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

<p>I'll test it on hardware when everything will be addressed.</p><hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11655#discussion_r294651901">cpu/samd5x/cpu.c</a>:</p>
<pre style='color:#555'>>  
+    /* Without LBYPASS, startup takes very long, reson unknown. */
</pre>
<p>Reason is sillicon bug,<br>
check errata <a href="http://ww1.microchip.com/downloads/en/DeviceDoc/SAM-D5X-E5X-Family-Silicon-Errata-and-Data-Sheet-Clarification-80000748F.pdf" rel="nofollow">there</a>. section 2.13</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11655#discussion_r294652745">cpu/samd5x/cpu.c</a>:</p>
<pre style='color:#555'>>      OSCCTRL->Dpll[0].DPLLCTRLB.reg = OSCCTRL_DPLLCTRLB_REFCLK_GCLK
-                       | OSCCTRL_DPLLCTRLB_WUF
</pre>
<p>I would be better to not remove this regarding errata stuff.</p>

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