Database Info

Compiling Android + Kernel from Source.

Hi there,
Now, I understand that there's a thread or two and a few web pages directed at compiling Android and its kernel from source.
However, the thread in question is months old, and didn't fully explain the process.
As for the web pages, they are mostly outdated and don't include enough information, not to mention desire specific instructions.
I think that, properly explained, building Android shouldn't be daunting, and everyone should be able to attempt it, if they wanted to.
So, I hope to compose a comprehensive guide on how to do just that.
The problem is that I myself have not been able to put enough instructions together to be able to complete a build. And there is no point digging up old threads.
So, If anyone who knows the ropes (that is, compiling android and a kernel from source) would be willing to lead the way, I'd happily turn it into an easy to understand guide.
Josh.

fllash said:
Hi there,
Now, I understand that there's a thread or two and a few web pages directed at compiling Android and its kernel from source.
However, the thread in question is months old, and didn't fully explain the process.
As for the web pages, they are mostly outdated and don't include enough information, not to mention desire specific instructions.
I think that, properly explained, building Android shouldn't be daunting, and everyone should be able to attempt it, if they wanted to.
So, I hope to compose a comprehensive guide on how to do just that.
The problem is that I myself have not been able to put enough instructions together to be able to complete a build. And there is no point digging up old threads.
So, If anyone who knows the ropes (that is, compiling android and a kernel from source) would be willing to lead the way, I'd happily turn it into an easy to understand guide.
Josh.
Click to expand...
Click to collapse
I followed this guide here and successfully compiled a modified HTC Kernel and I had very little Linux and Android experience.
Obviously instead of cloning the Cyanogen git, you just use the gits you wish to compile

Mekrel said:
I followed this guide here and successfully compiled a modified HTC Kernel and I had very little Linux and Android experience.
Obviously instead of cloning the Cyanogen git, you just use the gits you wish to compile
Click to expand...
Click to collapse
Thanks for the link
Though i don't fully understand the whole 'git' thing. Where do i find them? And how to i know which ones are the ones i want to use?
Josh
EDIT: Also, how do you 'edit' the kernel (i imagine it is somewhat like make menuconfig?). Also:
- Are these sense kernels?
- How do you add modules like OC and UV?

fllash said:
Thanks for the link
Though i don't fully understand the whole 'git' thing. Where do i find them? And how to i know which ones are the ones i want to use?
Josh
EDIT: Also, how do you 'edit' the kernel (i imagine it is somewhat like make menuconfig?). Also:
- Are these sense kernels?
- How do you add modules like OC and UV?
Click to expand...
Click to collapse
A git is a repository for source code, developers upload their source code there and can commit changes. The commit can allow descriptions of what was changed and also details the files changed.
The git system allows other people to add to the source if they have permission, or allows others to read the changes and download the source code.
Git links are usually posted by people who release software, as Android is GPL licensed so people have to release their source code if they're distributing their work.
Editing the kernel, take a look into the git and the commits and it will show you which files were changed and how exactly they were changed. That will give you the best understanding.
UV/OC is done by changing the acpu table in the architectures files and changing the minimum/maximum voltage figures in the board_bravo.c file.
The Cyanogen kernels are not Sense kernels no, it's a modified Google Kernel.

Thanks for the explanation. I followed the guide and built the rom, and it works (always a plus )
Now, the next thing is the kernel. How do I build a kernel with the CM tweaks integrated? I understand that all i would be doing is rebuilding the same one that is already installed, but im doing it to learn.
So, if i synced the GIT, does that include the CyanogenMOD kernel source? If it does, where is it and how do i rebuild it. If not, where do i find it?
Thanks,
Josh.

[Request] Need isofs.ko udf.ko for kernel 2.6.36.4 to mount ISO image files

Till now, I still haven't find the isofs.ko and udf.ko for Kernel 2.6.36.4.
I want to mount ISO image files in Android 3.1.
Can anyone compile them for me? Thanks a lot!
My tablet is Samsung P7500
Follow is a detail descriptions of my system kernel.
htt p ://droidbasement.com/db-blog/?p=2395
10.1 3G, Touchwiz UX (HC 3.1 (stock); GT-P7500):
boot-cm_2636.4_p4_ux-oc-xtra-vfpv3-d16_fp-112011.zip

No one can help me
I will try to learn uburtn，....

Johnyea said:
No one can help me
I will try to learn uburtn，....
Click to expand...
Click to collapse
Ubuntu is not that hard to learn, and there are many tutorials for how to compile the Linux kernel, let alone the Android kernel, I would suggest however starting with tutorials to compile a normal linux kernel for your Ubuntu system first, then when you have a good understanding of how to compile it, go ahead and then build an Android kernel with the modules your requesting. Now I'm not sure if the Android kernel configuration supports these modules since Android itself really doesn't use any CD/DVD file systems but nothing is impossible I suppose.

Yes, I got it.
I compiled the modules what I need.
And thery are working fine for my Tablet.

Johnyea said:
Yes, I got it.
I compiled the modules what I need.
And thery are working fine for my Tablet.
Click to expand...
Click to collapse
I'm glad you got it working, congrats
Sent from my LS670 using XDA

[Question] Kernel Compilation for Modules

First post in the Dev section but this seemed to be the place to talk about kernel compilation and module development.
I have twice now, and am working on my third kernel compilation for the purposes of custom module building for the TF700 and the TF201.
The question I have has to do with the compilation process. Every time I have gone through this with the downloadable Asus Kernel zip I run in to several issues. Either missing references in code or portions that won't compile at all. Is this normal for kernel compilations? I would have thought that it would be fully compilable out of the box ( so to speak). Is it ASUS or just android/Linux in general that works out this way?
Is there a better way to do it? Should I use some generic source with the same version numbers? The current source is just not working at all. I am using an Ubuntu distro. Have the cross compile tools etc... but it just fails. I have already resolved two missing definition references and it just keeps on failing in new places
Hopefully this question doesn't offend developers. I have moved from WinPhone to here and want to better my understanding of how this should all work but need to start with some basics before I can make a meaningful contribution.
Thanks.
P.S... I looked and didn't find a "Compiling android kernels for dummies" book

hx4700 Killer said:
I looked and didn't find a "Compiling android kernels for dummies" book
Click to expand...
Click to collapse
"Dummies" doesn't write a book on kernel dev. Too wrapped up in telling people how to download iTunes.....
Use your "Google". And when you find it, Google XDA University.
There, you will find steps for setting a build environment and kernel and cross arm.
Understand, all kernels are different, but a good place to start. Plus, you learn how to use Google. An added bonus.
Oh... and... as an extra bonus, I will move this to Q & A, as this post has no development work attached. :silly:
MD

My question wasn't HOW to cross compile. I have done it.
My question is WHY are there so many errors that need correcting when compiling the ASUS downloadable kernels and if this is typical of the source from any device or just ASUS?

hx4700 Killer said:
The question I have has to do with the compilation process. Every time I have gone through this with the downloadable Asus Kernel zip I run in to several issues. Either missing references in code or portions that won't compile at all.
Click to expand...
Click to collapse
I had to fix exactly one pair of quotes vs. angle brackets somewhere in the RIL - get the patch pack from my kernel and apply the ril include fix. Then it should compile. If not, you are doing something wrong.

Can you post any links or names of everything ill need to get started on cross compiling a kernel for my tf700t I download the source and get my config.gz and am running a ubuntu distribution but if you could post a link to a tutorial that has detailed instructions that will work for the infinity that would be greatly appreciated thankyou

alexcass4 said:
Can you post any links or names of everything ill need to get started on cross compiling a kernel for my tf700t I download the source and get my config.gz and am running a ubuntu distribution but if you could post a link to a tutorial that has detailed instructions that will work for the infinity that would be greatly appreciated thankyou
Click to expand...
Click to collapse
Step 1: Get a suitable ARM toolchain. I can't help you here with Ubuntu because I'm using Gentoo and their crossdev tool (http://www.gentoo.org/proj/en/base/embedded/handbook/?part=1).
Step 2: Cross-compiling the kernel works just as for native kernels (make menuconfig, make), but you have to pass parameters to each make, e.g. make ARCH="arm" CROSS_COMPILE="arm-gentoo-linux-gnueabi-" (or whatever your toolchain is called)
Step 3: For the TF700-specific blob stuff I have written a detailed tutorial here: http://forum.xda-developers.com/showpost.php?p=36925180&postcount=4

[Help] Making N5 Kernels

I've been trying to find the best way to compile. I found a guide on youtube "http://www.youtube.com/watch?v=IV4jhXWc7AE", but it is a little outdated and I'm having some trouble following him. The kernel source that he has has a lot of folders and the only kernel source I've found for the N5 has 2 files. So I'm missing something in finding the kernel source it seems.
It would be awesome if I could get some help and maybe pointed in the right direction. The only problem is that I'm a auditory and kinesthetic learner.
I have Ubuntu installed and ready to go, I also have the lastest NDK, and I have the AnyKernel.zip.

Question Help compiling kernel with KVM

Hi,
I wanted to compile a custom kernel with KVM for the ROG Phone 5 on the latest Android 12 (EU variant) so I looked at the Kirisakura kernel for base (from @Freak07) and I looked at the script that starts compiling the kernel. I could not find some things that was required such as the Google's GCC thing or the "DU_Tools" but I still managed to start compiling the kernel after editing the defconfig file using make menuconfig to enable KVM. Once I did that I ran the script but after like two minutes I got an error (Error 2).
So can someone help me doing this please?
Thanks.

Hey Alex - been looking in to creating a build script using docker for this out of curiosity.
Out of interest though - how are you planning to use KVM once it's enabled?

Moved all of my development efforts from XDA.

chrisaw said:
Hey Alex - been looking in to creating a build script using docker for this out of curiosity.
Out of interest though - how are you planning to use KVM once it's enabled?
Click to expand...
Click to collapse
Hey, I didn't tried using docker (because I don't know how to xD) and I want to use KVM because I heard that the Snapdragon 888 is compatible with it so I was thinking about doing a Windows 10 arm VM with native performance.
chrisaw said:
Got this building cleanly and producing a flashable ZIP:
GitHub - cawilliamson/Kirisakura_ANAKIN_ROG5 at master_release_s_1
Contribute to cawilliamson/Kirisakura_ANAKIN_ROG5 development by creating an account on GitHub.
github.com
Build instructions:
Code:
$ cd <kernel sources>/build/
$ ./build.sh
You will need Docker installed on your system via whatever means necessary and this is really aimed at Linux systems although you could also run the build on a Windows or Mac PC if you setup Docker correctly.
Click to expand...
Click to collapse
Thanks I will try that

Moved all of my development efforts from XDA.

chrisaw said:
Your chances of getting that working easily are slim.
Adding the KVM support to the kernel is easy but the problem you then get is about switching the CPU to "HYP" mode. (just based on what I read online)
If you have further info about this I'd be interested in reading it and seeing if we can get something which works. What I can tell you is that /dev/kvm does not get created simply by the changes I made.
Also be aware that /proc/config.gz is spoofed in these kernels with the "stock" config file so running something like "zcat /proc/config.gz" wont show KVM is enabled but it is.
Click to expand...
Click to collapse
Yes you are R8! Without hyp we can't enable KVM support.. but i found a site where telling android 13 has full KVM support.. but don't know it's true or not..
Because KVM support only available on some snapdragon chipset only..
Redirect Notice

Can't all of this work be ported to the Infinix NOTE 8 on Android 10 too?