[Xperia Arc Android Development] viulian:
Update:

Use at your own risk, nothing is guaranteed!! Overclocking is dangerous and could brick your phone so be aware of what you are about to do!

If you want to take the risk, the files are below:

overclock_arc_ics_v1.zip

Install procedure:

1. The zip contains two files, overclock_12.ko and overclock_14.ko.

2. Unpack the two files onto your /sdcard folder

3. Insert one or the other using:

insmod /sdcard/overclock_1X.ko

where X is 2 or 4 depending on what frequency you want, 2 for 1200MHz or 4 for 1400MHz.

You can create a small script with the same contents and have Script Manager run it at boot time.

IMPORTANT: About frequency managers:

The CPU Managers are not perfect (I've tried SetCPU and No Frills).

They do not read the frequency tables from kernel - but as far as I can tell, they rely on the time_in_state file to see what frequencies are available. But if a frequency is changed, they remain disorientated.

THUS.

a) When booting the phone with any of the overclocking module there should be no problems, as long as SetCPU / NoFrills did not start and did not read the time_in_state file. Then no changes needed.

b) But if you start them and THEN you insert / remove the modules, etc - please go back to them and select again minimum frequency and maximum frequency EVEN IF they appear as already selected.

Just drag the first slider to the max and the second one to the min.

Also IMPORTANT:

Do not set the module at boottime unless you are absolutely sure the phone is stable with the frequencies. Otherwise you might end up in a boot loop.

PS: To other members trying to help: PLEASE DO NOT REPACK the archive and to offer it as update.zip or init.d scripts, etc.

I will do it in the next few days. The reason is that people get confused what to choose and then they ask questions about those .zips and so on. Better keep things simpler with minimal changes to the system (even these modules, they are very small, ~30kb :) ).

Enjoy guys - and thank you very much for your support!

Do not forget: for anyone interested, I posted a lengthly tutorial on my blog on how overclocking is achieved (disassembly and so on): http://hex.ro/wp/blog/overclocking-an-android-phone-running-with-an-msm-core/

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I've managed to overclock my Arc (running Arc S latest ICS ROM) to run at 1200Mhz - all this WITHOUT a custom kernel and without the bootloader unlocked and so on.

I've read oppinions like this one: http://talk.sonymobile.com/message/184828#184828:

This is plain wrong.

I will offer the module, but now is still in development, since the time_in_state table is still wrong (but that doesn't mean CPU doesn't go to 1200Mhz with any governor installed). Also, I don't know if I will ever fix the time_in_state since it is boring to disassemble - but it can be done.

Here are some screenshots:

1) Running at 1200MHz, but SetCPU insists the maximum frequency is 1024MHz - it probably uses some other values instead of the one on the /sys/devices/system/cpu ..

2) SetCPU Native Benchmark (at 1200Mhz it is around 600, and at 1024MHz it is arround 800 - lower is better)

Although things could have been easier if the kernel would export some symbols - nonetheless it can be done by using the /proc/kmem dump in a similar process described here http://code.google.com/p/milestone-overclock/wiki/Disassembly (but adapted to msm instead of omap2).

I will post a full article too - but I have to write it first - on how to do this...

If you guys are interested or having any questions, just post below ..