[KERNEL] vz-oc-linaro kernel v4: CM10.1 overclocking kernel - Linaro build

Introduction
This is a replacement kernel for CyanogenMod 10 and 10.1 evita builds. The kernel is designed to be as close as possible to the stock CyanogenMod kernel with a few improvements.

Linaro toolchain:
The kernel is compiled with the latest Linaro toolchain based on gcc 4.7 rather than the default Android toolchain. This may provide performance improvements in some situations. I have made a few patches applied to make it compatible with gcc 4.7.

Overclock:
The highest frequency now available under Settings -> Performance with these kernels is,
I've also included a modified thermald.conf in the flashable zip.

Refresh rate:
I've reverted the refresh rate to the original value from the sense source code (57 Hz). This works better when "Disable HW overlays" is selected.

Downloading and installing
Download the flashable zip,

cm10.1_vz-oc-linaro.4.zip MD5=7233ccffa17fa16a2dc6292ecf755fb4
mega.co.nz
ubuntuone.com

Older versions:
cm10.1_vz-oc-linaro.3.zip MD5=5e0efdfd0390f3f923090a574d142808
mega.co.nz
ubuntuone.com
cm10.1_vz-oc.2.zip MD5=cf2c4ee8ba09627e598b78dcea225d39
cm10.1_vz-oc-linaro.2.zip MD5=2931cc59515949fa461a89ea17c99328
vz-oc.1.zip MD5=2f1740d67cd1d5c02a7ac5489bafe7a0
vz-oc.2.zip MD5=4e4d444130e8eb71c27cc23fed65fc88
vz-oc-linaro.1.zip MD5=ca674641e05595e64698afda8aa02943
vz-oc-linaro.2.zip MD5=2b01472d00e069c53f934c30b49475d1
cm10.1_vz-oc.1.zip MD5=576db9e99b2289dae7fc5b548a0d61b4
cm10.1_vz-oc-linaro.1.zip MD5=1a5f3b50608e6b44da50829b2c04ec5c

If you have HBOOT earlier than 1.14 or have S-OFF, then you can just flash the zip from recovery. This will flash the kernel as well as all required modules and thermald.conf. Otherwise, HBOOT 1.14 users will need to extract the boot.img, enter bootloader mode and run
Then you will also need to flash the zip to get modules and themald.conf.

Compatability
cm10.1_vz-oc-linaro.4 is compatible with CM10.1 UNOFFICIAL build from 16/04/2013 onwards.
cm10.1_vz-oc-linaro.3 is compatible with CM10.1 NIGHTLY build from 01/03/2013 onwards.
cm10.1_vz-oc.2 (and linaro) are compatible with CM10.1 NIGHTLY build from 19/02/2013 only.
cm10.1_vz-oc.1 (and linaro) are compatible with CM10.1 UNOFFICIAL build from 06/02/2013 only.
vz-oc.2 (and linaro) are compatible with CM10 NIGHTLY builds from 26/12/2012 to 13/01/2013.
vz-oc.1 (and linaro) are compatible with CM10 NIGHTLY builds from 28/11/2012 to 25/12/2012.

Future development
I hope to introduce GPU overclocking soon and there will be updated builds as
soon as changes come into the main CyanogenMod repo.

Building the kernel
For those who would like to build the kernel themselves, here are some basic
instructions. First you will need to acquire some tools. You can get the default
toolchain from the CM10 source code at,
Otherwise, if you want to use the Linaro toolchain, you can get it at
Linaro toolchain
You will also need a working boot image to get the ramdisk from. You can build
mkbootimg using these instructions
building mkbootimg
Finally, you can get split_bootimg_pl from William Encks site
download split_bootimg_pl
Clone the repo and change to your desired branch
Now export an environmental variable pointing to your desired toolchain
Copy the config file, run menuconfig once and start the build replacing -j12
with your desired number of threads
Extract a ramdisk from a working boot image and repack with your freshly built
kernel using the following command for cm10,
cm10.1 will need the following cmdline

You are ready to flash your new kernel!

Contact
I hope you enjoy using this kernel! Please also visit the github page for this project for alternative download links and for the source code.

GitHub

Cheers,
Vanja

Hey all, posted a new build with some minor updates. Works well with Corys unofficial builds.

I am really glad that people are enjoying this kernel but I would like to urge you guys to NOT report any issues in the CM10.1 thread or anywhere other than in this thread unless you are using the stock kernel for that ROM.

Also, just to reiterate, cm10.1_vz-oc(linaro).2.zip kernels are ONLY properly compatible with cm-10.1-20130219-NIGHTLY-evita.zip

ps. I will look at Rohans helpful suggestion soon but probably not for the next build.

vanja_z said:

There has been a lot of active development on the kernel for our device with new commits almost every day. For this reason, the kernels I put up have been becoming outdated pretty quickly. For example, the cm10.1-oc(-linaro).2 builds are only EXACTLY compatible with the 20130219-NIGHTLY. You may find the kernels also work with other builds however it is not guaranteed.

I will be putting up new builds roughly once per fortnight and I will attempt to keep the compatibility section up to date.

Click to expand...

Click to collapse

If you set the kernel to install the modules the kernel build generates as well, you will almost completely rid your kernel of these compatibility problems. Unless a kernel commit is merged that also has parts in the device trees, your kernel will still function as it was intended, and nothing should break.

If you need help with an installer for the modules, feel free to grab one of my recent kernel release packages and see how the updater script i use does it.

I've put up cm10.1 kernels!

ps. cm10.0 stable kernel is coming soon, I haven't forgotten, sorry for the delay