debugger&amp;action=edit&amp;section=1" title="Edit section: Compiling GDB">edit</a>]</span> <span class="mw-headline"> Compiling GDB </span></h1>
<p>A <a href="http://sourceware.org/ml/gdb-patches/2011-04/msg00066.html" class="external text" title="http://sourceware.org/ml/gdb-patches/2011-04/msg00066.html" rel="nofollow">patch</a> is needed to make direct serial connections work. It was merged in GDB 7.3.
Compile GDB with the target <code>lm32-rtems4.11</code>.
Those steps should be included in the <a href="https://github.com/milkymist/scripts" class="external text" title="https://github.com/milkymist/scripts" rel="nofollow">build scripts</a>.
</p>
<a name="Obtaining_Flickernoise_debug_information" id="Obtaining_Flickernoise_debug_information"></a><h1><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=Using_GDB_in-system_debugger&amp;action=edit&amp;section=2" title="Edit section: Obtaining Flickernoise debug information">edit</a>]</span> <span class="mw-headline"> Obtaining Flickernoise debug information </span></h1>
<p>When building Flickernoise, the file <code>bin/flickernoise.elf</code> contains the debug information. Starting with Flickernoise 1.0RC1, this file is provided with the releases to make debugging easier. With
earlier versions, you have to compile Flickernoise yourself (the <a href="https://github.com/milkymist/scripts" class="external text" title="https://github.com/milkymist/scripts" rel="nofollow">build scripts</a> automate that).
</p><p><b>Make sure the <code>.elf</code> file and the code that the M1 is running are in sync!</b> If in doubt, <a href="http://www.milkymist.org/socdoc/bios.pdf" class="external text" title="http://www.milkymist.org/socdoc/bios.pdf" rel="nofollow">netboot</a> the binary that was just built.
</p>
<a name="Running_GDB" id="Running_GDB"></a><h1><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=Using_GDB_in-system_debugger&amp;action=edit&amp;section=3" title="Edit section: Running GDB">edit</a>]</span> <span class="mw-headline"> Running GDB </span></h1>
<pre>lm32-rtems4.11-gdb flickernoise.elf
</pre>
<a name="Connecting_to_the_target" id="Connecting_to_the_target"></a><h1><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=Using_GDB_in-system_debugger&amp;action=edit&amp;section=4" title="Edit section: Connecting to the target">edit</a>]</span> <span class="mw-headline"> Connecting to the target </span></h1>
<a name="Directly" id="Directly"></a><h2><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=Using_GDB_in-system_debugger&amp;action=edit&amp;section=5" title="Edit section: Directly">edit</a>]</span> <span class="mw-headline"> Directly </span></h2>
<p>Use these commands in GDB:
</p>
<pre>set remote interrupt-on-connect on
set remote interrupt-sequence BREAK
target remote /dev/ttyUSB0
</pre>
<a name="With_flterm_pass-through" id="With_flterm_pass-through"></a><h2><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=Using_GDB_in-system_debugger&amp;action=edit&amp;section=6" title="Edit section: With flterm pass-through">edit</a>]</span> <span class="mw-headline"> With flterm pass-through </span></h2>
<p>To use it start flterm with --gdb-passthrough. Then start gdb and run the following commands:
</p>
<pre>set remote interrupt-on-connect on
target remote &lt;pseudo terminal printed by flterm&gt;
</pre>
<p>Note: there is _no_ 'set remote interrupt-sequence BREAK'. flterm takes
care of converting Ctrl+C (ETX) to a BREAK.
</p>
<a name="Over_JTAG" id="Over_JTAG"></a><h2><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=Using_GDB_in-system_debugger&amp;action=edit&amp;section=7" title="Edit section: Over JTAG">edit</a>]</span> <span class="mw-headline"> Over JTAG </span></h2>
<p>With <a href="http://git.serverraum.org/?p=mw/openocd-lm32.git;a=summary" class="external text" title="http://git.serverraum.org/?p=mw/openocd-lm32.git;a=summary" rel="nofollow">OpenOCD</a>.Does not work reliably yet.
</p>
<a name="Tips" id="Tips"></a><h2><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=Using_GDB_in-system_debugger&amp;action=edit&amp;section=8" title="Edit section: Tips">edit</a>]</span> <span class="mw-headline"> Tips </span></h2>
<p>To track down GDB connection problems:
</p>
<pre>set debug remote 1
</pre>
<a name="GDB_commands" id="GDB_commands"></a><h1><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=Using_GDB_in-system_debugger&amp;action=edit&amp;section=9" title="Edit section: GDB commands">edit</a>]</span> <span class="mw-headline"> GDB commands </span></h1>
<p>When reporting a freeze, include at least the output from the <code>backtrace</code> command that gives a stack trace.
</p>
<ul><li> <a href="http://linux.bytesex.org/gdb.html" class="external text" title="http://linux.bytesex.org/gdb.html" rel="nofollow">GDB mini intro</a>
</li></ul>
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