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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/15493#discussion_r528402072">makefiles/tools/riotboot_serial.inc.mk</a>:</p>
<pre style='color:#555'>> @@ -0,0 +1,13 @@
+RIOTBOOT_SERIAL := $(RIOTTOOLS)/riotboot_serial/riotboot_serial
+
+FLASHER   ?= $(RIOTBOOT_SERIAL)
+FLASHFILE ?= $(HEXFILE)
+PROG_BAUD ?= 115200
</pre>
<p>You could just reuse BAUD instead of redefining a new variable.</p>

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