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Viktor Reusch
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<div class="headertitle"><div class="title">RTC driver </div></div>
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<div class="textblock"><p><a class="anchor" id="md_pkg_2rtc_2doc_2usage"></a></p>
<p>The RTC driver can drive various real-time clocks and provides an interface for other components, e.g., uvmm, to read and write the time.</p>
<p>It needs access to the hardware, depending on the clock, either via a vbus or via an I2C device.</p>
<h1>Command Line Options</h1>
<p>There are no command line options.</p>
<h1>Environment</h1>
<p>Several capabilities can be used to interact with the environment:</p>
<ul>
<li><p class="startli">'rtc' (server)</p>
<p class="startli">The capability with which clients talk to the service. Note that writing to the RTC is only possible when having the rtc capability with write rights, read-only clients must have the capability with read rights only.</p>
</li>
<li><p class="startli">'vbus'</p>
<p class="startli">The vbus used to access hardware for port-based clock on X86 and pl031 on arm.</p>
<p class="startli">The vbus is also needed for receiving the inhibitor signal from IO. </p>
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