Unpacking a boot image will serve no purpose on building kernels. The kernel image is inside the boot.img and is already compiled as the zimage. Then to build a kernel you don't need to unpack the boot.img either.

Edit: Sorry missed the spot where you said you had ubuntu setup. If setup you need to setup your dev tools, sdk, get a toolchain and the kernel source. O and ditch ubuntu it blows, install mint...

 

+1 on mint
And if you are on a compatible 64 bit machine and ask nicely 2fast might even share his custom bfs linux kernel....



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Lol I forgot about that

 

Not to be a d!ck but did you read the read me in the kernel source? If so I believe it says 4.4.3. Where you are welcome to use which ever you feel like, but I notice really not difference. Right now I have reverted back to the one supplied via aosp. If you want to use a newer version depending on the version the source may need to be edited to build. That or it may break some things as well.

As for the code I am pretty sure you could have found it searching. But it is c and assembly code. I was planning to do a guide but haven't got that far. How ever all you really need to know is the following:

• Download source and extract
• Set makefile in root of source to point to your toolchain. Look for the cross compile line.
• Do not use the supplied kingdom config as it doesn't work. You will need to pull the one from the stock kernel.
• Place .config in your source
• Cd source
• Make menuconfig and edit options you want
• Then type make or make -j4 for good measure