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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11317#discussion_r275530369">cpu/sam0_common/periph/rtc.c</a>:</p>
<pre style='color:#555'>> @@ -41,13 +43,45 @@ static rtc_state_t rtc_callback;
 * Thanks to this, the user will be able to set time in 2000's*/
 static uint16_t reference_year = 100;
 
-void rtc_init(void)
+static void _wait_syncbusy(void)
+{
+#ifdef REG_RTC_MODE2_SYNCBUSY
+    while (RTC->MODE2.SYNCBUSY.reg);
</pre>
<p>alright!</p>

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