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--- en:c1_overclocking [2016/11/25 10:28]
joy.cho created
+++ en:c1_overclocking [2016/11/28 16:17]
joy.cho [The available list of cpu frequency set]
@@ Line 2: / Line 2: @@
 <WRAP center round important>
-  * Ubuntu : The version will be specified here.
+  * Ubuntu : The version should be 3.10.104-177 or higher version.
+  * Android : The version should be Android v3.4 (Nov 28,2016) or higher version.
 </WRAP>
+==== The available list of cpu frequency set ====
-==== Available set ====
+|  frequency  |  notation on boot.ini  |  clock spec.  |
+|  1.824 GHz  |  "1824"  |  overclock  |
+|  1.728 GHz  |  "1728"  |  overclock  |
+|  1.632 GHz  |  "1632"  |  overclock  |
+|  1.536 GHz  |  "1536"  |    spec in  |
+|  1.488 GHz  |  "1488"  |    spec in  |
+|  ...  |  ...  |  ...  |
+You can check the available frequency set with the following node.
+<code>
+# cat  /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequency
+192000 312000 408000 504000 600000 696000 816000 912000 1008000 1104000 1200000 1296000 1416000
+1488000 1536000 1632000 1728000 1824000
+</code>
+<WRAP left round tip 80%>
+In case of **Android**, we don't recommend **1.824GHz** cpu frequency on Android system so far\\
+because system booting and heavy load test with 1.824GHz is unstable currently.
+</WRAP>
 ==== Adjust CPU Max Frequency using boot.ini ====
+== How to Set boot.ini ==
+Please modify **max_freq** based on the aforementioned frequency table. The unit of max_freq in boot.ini in MHz.
+<code>
+### boot.ini
+# CPU Max Frequency
+# Possible Values: 96 192 312 408 504 600 720 816
+# 1008 1200 1320 1488 1536 1632 1728 and 1824
+# setenv max_freq "1488"
+# setenv max_freq "1536"
+# setenv max_freq "1632"
+# setenv max_freq "1728"
+# setenv max_freq "1824"
+setenv max_freq "1536"
+# Boot Arguments
+setenv bootargs "root=UUID=e139ce78-9841-40fe-8823-96a304a09859 rootwait ro ${condev} no_console_suspend vdaccfg=0xa000 logo=osd1,loaded,0x7900000,720p,full dmfc=3
+cvbsmode=576cvbs hdmimode=${m} m_bpp=${m_bpp} vout=${vout_mode} ${disableuhs} ${hdmi_hpd} ${hdmi_cec} ${enabledac} monitor_onoff=${monitor_onoff} max_freq=${max_freq}"
+</code>
+== How to Check new max cpu frequency ==
+You can check if the current max cpu frequency via the below node.
+<code>
+# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
+1824000
+</code>
+The node **cpuinfo_cur_freq** shows the cpu frequency that is currently working. \\
+Please note governor policy should be **performance** if you want to check the max cpu frequency and run max cpu frequency unconditionally.
+<code>
+# echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
+# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
+performance
+# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
+1824000
+</code>