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[Q] Android kernel programming

Hi All
I am a newbi to kernel programming , especially to android kernel.
Can you tell me some good places on the net , that can be great sources for getting in touch with that thing.
I want to become familiar with the android kernel , dalvic etc. ( I speak english and german )
thanks in advance.
Sz_gergo

I am too interested in this subject. I am learning slowly as and when I get time.
kernelnewbies.org
Generally good resource for starting out learning linux kernel
(Which is what the android is built off of)
android.git.kernel.org
Android Kernel Source
lwn.net/Kernel/LDD3/
Online guide to driver development among many other related topics.
pdk.android.com
This guide provides an under-the-hood introduction to the Android platform, and is designed for platform developers and manufacturers building Android-powered devices.
Sorry for not providing the links...xda won't allow me to post links since I have less posts.

Android kernel
Dear All
as i understand, the android kernel source, what you can download from Google , should be enough for building a new kernel to some phone.
If i am right, does that mean that the Linux kernel sources are already included?
Or am i totally wrong?
Thanks for your answers

I am also interested in learning the Kernel Development and ROM development. Can Any one Help.

sz_gergo;11673408 begin_of_the_skype_highlighting 11673408 end_of_the_skype_highlighting said:
Dear All
as i understand, the android kernel source, what you can download from Google , should be enough for building a new kernel to some phone.
If i am right, does that mean that the Linux kernel sources are already included?
Or am i totally wrong?
Thanks for your answers
Click to expand...
Click to collapse
I have the answere for the question above.
After i have inspected the Android kernel sources, it came out, that i have been right.The only source you need for creating a new kernel for a phone, is the complete android kernel.
The linux kernel is allready included.
I think if you want to build a kernel, specific for your phone. you have to overwrite the default dirs with the specific sources of your phone. If it is not allready done by others.

Android Kernel
Hi,
We need to distinguish between Linux and Android. Android was forked from Linux, and now those are managed as separate products. Android usually takes the updates from linux, but there are features in Android which Linux refused to get (such as wakelocks).
So the android kernel source includes all needed to build a working kernel.

Use CM device tree to compile Omni

Hello,
I recently compiled CyanogenMod 14.1 for my Android device using the official sources and want to compile Omni 7.1 for the same device and use the device tree and kernel from the official CM sources because there's no device tree for Omni. Is there a way to "convert" the CM device tree to work with the Omni sources? My exact problem is the compiler doesn't know my device so I can't run something like "brunch [device]" or "make [device]", although I already downloaded all device-specific repositories to the same subdirectory as I'd do it on CM.
Thanks in advance,
Oebbler

Oebbler1 said:
Hello,
I recently compiled CyanogenMod 14.1 for my Android device using the official sources and want to compile Omni 7.1 for the same device and use the device tree and kernel from the official CM sources because there's no device tree for Omni. Is there a way to "convert" the CM device tree to work with the Omni sources? My exact problem is the compiler doesn't know my device so I can't run something like "brunch [device]" or "make [device]", although I already downloaded all device-specific repositories to the same subdirectory as I'd do it on CM.
Thanks in advance,
Oebbler
Click to expand...
Click to collapse
You have to go to your android_device_manufacturer_yourphonecodename repo and rename cm.mk to omni_codename.mk, open it and change cm_codename to omni_codename.
You have also to rename cm.dependencies to omni.dependencies, but the repos included in that file may not be in omnirom source, so you would need to manually sync those repos in your android sorce tree.
You might have to make other minor changes, take a look at the rest of code in that repo.
For further info: https://docs.omnirom.org/Porting_Omni_To_Your_Device

Thank you, but I think I won't succeed in building Omni for my device because I always get strange errors.

Probs will get annoyed, cmsdk, cmhw, and cm encryption are significantly annoying. Also they moved their build dir, generally include useless common subtrees, and named dtbtool with CM suffix. Their build tree might be the most significant hindrance to unified building on Android, not only for the many unnecessary additions and dependencies they have for devices, but also they generally lack a community presence to answer or respond to users, so a lot of us get stuck with cleaning up their mess.
Notice how TWRP has a community presence here and are helpful. I'm not hating on cm, they have been doing this longer than most of us, but for ease id recommend using your rom choices tree.
Also the immensely significant annoyance of having to track devicesettings and the unwillingnes to nuke cmactions, combine it with cmsdk, or at least remove it's dependency in most trees is almost certainly going to cause you errors.
Sent from my One using XDA-Developers Legacy app

Xperia 10 Plus added to Sony's Open Devices program

This means that developers are able to build and flash their own version of Android Pie on these devices.
The Open Devices program is our way to provide access and tools to build and test your custom software on a range of Sony devices. You can access all the resources you need through our Open Devices page on Developer World. We value our open source community and welcome you to participate in our projects via GitHub. Feel free to provide feedback on further resources you may need and where we can improve.
To get started on how to build AOSP for your device, use our build guides for instructions. Please note that this software is meant for developers and can be unstable due to its early stage. As part of our Open Devices program, the project for the Xperia 10 Plus are now available via GitHub where you can contribute and take part in our open source community.
Xperia 10 Plus GitHub project
Software binaries
Source: https://developer.sony.com/posts/xperia-10-and-xperia-10-plus-added-to-sonys-open-devices-program/

Great stuff

How big is the BlissROMs source code file for building unofficial build for ARM devices? Also help about building from the source code.

I want to build my unofficial build for my phone, HTC Desire 816. But I have a limited data plan, and I worried I will running out of my data by downloading a huge source code with unnecessary files for other architectures, phones etc. And I'm just need the ARM and important files.
Also I got these repos from Tarkzim's forum at LineageOS unofficial for HTC Desire 816:
Device tree
Kernel
Vendor
Well, I didn't have any experience at Android development. So maybe can someone give me a guide too?
I'm just know the preparations on the documentation and it's ready, but the steps are confusing for me.
Or maybe if peoples are have their time maybe can someone make the official build?

Maybe it such out of BlissROMs, but I really want to Blissify my phone. Because LineageOS are too plain, no good features like smart charging etc. It just looks a normal Android build from AOSP source.

General [info] Xiaomi 13 (fuxi) Open Source Kernel and Lineage Device Tree

Hi all,
For those of you, like me, who are interested in learning more about developing for custom ROMs, the following links will be helpful for finding .
First is the inclusive list of open source kernel releases by Xiaomi: https://github.com/MiCode/Xiaomi_Kernel_OpenSource
At the bottom of said list is the Xiaomi 13 (fuxi).
Second is the device tree (based on Lineage OS and said to be WIP) by YuKongA: https://github.com/YuKongA/device_xiaomi_fuxi

What is the primary difference between official xiaomi 13's device tree https://github.com/MiCode/kernel_devicetree/tree/fuxi-t-oss and https://github.com/YuKongA/device_xiaomi_fuxi ?

YuKongA's contribution is for Lineage OS, or instead of MIUI it's AOSP. I think.

To give additional information, the Lineage-derived device tree likely originates from: https://github.com/imasaru/android_device_tree_template

Also, the kernel includes a lot of stuff for the hardware and is accompanied by a kernel device tree, which is a kind of 'table of contents' (unless I'm mistaken about the analogy).
"The 'Open Firmware Device Tree', or simply Devicetree (DT), is a data structure and language for describing hardware."
Linux and the Devicetree — The Linux Kernel documentation
I imagine a lot of compatibility issues are lining up the system image and the kernel+device tree.
...
(At this point, I'm really just spouting off some things as I'm learning, so feel free to correct or ignore me as I'm going along!)

Aquariuslt said:
What is the primary difference between official xiaomi 13's device tree https://github.com/MiCode/kernel_devicetree and https://github.com/YuKongA/device_xiaomi_fuxi ?
Click to expand...
Click to collapse
1/Xiaomi Kernel OpenSource
2/Xiaomi fuxi prebuilt

Veiranx said:
To give additional information, the Lineage-derived device tree likely originates from: https://github.com/imasaru/android_device_tree_template
Click to expand...
Click to collapse
You can find older ones.