[TUTORIAL][DEV]Compile Kernel for Samsung Galaxy Grand Quattro[GUIDE] - Samsung Galaxy Grand Quattro

Hi everyone,
In computing, the kernel is a computer program that manages input/output requests from software and translates them into data processing instructions for the central processing unit and other electronic components of a computer. The kernel is a fundamental part of a modern computer's operating system.
When a computer program (in this case called a process) makes requests of the kernel, the request is called a system call. Various kernel designs differ in how they manage system calls (time-sharing) and resources. For example, a monolithic kernel executes all the operating system instructions in the same address space to improve the performance of the system. A microkernel runs most of the operating system's background process in user space, to make the operating system more modular and, therefore, easier to maintain.
For computer programmers, the kernel's interface is a low-level abstraction layer.
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Here I will provide you the way to compile Kernel for Samsung Galaxy Grand Quattro..
From the begining you have to have the following things for working with the Kernel Development
Code:
[LIST=1]
[*]Knowledge In C Programming Language(Elementary. but a bit more)
[*]Ubuntu Linux or Other Linux Distribuition (Must be 64-Bit)
[*]Working Internet Connection
[*]Knowledge to work with Git(I prefer this to work hasslefree and with Cleanliness)
[/LIST]
If those Above all Criteria are fulfilled by you jump onto This Tutorial

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Setup your Linux
Download Ubuntu - > http://releases.ubuntu.com/13.10/ubuntu-13.10-desktop-amd64.iso
Install the Ubuntu 13.10 if you haven't then proceed
This guide applies to all variations of Ubuntu 13.10 Saucy Salamander 64 bit. Do not use the 32 Bit version. Also, PAY CLOSE ATTENTION when to use "sudo" and when to not. It can make things funky if you do something as root that you shouldn't.
Much thanks goes out to Google, ProTekk, Canonical, and everyone else that I read a random paragraph here and snippet there.
IF YOU ARE USING A VIRTUAL MACHINE, save yourself the trouble and check out my other post here. Otherwise continue on, brave soldier.
First, let's set up the correct JDK.
Many of you probably have some kind of wrong Java installed unless you're starting with a fresh Ubuntu base, and even then maybe.
Let's get rid of that. Copy and paste this into a Terminal window:
Code:
sudo apt-get purge openjdk-\* icedtea-\* icedtea6-\*
Follow the instructions to remove OpenJDK. If you must keep it, it's possible. But I'm not going to tell you how to do it here. I don't want any chance of confusion or mistake.
Now copy and paste the following into the Terminal:
Code:
sudo add-apt-repository ppa:webupd8team/java
This will add the correct PPA to your system for updated builds of Java 6 JDK that are compatible with 13.10. No more unrecognized Java version errors! And it will update automatically with the rest of your system.
Next, we actually need to install the package. More copy-paste:
Code:
sudo apt-get update && sudo apt-get install oracle-java6-installer
Follow the on-screen instructions. You have to Accept the Licensing Agreement to complete the install. Hopefully no human centipede clauses.
Let's make sure the correct version of Java is activated, run the following Terminal command:
Code:
java -version
You should see something like the following:
Code:
java version "1.6.0_45"
Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01, mixed mode)
Ok, back to a fresh Terminal prompt. Time for installing the guts to build stuff in Ubuntu:
Code:
sudo apt-get install git-core lzop ccache gnupg flex bison gperf build-essential zip curl zlib1g-dev zlib1g-dev:i386 libc6-dev lib32ncurses5 lib32z1 lib32bz2-1.0 lib32ncurses5-dev x11proto-core-dev libx11-dev:i386 libreadline6-dev:i386 lib32z-dev libgl1-mesa-glx:i386 libgl1-mesa-dev g++-multilib mingw32 tofrodos python-markdown libxml2-utils xsltproc readline-common libreadline6-dev libreadline6 lib32readline-gplv2-dev libncurses5-dev lib32readline5 lib32readline6 libreadline-dev libreadline6-dev:i386 libreadline6:i386 bzip2 libbz2-dev libbz2-1.0 libghc-bzlib-dev lib32bz2-dev libsdl1.2-dev libesd0-dev squashfs-tools pngcrush schedtool libwxgtk2.8-dev python gcc g++ cpp gcc-4.8 g++-4.8
When that is done installing, run the following command in your Terminal window:
Code:
sudo ln -s /usr/lib/i386-linux-gnu/mesa/libGL.so.1 /usr/lib/i386-linux-gnu/libGL.so
That's it on the package side of things.
You guessed it, time for more Terminal. This really is the easiest way, seriously. And it's totally worth it when you're basking in the glory of a bunch of people on XDA.
The binary for a program called "repo" will let you talk to git servers and download all that precious source code. That second part after the && allows it to be executable:
Code:
mkdir ~/bin && curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > ~/bin/repo && chmod a+x ~/bin/repo
Use your favorite text editor to open ~/.bashrc
I like nano:
Code:
sudo nano ~/.bashrc
At the very bottom, add the following line:
Code:
export PATH=~/bin:$PATH
Save it. In nano that would be Ctrl-O and then Enter. Then Ctrl-X to exit back to a prompt. Restart bash:
Code:
source ~/.bashrc
In the terminal, navigate to where you would like to store the Android source code. The directions below will make it in your home folder, but if you have limited space, you may want to create it somewhere else. Faster is better, i.e. SSD would be best, USB external is basically unusable. Here we go:
Please hit the "Thanks" button if this post helped you out![/QUOTE]

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Downloading the Source and Compiling zImage
First make the directory on which you are going to Compile the Kernel in
Code:
$ mkdir Quattro
$mkdir kernel
$ cd Quattro/kernel
After moving into the Kernel download the Kernel source
Code:
$ git clone https://github.com/yajnab/android_kernel_samsung_msm8625.git -b 8625_samsung ./
After downloading has been completed(It will take an while as size is about 600 MB) you are ready to compile the Kernel.
Now to compile the zImage you need to issue these commands
Code:
$ make delos_defconfig
$ make -jx
(Here x is the number of cores your computer is having, if you are in dilemma its best to use -j2 to avoid overheating of your computer)
You will see various lines where the C files are getting compiled and the modules are made. At the end of the compilation you will find your zImage in the
Code:
arch/arm/boot/[COLOR="Blue"]zImage[/COLOR]
The zImage is your Kernel
So what is the difference bewteen zImage and the Kernel?
Answer:- zImage contains the drivers for your computer to work but you need something called Ramdisk which has to be repacked with the zImage to form a boot.img which can be flashed in your phone.
So what is the Ramdisk?
Answer:- Ramdisk are some files which contains some scripts which initiate your device settings for the kernel to boot up and to frame your device while its booting up.

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Packing your boot.img and getting ready to flash it
So ready with the zImage right? Now get prepare to Flash it on your phone
To make the bootimage you need to make a new folder (Not in the folder where your kernel source is)
Lets name the folder as packing
Code:
$ cd ../../
$mkdir packing
$cd Quattro/packing
Lets download the Build Tools
Code:
$git clone https://github.com/yajnab/build_tools.git -b master tools
After the cloning is completed you need to get a boot.img from your stock ROM.
Do the Following things then
Copy the boot.img from the stock Rom to this directory
Copy the Compiled zImage to this directory
so on doing a $ ls it will end up like
Code:
[COLOR="SeaGreen"]/tools[/COLOR] boot.img zImage
On ending up with these do this following..
Code:
$ mkdir unpack
$ cd unpack
$ ../tools/unpackbootimg -i ../boot.img -o unpack
$ rm boot.img-zImage
$ cp ../zImage ./
$ mv zImage boot.img-zImage
$ ../tools/mkbootimg --kernel boot.img-zImage --cmdline 'androidboot.hardware=qcom loglevel=1 vmalloc=200M' --pagesize 4096 --base 0x00200000 --ramdisk_offset 0x01300000 --ramdisk boot.img-ramdisk.gz -o ../new-boot.img
Now download any of the flash-able Kernel zip files and do the following
Make a folder
copy the newboot.img found in the packing folder
from the flash-able zip take the META-INF folder and place with the boot.img
zip them up
Flash it in your phone

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More Advacing things will go in here

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Credits
I Convey my thanks to these Persons who have helped me in Many ways
My Computer
My BSNL Broadband Connection
My Samsung Galaxy Fit
My Father - Dr. Nachiketa Bandyopadhyay
My Soulmate - Darshana Chatterjee
Friend and Recognized Themer - Crytech
Booting Confimation - Gody
My Tester who inspired(forced in good language) for the kernel - Manoj Kumar
Developers
Adipat
Sakindia123
entropy512
Ezekel
faux123
doomlord
Linus Torvalds
Aditya Fattepurkar
Members of Galaxy Fit group and Linux and Programming Group

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What about those *.dtb files? Do I need to copy kernel modules as well ?