<p></p>
<p><b>@benpicco</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/13146#discussion_r422086522">boards/nrf52840dongle/Makefile.include</a>:</p>
<pre style='color:#555'>> @@ -0,0 +1,27 @@
+# This board uses the vendor's serial bootloader
+
+PROGRAMMER ?= nrfutil
+
+ifeq (nrfutil,$(PROGRAMMER))
+
</pre>
<p>Sorry, drop that</p>
<div class="highlight highlight-source-makefile"><pre><span class="pl-k">ifeq</span> (,<span class="pl-s">$(<span class="pl-c1">filter</span> stdio_cdc_acm,<span class="pl-s">$(<span class="pl-smi">USEMODULE</span>)</span>)</span>)
  <span class="pl-c"><span class="pl-c">#</span> The arduino and nrfutil bootloader features cannot be used if the</span>
  <span class="pl-c"><span class="pl-c">#</span> stdio_cdc_acm module is not used</span>
  <span class="pl-smi">FEATURES_BLACKLIST</span> += bootloader_arduino
  <span class="pl-smi">FEATURES_BLACKLIST</span> += bootloader_nrfutil
<span class="pl-k">endif</span></pre></div>

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