[Kernel][OC]Da_G's 1944MHz SGH-i957 LTE OC(Dec 20, 2011)

Original Post Gone. Formatted and tweaked original instructions. Original post by Croak can be found quoted at the bottom of page 8. Please read entire post before asking any questions. All credit goes to Da_G.

This is ONLY for the SGH-i957 and SGH-i957M (Bell).

WARNING: THIS WILL TRIP YOUR FLASH COUNTER [aka VOID WARRANTY]

NEXT WARNING: USE OF ODIN CAN DAMAGE YOUR DEVICE IF USED INCORRECTLY. WE ARE NOT RESPONSIBLE FOR ANY DAMAGE DUE TO FOLLOWING THESE INSTRUCTIONS. PROCEED WITH CAUTION.

Steps:
1. Download and Install the Samsung Drivers for your device. Install Kies, or the latest mobile drivers.
http://xdaforums.com/showthread.php?t=961956
2. Download Da_G's overclock kernel.
http://www.ponack.net/TPC/dagnarf/sgh-i957-oc-kernel-dag-1944mhz.tar
3. Download Odin 1.85
http://www.multiupload.com/0EMX1J7RZJ
3. Open Odin 1.85 as administrator
4. Place the OC kernel .tar file in the PDA slot. (Make sure you do not have any boxes in the options panel checked besides the ones that were checked when opening the program - should only be auto reboot and f.reset time)
5. Place the tablet in download mode. Hold vol up + vol down and hold power until the device powers on into download mode. Hit volume up to proceed after the warning screen
6. Plug the tablet into the computer on a main usb slot and it will be detected by Odin in one of the ID:COM slots (will appear as yellow)
7. Hit Start - the OC kernel should will be flashed to the tablet. Tablet will restart.
8. Go into market and download NoFrills
9. Set Max. Clock Freq. to 1.728, 1.782, 1.836, 1.89, or 1.944 GHz. Set your min clock speed to 192 MHz if desired. If you run into problems, set your I/O scheduler to noop instead of cfq. DO NOT CLICK 'APPLY ON BOOT' UNLESS YOU HAVE THOUROUGHLY TESTED THE STABILITY OF THE DEVICE AT THE SET GHz!!!

If you are unhappy for any reason and wish to go back to stock kernel - you can flash the stock kernel back using steps 3-7 above with the below file.
http://ponack.net/TPC/dagnarf/stock-kernel-odin-image-for-sgh-i957.tar

If you are still experiencing instability at any speed above 1.566 GHz, there are certain .so files (libhardware_legacy.so, librpc.so, and libtalk_jni.so) which limit speeds and can override the OC sometimes. Da_G modified these files which can be pushed to the device through adb commands. I won't explain how to get ADB working, it can be found on XDA elsewhere.

Link to .so files
http://www.ponack.net/TPC/dagnarf/moddedfiles-i957.zip

ADB Commands (do the following once for each file in the .zip):

adb remount
adb push filename.so /system/lib/
adb shell
chmod 644 /system/lib/filename.so

Click to expand...

Click to collapse

Edit by Da_G: Here is a link to the requisite source, always up to date! https://github.com/dagnarf/i957kernel
_________________________________________________________
Credits:
Huge thanks to Da_G for doing ALL of the work on the OC kernel without owning the device. And also for hosting the files. Please Donate to him.
Croak for being the first to test!

Hi. edited the first post with a link to the requisite kernel source at the bottom, don't want to violate GPL now do we! Source is up-to-date with the current v4 release!

After flashing the kernel 4G would not work, so I turned on wifi and had a device reset.

Next reboot, wifi was on, i turned it off to enable 4g and device reset.

third reboot everything acted fine.

quandrant crashes right after score readout.

@ 1836 - setcpu crashed when setting an OC voltage. reboot. cpu spy caused device reset after OC. reboot.

@1784 - device crash during quadrant

@1728 - device crash during quadrant

@1836 - linpack crash.

yea that may have been the issue. ill try that.

Croak/Da_G,
So tonight I was messing around with the OC settings using Antutu and all lower freqs. seemed to work fine so I pushed the envelope to 1944 mhz. and my Tab most certainly did not like that setting. It now will boot into the Home screen but immediately freezes and reboots. I can't even turn it off as it freezes when I try to power off. So if I reflash D's kernel will that wipe the CPU Master settings or do I have to go as far as Odin the stock rom we got last week??? Obviously we need to stay below the 1944 setting......hehehehe!

P.S. I also added D's lib files. I renamed the Legacy file as .bak and left it in the folder so i can restore that one I suppose if need be.

Edit: I fixed it by flashing the stock kernel again. Gonna try the OC again tomorrow as it did seem to be snappier with that running. Just have to stay away from over-OCing the darn thing. Had to try just out of curiosity now i know.

I guess you definitely have to push those lib files for this to work

Sent from my SAMSUNG-SGH-I727 using xda premium

When you use ADB to push the files where do you put the files that you want to push to the device? Do I have to change to that directory or do I have to copy the files to the directory where ADB is loaded from? I tried using ADB to push them but couldn't get it to go? So I ended up using Droid Explorer to copy them to the device then I set permissions using Root Explorer.

There is a graphical program called qtadb which may work well

Sent from my SAMSUNG-SGH-I727 using xda premium

I am a little confused here.


So after following the root method, which flashes the Da_G root kernel, can the device be manually overclocked with setcpu type apps?

Is the OC kernel just to make it active at boot time?


Or is the OC firmware required to do any kind of OCing period?

You mention your "daily use" is the 1.8 ish, so is there an OC kernel at that speed available?


Hopefully this makes some kind of sense...

When you root the first time you have a modified kernel. You can't overclock. Flash the oc kernel in order to do that.

Sent from my SAMSUNG-SGH-I727 using xda premium

So the "1944MHZ" in the kernel name is just the maximum speed the kernel will allow correct?

modestone said:

So the "1944MHZ" in the kernel name is just the maximum speed the kernel will allow correct?

Click to expand...

Click to collapse

Yes just use setcpu do customize the speed

Sent from my SAMSUNG-SGH-I727 using xda premium

orlandoxpolice said:

Yes just use setcpu do customize the speed

Sent from my SAMSUNG-SGH-I727 using xda premium

Click to expand...

Click to collapse

Right on, so whats the consensus on pushing those files over in ADB, pretty much required for this to really work?

Croak said:

Yes. When Da_G gets some time, he said he was going to package it all up into one automagic file, but for now you'll need to push the lib files manually.

Click to expand...

Click to collapse

Right-o, think I will probably wait it out, only had the damn thing 16 hours, may as well get familiar with its stock limitations first