<blockquote>
<p>Is tests/periph_rtc working for you?</p>
</blockquote>
<p>Yes on both SAME54-XPRO and SAML21-XPRO (only tested your branch but must be good on master too)</p>
<blockquote>
<p>I also have trouble flashing it with J-Link</p>
</blockquote>
<p>You're not using EDBG ? If you're stuck a quick <code>edbg -t atmel_cm0p -e</code> will save you.</p>

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