I was just stumbling around lauchpad and found this:
https://code.launchpad.net/~ubuntu-branches/ubuntu/raring/ubuntu-defaults-nexus7/raring
Is this part of the source code for Ubuntu for Phones?? Not much is said about it on the page. The source tree looks different than the ubuntu source tree, but it might just be patches and a tool-chain to apply to ubuntu-arm.
Edit: This is not the source code, sorry. It's for Ubuntu on the Nexus 7: https://wiki.ubuntu.com/Nexus7/Installation.
Dev's,
This is for those of you that build ROM's from source code and have forked repo's from the main line so you can make changes for your specific device i.e. android_framworks_base. These mini scripts will allow for the following
1. Download your local repo's and add a git remote back to the fork so you can fetch the updated head's
2. Fetch the heads as you see fit
3. Copy the updated source into your local source build folder after a $repo sync
4. Push back up the changes after the ROM has been tested
There is full set of instructions at the following location.
https://github.com/g60madman/repo_update_tool
These mini scripts can be edited for all flavors of source code be it AOSP, AOKP, CM, or whatever; along with any repo structure github, google, bitbucket etc..
Enjoy!
Introduction
I am writing this guide as I was unable to find a well-documented thread over XDA (there are just a lot of them). In case there is anything that concerns this guide, feel free to ask in this thread. I expect you to know the basics of Linux, GIT, Android. Please look over some guides in the forum in case you are not familiar with them. In case you want to contribute to this, feel free to do so. I welcome everyone's contribution to be it fixing my derp, pointing a mistake or adding a new section.
Links to some nice documentations:
Git Documentation
Linux Kernel Newbies
How to take logs in Android
How to get an Android kernel up to date with linux-stable
Checking Current CAF Tag of the Kernel
We will be using best_kernel for this purpose, whose aim is to compare your current kernel source code with different CAF tags and select the best possible match using git diff.
Clone/Download your kernel repo and commit your changes(if not already committed) as best_kernel depends upon git diff to compare changes.
Depending upon your kernel version, add required CAF kernel repo as remote and fetch it. best_kernel will use this fetched data to compare changes.
After fetch is done, run best_kernel. It should run automatically if you have placed dotfiles in the $BIN directory and have the necessary dependencies installed.
best_kernel will compare changes and will provide results based on that. However, depending on the number of tags, it will take time. A lot of time, so go and grab a cup of coffee till then.
A Dummy Example:
Downloading stock kernel source code from OEM’s website
Code:
wget http://nokiaphones-opensource.azureedge.net/download/phones/Nokia6.1_V2.22J.tar.bz2 && tar xvjf Nokia6.1_V2.22J.tar.bz2 && cd kernel
Adding and committing all files due to lack of a .git dir.
Code:
git init && git add --all && git commit -m "Initial Commit"
As the kernel source code version is 4.4, I will add 4.4 remotes from CAF and fetch it.
Code:
git remote add caf https://source.codeaurora.org/quic/la/kernel/msm-4.4/ && git fetch caf
After fetch, I will check for the current CAF tag using best_kernel. As my device platform is sdm660 and CAF has been releasing sdm660 tags as sdm660.0, I will be using it as an argument in best_kernel. This will ensure that best_kernel doesn’t waste time checking CAF Tags of other platforms and will speed up the process considerably.
Code:
best_kernel "*sdm660.0"
RESULT will be something like this:
Code:
Best match TAG: LA.UM.6.2.r1-06900-sdm660.0 Lines changed: 177924
What is CAF/Code Aurora | CodeAurora Android Releases Page | CAF Kernel Sources
Creating/Importing GIT History for Kernel Source
A lot of OEMs release kernel sources in a compressed format excluding the .git dir which results in no git history. Creating or it's better to say to import one is simple and easy.
Download and check the current CAF tag of your Android kernel source.
Note: If your chipset is not Qualcomm, you should visit Linux Kernel Source or AOSP's Kernel Common and use that as a base while checking out to the specific version of your kernel source you are going to copy-paste. Qualcomm devices can also use that as a ref but I will recommend them to use CAF source.
Based on that CAF tag, download the respective kernel repository from CAF and checkout for that specific tag.
Copy and paste your downloaded kernel source (with no history) over the CAF one (which has the history of that CAF tag).
Commit the changes.
You have accomplished creating/importing history.
A Dummy Example:
My current CAF tag is LA.UM.6.2.r1-06900-sdm660.0.
Therefore, cloning kernel source from CAF and checking out for this tag while creating a new branch named rebase.
Code:
git clone https://source.codeaurora.org/quic/la/kernel/msm-4.4/
cd msm-4.4/
git checkout tags/LA.UM.6.2.r1-06900-sdm660.0 -b rebase
Now, I will copy-paste the kernel source that I downloaded from OEM's website over the CAF one. Assuming the downloaded kernel is in ~/Downloads/kernel and CAF kernel source is in ~/msm-4.4 directories.
Code:
#Renaming the dir so, that it will get merged while copying due to similar names
mv kernel/ msm-4.4/
cp -avr msm-4.4/ ~/msm-4.4
cd ~/msm-4.4
git status
git commit -m "Import Nokia Kernel Source"
Keep in mind that a .gitignore is generated which can and will ignore files during commit which were not getting ignored earlier due to its absence. In case during compilation you encounter any error stating about missing file, add it forcefully and commit again.
Remember, its always good to split that one big commit into small parts. It's helpful when you start rebasing your kernel usually when new CAF Tag for new android versions come out. Solving a few conflicts ina lot of commit is much better than solving a load of them in one. It also gives you a chance to easily diff on websites like GitHub so that you can figure what's a particular line is doing.
Doing that is also easy. Just reset head for a particular folder like driver/touchscreen and commit them separately. Check git rebase documentation which will help you with this.
Upstreaming your Kernel
Merging upstream versions is a really good thing. It brings in security patches, stability, new features and much more. The usual and best way is to visit Linux Kernel Source and check if there are upstream updates available. If yes, start merging them in your kernel source one by one.
Note: If your chipset is not Qualcomm, you should visit Linux Kernel Source or AOSP's Kernel Common and use that as a base. Qualcomm devices can also use that as a ref but I will recommend them to use CAF source.
A Dummy Example:
Assuming my current kernel version is v4.4.205, I will fetch v4.4.206 from Linux Kernel Source and merge that. I can also fetch and merge different branches from CAF Source which are usually upstreamed with Linux-stable (for example, aosp/upstream-linux-4.4.y branch)
Code:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git v4.4.206
git merge FETCH_HEAD
Fix conflicts if you get some. What to keep and what not is a question that depends upon the device to device. Usually, you should compare local changes and upstream and try to figure out what could be the best way to fix it. I will advise to check the history of that file in upstream and see which commit caused that conflict and why. You can also check similar merges by other same kernel versions to see if they had the same conflict and how they fixed it.
I will also advise merging AOSP's kernel/common and new CAF upstream tags (Only QCOM devices should merge new CAF tags) regularly when available. The reason is pretty simple. There are commits that get merged in AOSP like which improves performance or other stuff which doesn't get merged in Linux Kernel Source. This way you can get the benefit from all sources. This, however, is not pretty easy and might result in a huge number of conflicts considering if OEM has modified the source a lot from upstream.
CAF also hosts f2fs and other file system changes on their servers. Merge it if you want and use it.
Compiling Standalone Kernel
Compiling a kernel standalone requires you to have a compatible toolchain like GCC or Clang. The best way to figure out which one suits your need is testing and debugging. The standard AOSP GCC toolchains are recommended for devices with old kernels, to begin with, while newer ones can use clang with backports or upstream merges. In case you want to compile with clang, checking out android-kernel-clang is a good way, to begin with.
Compiling standalone kernels can give a lot of missing headers errors/warnings. This is due to not compiling it in a ROM environment. This can be easily fixed either by correcting paths of those header files being included or creating an out dir manually and using it as output. You can also use this commit to do that automatically.
Clone your kernel source and desired toolchain(s). Export arch and cross compiler arguments. Choose the desired defconfig to make and compile.
A Dummy Example:
I will clone the kernel source and toolchain in the same dir and export the following arguments in kernel source root dir.
Code:
export ARCH=arm64
export CROSS_COMPILE=/media/hdd/aayush/kernel/aarch64-elf-gcc/bin/aarch64-elf-
make nokia_defconfig
make -j$(nproc --all)
Kernel conflicts might occur. You can search on GitHub to check if someone has fixed that already, otherwise fix the issues yourself. Comparing code with upstream repositories is also a way to figure out the differences. Choosing defconfig can be a bit tricky if you are doing bringups. I recommend pulling the current defconfig from your device itself. Its usually by the name of config.gz in /proc/ of your device.
Links to some cross compiler
GNU Toolchain by ARM
DragonTC
GNU and Linaro
Working with TWRP from Scratch
This post is supposed to help you with building TWRP from scratch for the first time if you are a newbie. There are some good resources already available for that over the web, specially XDA. I am linking some good ones below that you can read for more info on it.
How to compile TWRP Touch Recovery
The aim of a device tree is to contain the device-specific code for the build you are doing. In this case, as we are building TWRP which is a custom recovery, only flags relating to building TWRP and a normal recovery are enough to build it. Adding system specific codes like partition sizes for the system, vendor, boot and other doesn't contribute anything. An example tree can be begonia's tree hosted on TeamWin's org maintained by me.
Now coming to the device you want to build TWRP for, you will the following :
- A working kernel
- Device-specific binaries/libraries etc required for features like encryption which heavily differs on OEM implementation
AB devices need an extra commit in their kernel to make 'fastboot boot' command work: init: initramfs: disable do_skip_initramfs . Additionally if your device ships a separate DTBO image you will also need the following flag and the DTBO image: begonia: Build DTBO image into recovery
Newer devices are nowadays coming with 'fastboot boot' command disabled. Nokia 8.1 is an example of it. To make it work again, you might need to tweak bootloader which can prove to be risky.
Now coming to creating a device tree for TWRP. The very first step is to look out if someone else has booted TWRP on a similar SOC, OEM or same device. It can be used as a reference to fix similar/OEM related bugs and hacks quickly. In case, one doesn't exist, just pick a latest one from Teamwin's Github org for the android version you are compiling for.
Reserved (2)
Wew many thanks,
Thanks
Have just started exploring xda chef central.
I cam across this guide, really ahlepful Hope you complete it soon.
Updated the thread. Fixed formatting, links and added a new section.
How To Unofficially Unlock Bootloader For LG G8
We all know LG G8 is a android device. It's open source. But I recently bought a LG G8 only but it's locked to sprint sim . No any sim work. I can't unlock bootloader. I can't root. I can't flag firmware or install custom recovery. Anyone know here , how to totally remove firmware and but another firmware ? Why we can't build a method to do that?
TheImpulson said:
Updated the thread. Fixed formatting, links and added a new section.
Click to expand...
Click to collapse
Can you create a guide for, "How to Rebase an Android Kernel". Like from Android 9 to Android 10?
thanks for this guide bro
While using best caf kernel, Prefix of the caf tag should start with a -
For example, "*- sdm660.0"
@theimpulson
Hey there,
Am getting this error del.dog/megupebinu.txt
While trying execute best_kernel script
This is helpful, thanks mate
@theimpulson I had a question: (Before reading this guide) I had already downloaded stock Samsung sources and git init push the thing to my Github. So will anything bad happen if I did it this way or do I have to rebase it with CAF?
Also what are the benefits of these so-called CAF based kernels everywhere? Improved performance? Cuz I really wanted to compile my own kernel specifically for performance with WSL-2 (shameless plug)
Thanks in advance and sorry if the @ bothered you,
Ishaq
NullCode said:
@theimpulson I had a question: (Before reading this guide) I had already downloaded stock Samsung sources and git init push the thing to my Github. So will anything bad happen if I did it this way or do I have to rebase it with CAF?
Also what are the benefits of these so-called CAF based kernels everywhere? Improved performance? Cuz I really wanted to compile my own kernel specifically for performance with WSL-2 (shameless plug)
Thanks in advance and sorry if the @ bothered you,
Ishaq
Click to expand...
Click to collapse
The existing sources are fine, no issues if you are fine without any git history.
SOC specific optimizations, bug fixes etc. Nothing more. So, yeah, if you want SOC specific optimizations, performance improvements, you will want to merge latest CAF tags for your kernel.
theimpulson said:
The existing sources are fine, no issues if you are fine without any git history.
SOC specific optimizations, bug fixes etc. Nothing more. So, yeah, if you want SOC specific optimizations, performance improvements, you will want to merge latest CAF tags for your kernel.
Click to expand...
Click to collapse
thanks a lot for the reply! Another thing, because of your suggestion I tried to Import the git history (and i succeeded). Then I wanted to upload these sources to my own Github, which I can't figure out how to do. It only gives Github repo for the place where it came from (msm-3.18). Help me please
Edit: The guides which I found for merging CAF tags say that my base also has to be CAF (which it isn't) and this guide here basically does not work
Two does Moto G Power 2021 Borneo use the Qcacld3.0 driver? If not which driver does it use instead?
Release MMI-QPE30.79-41 · MotorolaMobilityLLC/kernel-msm
sofiar push for android 10
github.com
no clue about qcacld3.0, dunno what it is
but
git clone -b MMI-QZB30.Q4-43-130 https://github.com/MotorolaMobilityLLC/kernel-msm.git
you can click on download source on the main github page here but itll break all the symlinks and your kernel wont compile so its better to clone repo
If your referring to the display driver it uses ilitek.
need help to compile boot.img with this source code (from given config file )or other it is yacto project for more detail please pm interest is involved
source code