[kernel][For CM7 only][LAZY,TUN,CIFS,ondemand tweaks]Adam's kernel[02/10/2012]

adam900710 · 06:35 AM

[kernel][For CM7 only][LAZY,TUN,CIFS,ondemand tweaks]Adam's kernel[02/10/2012]

Hi guys.
I'm a newbie about compiling kernel,and this is my personal compiled kernel based on Hashcode's git source( stock branch),also with some tweaks which I think can improve the responsiveness without bringing extra power consumption( or as little as possible).
This kernel will also be my testing platform to do some MOD porting from Ezekeel's GLaDOS kernel.

Thanks to all great developers in XDA , especially:
-Hashcode & intersectRaven : for their git repo alone with a working .config. alone
-Ezekeel : for his so many great MODs on Nexus S(my phone) and Galaxy Nexus(will be my next phone)
-whistlestop : For his improvement on CM7 (I'm completely unfamiliar with the user land things about android, without him I'll be still using the stock ROM)

Features:
-LAZY cpufreq governor ported from GLaDOS(http://forum.xda-developers.com/show....php?t=1276092) with some tweaks.
-TUN compiled into kernel (especially important for people living in regions with strict network censorship like CHINA! F*ck the GreatFireWall)
-CIFS compiled into kernel along with NLS-utf8 for non-ASCII characters.( Now who cares the size of the internal flash?)
-Minor tweaks on ondemand governor to improve responsiveness.

ToDo:
-BLX porting from GLaDOS(http://forum.xda-developers.com/show....php?t=1257497)
-TouchWake porting from GLaDOS(http://forum.xda-developers.com/show....php?t=1239240)

Because I'm a newbie on kernel development and the MODs above both have some code in hardware drivers, so it will be a long time before accomplish.

The kernel source code seems to work on both CM9 and stock ROM.
So later I'll upload the flashable kernel zip for CM9 and stock ROM after some test.

Download:
CM7:http://www.mediafire.com/?2nsm9lb7ylm3gnl

In next post,I'll post the procedure for compiling the kernel and the wifi driver.

adam900710 · 06:30 AM

In this post I'll post the detailed procedure of compile the kernel.

1.Get the kernel source and wifi driver:
If you want to compile the kernel based on my tweak,
you can use my repo (fork from hashcode's source):https://github.com/adam900710/kernel_omap(branch stock)
Or you can just start from scratch without my tweak:https://github.com/KFire-Android/kernel_omap(only branch stock is tested)

If you are unfamiliar with git,you can learn it on the GitHub's help page:
http://help.github.com/

Tiwlan drivers from neither omapzoom nor CM7 works due the lack of given functions.
ONLY the wifi driver from Amazon seems work. So you need to download the whole zip from Amazon:
http://www.amazon.com/gp/help/custom...deId=200203720

The wifi driver locates in mydroid/hardware/ti/wlan/wl1283

2.Get the cross compile toolchain:
Yes,you can build from scratch according to CLFS(http://trac.cross-lfs.org/),but a newbie like me is glad to use the pre-compiled toolchain like sourcery G++. Omappedia recommanded 2010q1-202(https://sourcery.mentor.com/sgpp/lit...al/release1293), so I use it as the toolchain and it works well.

The self-extrated installation program will install the toolchian without any problem.

Also other toolchain is available like linaro , but according to the post by Ezekeel (http://rootzwiki.com/topic/10855-res...er-toolchains/) , there seems no obvious difference. So the out-of-box sourcery G++ is a good choice.

3.Compile the kernel.

Code:

cd kernel_omap     #cd into your kernel
make mrproper      #clean the source tree( normally you can skip)
make otter_android_defconfig #get the default .config (also you can copy it manually)
make ARCH=arm menuconfig #if you want,you can tweak the config of the kernel.This needs headers of ncurse
make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi -j4 #you should make sure that the toolchain is in you PATH

After some CPU time, the kernel is built, in arch/arm/boot/zImage. Also the modules is built in other places.
Since I built all TUN/CIFS and so on into kernel,so there is no need to install the modules.

4.Compile the wifi driver:

Code:

cd mydroid/hardware/ti/wlan/wl1283/platforms/os/linux/  #cd into the building folder
make ARCH=arm KERNEL_DIR=/home/adam/kernel_omap CROSS_COMPILE=arm-none-linux-gnueabi-  TNETW=1273 -j4  #you need to change the path of KERNEL_DIR

CAUTION: DO NOT add DEBUG=n OR DELETE TNETW=1273....
I don't know why,but if you do so,the wifi driver won't work properly.

5. Package the kernel into boot.img with ramdisk.
Thanks to DooMLord , in his git repo , you can download the tools needed.
https://github.com/DooMLoRD/Kindle-F...er/final_files

Only minor changes are needed for the path ,every thing elso works fine.
You can use the ramdisk extracted from any CM7 boot.img using the perl script.
Then just ./make_bootimg will do everythin for you.