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--- en:xu4_ram_overclock [2017/05/23 11:45]
joy.cho [Available list of devfreq governor and frequency]
+++ en:xu4_ram_overclock [2017/05/23 18:24] (current)
joy.cho [Ubuntu Guide]
@@ Line 2: / Line 2: @@
 A new higher DDR frequency is now available on XU4 series.\\
-So far, only **Android** supports the frequency set.\\
+Both of Android and Ubuntu supports the frequency set,\\
-Also you can adjust DDR frequency and governor using a new **ODROID Utility**.
+and only Android provides DRAM governor interface.\\
 <WRAP center round important>
@@ Line 10: / Line 10: @@
 </WRAP>
-===== Available list of devfreq governor and frequency =====
+===== Android Guide =====
+On Android, you can adjust DDR frequency and governor using a new **ODROID Utility**.
-== Governor ==
+=== Governor ===
 <code>
 # cat /sys/class/devfreq/exynos5-devfreq-mif/available_governors
@@ Line 18: / Line 19: @@
 </code>
-== Frequency ==
+=== Frequency ===
 <code>
 # cat /sys/class/devfreq/exynos5-devfreq-mif/available_frequencies
@@ Line 28: / Line 29: @@
 {{:en:screenshot_2017-05-17-05-27-49.png?nolink&800|}}
-==== AnTuTu Benchmark Score ====
+===== Ubuntu Guide =====
+On kernel 4.9, you can change ddr frequency using boot.ini interface.\\
+The available frequency set is **933MHz, 825MHz, 728MHz and 633MHz**\\
+and the default one is **825MHz**.\\
+As we check the benchmark score using **mbw**, about 10% improvement can be expected.
+=== boot.ini ===
+Please find **ddr_freq** in boot.ini and change the value.
+<code>
+...
+# DRAM Frequency
+# Sets the LPDDR3 memory frequency
+# Supported values: 933 825 728 633 (MHZ)
+setenv ddr_freq 825
+...
+# set DDR frequency
+dmc ${ddr_freq}
+...
+</code>
+And then please make sure to reboot the system.
+<code>
+# sudo reboot
+</code>
+===== AnTuTu Benchmark Score =====
 Here is a AnTuTu benchmark score.\\