<p><a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="455650133" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/11689" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/11689/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/11689">#11689</a> should only be needed if the RTC was buggy before.</p>
<p>I'm unsure what do to about saml21. Should I just drop <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/RIOT-OS/RIOT/commit/0507318e21fd64569c86a695eea3112027cf6d26/hovercard" href="https://github.com/RIOT-OS/RIOT/commit/0507318e21fd64569c86a695eea3112027cf6d26"><tt>0507318</tt></a> or should I add a comment to the Makefile that the Low Power SRAM is <strong>not</strong> retained in Backup mode? That'd make me re-think the interface specification if already half the platforms that initially support it don't implement it properly.</p>

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