Howto Overclock your Odroid-C1

[mlinuxguy]

I will show you here how to overclock, it will require rebuilding the kernel
Note: at my current max speed of 1,728,000Hz I do not get an ethernet connection
until my /etc/rc.local script hits which cuts the max speed back down.
Once you have ethernet connection up you can switch back to max speed.

Update: To allow overclocked reboot with no need to change speeds in /etc/rc.local
You need to edit the DTS file as follows:

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# diff /usr/src/linux/arch/arm/boot/dts/meson8b_odroidc.dts /usr/src/linux/arch/arm/boot/dts/meson8b_odroidc.dts.orig
908c908
<                 reset_delay = <200>;
---
>                 reset_delay = <100>;

To overclock: edit this file first

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# diff usr/src/linux/arch/arm/mach-meson8b/clock.c.orig usr/src/linux/arch/arm/mach-meson8b/clock.c
63c63
< #define CPU_FREQ_LIMIT 1488000000
---
> #define CPU_FREQ_LIMIT 1728000000

Then change this include file:

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# diff usr/src/linux/arch/arm/mach-meson8b/include/mach/cpufreq_table.h.orig usr/src/linux/arch/arm/mach-meson8b/include/mach/cpufreq_table.h
22c22,25
<     {15       , CPUFREQ_TABLE_END},
---
>     {15       , 1536000  },
>     {16       , 1632000  },
>     {17       , 1728000  },
>     {18       , CPUFREQ_TABLE_END}, 

I did not see an easy way to set the default speed (it goes to max) so put this in /etc/rc.local

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echo 1536000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq

My current speed after getting a stable network connection

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# ./showfreq.sh
scaling max freq
1728000
cpuinfo max freq
1728000
cpuinfo cur freq
1728000
cpuinfo avail freq
96000 192000 312000 408000 504000 600000 696000 816000 912000 1008000 1104000 1200000 1296000 1416000 1488000 1536000 1632000 1728000

My temperature is:
# ./checktemp.sh
57

Now I run 30 seconds of heavy IPERF receive data on the Odroid-C1:
# ./checktemp.sh
59

I have a small heatsink on the CPU (smaller than the HK offering)

[odroid]

Very interesting but little bit scary.
Can you take a picture of your heat hink?

Edit: Thank you for the picture.
It looks really tiny.

[mlinuxguy]

I printed the case bottom and top on my 3d printer (Makerbot),
so I will have to re-design and reprint the top to fit the bigger heatsink I will put on it.

[Curmudgeon]

Is checktemp.sh available?

[mlinuxguy]

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# cat checktemp.sh
#!/bin/bash
cat /sys/class/thermal/thermal_zone0/temp

[newroad]

Do we still need to rebuild the kernel
or
we can overclock just by updating the above mentioned files.

[odroid]

The stock kernel has "1632000" and "1728000" options by default.

[wintersdark]

Is it possible to overclock the CPU on Android? I'm fine with the two speeds mentioned above, just want to edge a smidgeon more performance out of the C1.

[odroid]

The latest Android image has the overclocking option in the ODROID-Utility.

[antonica]

hi,
very good,
but is it hard to compile kernel? i have fear to loss my actual modules kernel

[repomanz]

Hi folks - is there a guide on how to do this for the C2?

[mlinuxguy]

Cannot be done for the C2 without Amlogic changing one of the binary blobs it boots from
Look for my "Exploring C2 clock speeds" --> http://forum.odroid.com/viewtopic.php?f=139&t=18738
Short answer is ARM trustzone controls the voltage/frequency tables from values set in the signed binary blob
Even if you were to hack it you would have to be able to sign the blob