<p></p>
<h4>Description</h4>
<p>esp8266 hangs when the esp_wifi module is built in and one attempts to format a spiffs on mtd0.</p>
<p>I'm using the ESP12x board (in my case the <a href="https://www.adafruit.com/product/2471" rel="nofollow">Adafruit Huzzah breakout board</a> without anything connected to it other than the UART).</p>

<h4>Steps to reproduce the issue</h4>
<ol>
<li>
<p>Download <code>xtensa-esp8266-elf-gcc</code> and make it available in your PATH</p>
</li>
<li>
<p>Download <a href="https://github.com/gschorcht/RIOT-Xtensa-ESP8266-RTOS-SDK.git">ESP RTOS SDK</a> to <code>/opt/esp/ESP8266-RTOS-SDK</code></p>
</li>
<li>
<p>Compile the following example:</p>
</li>
<li>
<p>Connect with your favorite terminal. Check that the board is working (type <code>help</code> for example).</p>
</li>
<li>
<p>Run <code>format</code> (if it runs ok then rung <code>format</code> again).</p>
</li>
</ol>
<h4>Expected results</h4>
<h4>Actual results</h4>
<h4>Versions</h4>



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