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→The method to use RTC
</li>
<li><p>See the command of the RTC information through the ProcFS interface of the Linux system</p>
{| class="wikitable" style="width:800px;"
|-
|
<p>orangepi@orangepi:~$ '''cat /proc/driver/rtc'''</p>
<p>rtc_time : 06:07:40</p>
<p>periodic IRQ frequency : 1</p>
<p>max user IRQ frequency : 64</p>
<p>24hr : yes</p>|}</li></ol>
<span id="how-to-use-the-cooling-pwm-fan"></span>
== How to use the cooling PWM fan ==