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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/13909#discussion_r420067208">boards/common/stm32/include/cfg_rtt_default.h</a>:</p>
<pre style='color:#555'>> @@ -31,8 +31,17 @@ extern "C" {
  * On the STM32Lx platforms, we always utilize the LPTIM1.
  * @{
  */
-#define RTT_FREQUENCY       (1024U)             /* 32768 / 2^n */
-#define RTT_MAX_VALUE       (0x0000ffff)        /* 16-bit timer */
+#ifdef LPTIM1
</pre>
<p>Why is this needed ?</p>

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