https://wiki.radxa.com/mw/index.php?action=history&feed=atom&title=Rockpi4%2Fhardware%2Fcpu 2026-06-14T02:33:39Z Revision history for this page on the wiki MediaWiki 1.23.3 https://wiki.radxa.com/mw/index.php?title=Rockpi4/hardware/cpu&diff=6632&oldid=prev 2021-10-13T10:30:23Z

<p>Created page with &quot;{{rockpi4_header}} {{Languages|rockpi4/hardware/cpu}} __NOTOC__ <a href="/Rockpi4" title="Rockpi4"> ROCK Pi 4</a> &gt; <a href="/Rockpi4/hardware" class="mw-redirect" title="Rockpi4/hardware"> Hardware</a> &gt; <a href="/Rockpi4/hardware/cpu" title="Rockpi4/hardware/cpu"> CPU</a> RK3399 has 6...&quot;</p> <p><b>New page</b></p><div>{{rockpi4_header}}<br /> {{Languages|rockpi4/hardware/cpu}}<br /> <br /> __NOTOC__<br /> <br /> [[rockpi4 | ROCK Pi 4]] &gt; [[rockpi4/hardware | Hardware]] &gt; [[rockpi4/hardware/cpu | CPU]]<br /> <br /> RK3399 has 6 CPU core, 2 big core A72, 4 little core A53. In Linux, CPU0 to CPU3 are little core, CPU5&amp;6 are big cores.<br /> <br /> === check cpu[0-3] supported frequency ===<br /> <br /> # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies<br /> 408000 600000 816000 1008000 1200000 1416000<br /> <br /> === check cpu[4-5] supported frequency ===<br /> <br /> # cat /sys/devices/system/cpu/cpu5/cpufreq/scaling_available_frequencies<br /> 408000 600000 816000 1008000 1200000 1416000 1608000 1800000<br /> <br /> === check cpu[0-3] current frequency ===<br /> <br /> # cat /sys/devices/system/cpu/cpu[0123]/cpufreq/cpuinfo_cur_freq<br /> 1416000<br /> 1416000<br /> 1416000<br /> 1416000<br /> <br /> === set cpu[4-5] max frequency ===<br /> # echo 1008000 &gt; /sys/devices/system/cpu/cpu4/cpufreq/scaling_max_freq<br /> # echo 1008000 &gt; /sys/devices/system/cpu/cpu5/cpufreq/scaling_max_freq<br /> <br /> === turn off the big cores ===<br /> <br /> # echo 0 &gt; /sys/devices/system/cpu/cpu4/online<br /> # echo 0 &gt; /sys/devices/system/cpu/cpu5/online</div>

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