openFPGALoader/guide/troubleshooting.html

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  <section id="troubleshooting">
<span id="id1"></span><h1>Troubleshooting<a class="headerlink" href="#troubleshooting" title="Link to this heading">¶</a></h1>
<section id="i-installed-openfpgaloader-but-it-says-command-not-found-when-i-try-to-launch-it">
<h2>I installed openFPGALoader but it says <cite>command not found</cite> when I try to launch it<a class="headerlink" href="#i-installed-openfpgaloader-but-it-says-command-not-found-when-i-try-to-launch-it" title="Link to this heading">¶</a></h2>
<p>The correct spelling of the program is <em>openFPGALoader</em> with FPGA and the “L” of “Loader” in uppercase.
Ensure the spelling of the program is correct.</p>
</section>
<section id="gowin-device-could-not-communicate-since-last-bitstream-flashed-issue-206">
<h2>Gowin device could not communicate since last bitstream flashed. (issue <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/issues/206">#206</a>)<a class="headerlink" href="#gowin-device-could-not-communicate-since-last-bitstream-flashed-issue-206" title="Link to this heading">¶</a></h2>
<p>Gowin’s FPGA may fails to be detected if <strong>JTAGSEL_N</strong> (pin 08 for <em>GW1N-4K</em>) is used as a GPIO.
To recover you have to pull down this pin (before power up) to recover JTAG interface (<em>UG292 - JTAGSELL_N section</em>).</p>
</section>
<section id="jtag-init-failed">
<h2>JTAG init failed<a class="headerlink" href="#jtag-init-failed" title="Link to this heading">¶</a></h2>
<p>Avoid using USB hubs and connect it directly to your PC USB port.</p>
</section>
<section id="tang-primer-20k-program-slow-and-stucked-issue-250">
<h2>Tang Primer 20k program slow and stucked (issue <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/issues/250">#250</a>)<a class="headerlink" href="#tang-primer-20k-program-slow-and-stucked-issue-250" title="Link to this heading">¶</a></h2>
<p>Check your openFPGALoader version:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>openFPGALoader<span class="w"> </span>-V
</pre></div>
</div>
<p>If it is older than release then v0.9.0, install the most recent version (from commit <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/commit/fe259fb78d185b3113661d04cd7efa9ae0232425">f5b89bff68a5e2147404a895c075773884077438</a> or later).</p>
</section>
<section id="cannot-flash-tang-nano-20k-issue-251">
<h2>Cannot flash Tang Nano 20k (issue <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/issues/511">#251</a>)<a class="headerlink" href="#cannot-flash-tang-nano-20k-issue-251" title="Link to this heading">¶</a></h2>
<p>Some firmware version cannot be flashed on Linux-based systems. Version 2024122312 is such an example. It seems this version was not published on the <a class="reference external" href="https://api.dl.sipeed.com/TANG/Debugger/onboard/BL616/">SiPeed website</a>, however some boards sold have this firmware.</p>
<p>The cause of the problem is the debugger on the Tang Nano, specifically the firmware of this debugger. This firmware can be easily updated by following <a class="reference external" href="https://wiki.sipeed.com/hardware/en/tang/common-doc/update_debugger.html">these</a> steps.</p>
</section>
<section id="cannot-flash-tang-nano-9k-issue-251">
<h2>Cannot flash Tang Nano 9k (issue <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/issues/251">#251</a>)<a class="headerlink" href="#cannot-flash-tang-nano-9k-issue-251" title="Link to this heading">¶</a></h2>
<p>This is a device issue, erase its Embedded Flash using Official GoWin Programmer (preferentially in Windows) and SRAM too, then you can use openFPGALoader again.</p>
</section>
<section id="unable-to-open-ftdi-device-4-usb-open-failed-issue-245">
<h2>Unable to open FTDI device: -4 (usb_open() failed) (issue <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/issues/245">#245</a>)<a class="headerlink" href="#unable-to-open-ftdi-device-4-usb-open-failed-issue-245" title="Link to this heading">¶</a></h2>
<p>Edit your <cite>/etc/udev/rules.d/99-ftdi.rules</cite> file exchanging your programming device permissions.</p>
<p>For more information, check the udev section from <a class="reference external" href="install.rst">this guide</a></p>
</section>
</section>


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<li class="toctree-l2"><a class="reference internal" href="#i-installed-openfpgaloader-but-it-says-command-not-found-when-i-try-to-launch-it">I installed openFPGALoader but it says <cite>command not found</cite> when I try to launch it</a></li>
<li class="toctree-l2"><a class="reference internal" href="#gowin-device-could-not-communicate-since-last-bitstream-flashed-issue-206">Gowin device could not communicate since last bitstream flashed. (issue #206)</a></li>
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+								  <section id="troubleshooting">
 								<span id="id1"></span><h1>Troubleshooting<a class="headerlink" href="#troubleshooting" title="Link to this heading">¶</a></h1>
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+								<section id="i-installed-openfpgaloader-but-it-says-command-not-found-when-i-try-to-launch-it">
 								<h2>I installed openFPGALoader but it says <cite>command not found</cite> when I try to launch it<a class="headerlink" href="#i-installed-openfpgaloader-but-it-says-command-not-found-when-i-try-to-launch-it" title="Link to this heading">¶</a></h2>
 								<p>The correct spelling of the program is <em>openFPGALoader</em> with FPGA and the “L” of “Loader” in uppercase.
 								Ensure the spelling of the program is correct.</p>
 								</section>
 								<section id="gowin-device-could-not-communicate-since-last-bitstream-flashed-issue-206">
 								<h2>Gowin device could not communicate since last bitstream flashed. (issue <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/issues/206">#206</a>)<a class="headerlink" href="#gowin-device-could-not-communicate-since-last-bitstream-flashed-issue-206" title="Link to this heading">¶</a></h2>
 								<p>Gowin’s FPGA may fails to be detected if <strong>JTAGSEL_N</strong> (pin 08 for <em>GW1N-4K</em>) is used as a GPIO.
 								To recover you have to pull down this pin (before power up) to recover JTAG interface (<em>UG292 - JTAGSELL_N section</em>).</p>
 								</section>
 								<section id="jtag-init-failed">
 								<h2>JTAG init failed<a class="headerlink" href="#jtag-init-failed" title="Link to this heading">¶</a></h2>
 								<p>Avoid using USB hubs and connect it directly to your PC USB port.</p>
 								</section>
 								<section id="tang-primer-20k-program-slow-and-stucked-issue-250">
 								<h2>Tang Primer 20k program slow and stucked (issue <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/issues/250">#250</a>)<a class="headerlink" href="#tang-primer-20k-program-slow-and-stucked-issue-250" title="Link to this heading">¶</a></h2>
 								<p>Check your openFPGALoader version:</p>
 								<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>openFPGALoader<span class="w"> </span>-V
 								</pre></div>
 								</div>
 								<p>If it is older than release then v0.9.0, install the most recent version (from commit <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/commit/fe259fb78d185b3113661d04cd7efa9ae0232425">f5b89bff68a5e2147404a895c075773884077438</a> or later).</p>
 								</section>
 								<section id="cannot-flash-tang-nano-20k-issue-251">
 								<h2>Cannot flash Tang Nano 20k (issue <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/issues/511">#251</a>)<a class="headerlink" href="#cannot-flash-tang-nano-20k-issue-251" title="Link to this heading">¶</a></h2>
 								<p>Some firmware version cannot be flashed on Linux-based systems. Version 2024122312 is such an example. It seems this version was not published on the <a class="reference external" href="https://api.dl.sipeed.com/TANG/Debugger/onboard/BL616/">SiPeed website</a>, however some boards sold have this firmware.</p>
 								<p>The cause of the problem is the debugger on the Tang Nano, specifically the firmware of this debugger. This firmware can be easily updated by following <a class="reference external" href="https://wiki.sipeed.com/hardware/en/tang/common-doc/update_debugger.html">these</a> steps.</p>
 								</section>
 								<section id="cannot-flash-tang-nano-9k-issue-251">
 								<h2>Cannot flash Tang Nano 9k (issue <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/issues/251">#251</a>)<a class="headerlink" href="#cannot-flash-tang-nano-9k-issue-251" title="Link to this heading">¶</a></h2>
 								<p>This is a device issue, erase its Embedded Flash using Official GoWin Programmer (preferentially in Windows) and SRAM too, then you can use openFPGALoader again.</p>
 								</section>
 								<section id="unable-to-open-ftdi-device-4-usb-open-failed-issue-245">
 								<h2>Unable to open FTDI device: -4 (usb_open() failed) (issue <a class="reference external" href="https://github.com/trabucayre/openFPGALoader/issues/245">#245</a>)<a class="headerlink" href="#unable-to-open-ftdi-device-4-usb-open-failed-issue-245" title="Link to this heading">¶</a></h2>
 								<p>Edit your <cite>/etc/udev/rules.d/99-ftdi.rules</cite> file exchanging your programming device permissions.</p>
 								<p>For more information, check the udev section from <a class="reference external" href="install.rst">this guide</a></p>
 								</section>
 								</section>
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+								<li class="toctree-l2"><a class="reference internal" href="#i-installed-openfpgaloader-but-it-says-command-not-found-when-i-try-to-launch-it">I installed openFPGALoader but it says <cite>command not found</cite> when I try to launch it</a></li>
 								<li class="toctree-l2"><a class="reference internal" href="#gowin-device-could-not-communicate-since-last-bitstream-flashed-issue-206">Gowin device could not communicate since last bitstream flashed. (issue #206)</a></li>
 								<li class="toctree-l2"><a class="reference internal" href="#jtag-init-failed">JTAG init failed</a></li>
 								<li class="toctree-l2"><a class="reference internal" href="#tang-primer-20k-program-slow-and-stucked-issue-250">Tang Primer 20k program slow and stucked (issue #250)</a></li>
 								<li class="toctree-l2"><a class="reference internal" href="#cannot-flash-tang-nano-20k-issue-251">Cannot flash Tang Nano 20k (issue #251)</a></li>
 								<li class="toctree-l2"><a class="reference internal" href="#cannot-flash-tang-nano-9k-issue-251">Cannot flash Tang Nano 9k (issue #251)</a></li>
 								<li class="toctree-l2"><a class="reference internal" href="#unable-to-open-ftdi-device-4-usb-open-failed-issue-245">Unable to open FTDI device: -4 (usb_open() failed) (issue #245)</a></li>
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 								<li class="toctree-l1"><a class="reference internal" href="advanced.html">Advanced usage of openFPGALoader</a></li>
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 								<p class="caption" role="heading"><span class="caption-text">Compatibility</span></p>
 								<ul>
 								<li class="toctree-l1"><a class="reference internal" href="../compatibility/fpga.html">FPGAs</a></li>
 								<li class="toctree-l1"><a class="reference internal" href="../compatibility/board.html">Boards</a></li>
 								<li class="toctree-l1"><a class="reference internal" href="../compatibility/cable.html">Cables</a></li>
 								</ul>
 								<p class="caption" role="heading"><span class="caption-text">Vendors</span></p>
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 								<li class="toctree-l1"><a class="reference internal" href="../vendors/anlogic.html">Anlogic notes</a></li>
 								<li class="toctree-l1"><a class="reference internal" href="../vendors/colognechip.html">Cologne Chip notes</a></li>
 								<li class="toctree-l1"><a class="reference internal" href="../vendors/efinix.html">Efinix notes</a></li>
 								<li class="toctree-l1"><a class="reference internal" href="../vendors/gowin.html">Gowin notes</a></li>
 								<li class="toctree-l1"><a class="reference internal" href="../vendors/intel.html">Intel notes</a></li>
 								<li class="toctree-l1"><a class="reference internal" href="../vendors/lattice.html">Lattice notes</a></li>
 								<li class="toctree-l1"><a class="reference internal" href="../vendors/xilinx.html">Xilinx notes</a></li>
 								</ul>
 								<p class="caption" role="heading"><span class="caption-text">Development</span></p>
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 								<li class="toctree-l1"><a class="reference internal" href="../todo.html">To Do</a></li>
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 								<h3>Related Topics</h3>
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 								  <li><a href="../index.html">Documentation overview</a><ul>
 								      <li>Previous: <a href="install.html" title="previous chapter">Installing openFPGALoader</a></li>
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 								</ul>
 								</div>
-												update 4d93073e991fbcffa4cff9916620101d09541b0d

											
										
										
											2026-02-12 17:26:28 +01:00
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-												deploy: 916af57d283b7e861dc721632e79a59abc1dd8b5

											
										
										
											2026-02-16 11:10:48 +01:00
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-												update 4d93073e991fbcffa4cff9916620101d09541b0d

											
										
										
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