Download android kernel

The GKI kernel must be configured to run on a diverse set of devices. Therefore it must have built-in support for all the subsystems and options required for all these devices, not including the loadable modules that are used to enable the hardware. Partners should request the needed config changes to dev kernels. To facilitate a clean separation between the GKI and vendor components, the boot partition contains only generic components, including the kernel and a ramdisk with GKI modules.

A new version of the boot header v3 is defined to indicate compliance with the GKI architecture. The GKI version of the boot images is delivered by Google and replaces the vendor's version of the boot image when testing for GKI compatibility.

The ramdisk for first-stage init , recovery , and fastbootd is an initramfs image comprised of two CPIO archives that are concatenated by the bootloader. The second comes from the boot partition. A summary of the changes is provided here. See Vendor boot partition for details. The boot partition includes a header, kernel, and a CPIO archive of the generic portion of the boot ramdisk. With a boot header v3 boot partition, these sections of the prior boot partition are no longer present:.

The latest arm64 android The vendor ramdisk is a CPIO archive that contains the vendor modules required for device boot.

This includes modules to enable critical SoC functionality as well as storage and display drivers needed to boot the device and display splash screens. After decompression, the result is the generic ramdisk overlaid on top of the file structure of the vendor ramdisk. For the Android 11 platform release, devices launched with a v5. All submitted patches must conform to these contribution guidelines , which document two strategies:.

For partners implementing GKI, there might be valid reasons why out-of-tree patches are required especially if there are silicon schedules that must be met. For these cases, file a Buganizer issue. Submit GKI changes through Gerrit to the android-mainline branch first and then backported to other release branches as needed.

The source code associated with loadable modules doesn't need to be contributed to the GKI kernel source tree, however it's strongly recommended to submit all drivers to upstream Linux.

Upload the patch to Gerrit following the contribution guidelines. If the patch has been posted upstream, but hasn't yet been accepted, it's recommended to wait until it is accepted.

If the schedule doesn't permit waiting for the patch to be accepted upstream, file a Buganizer issue. If there's no accessible Buganizer project, then post the patch with the config change to Gerrit and make sure the commit message clearly states the reason the config is needed. Modifications to core kernel code in AOSP common kernels are discouraged. First send patches to upstream Linux and then backport them. If there's a good reason for a core kernel change, file a Buganizer issue clearly stating the request and the justification.

No Android-specific features are accepted without a Buganizer issue. Send an email to kernel-team android. Don't send patches upstream that contain only symbol exports. When sending patches upstream, the commit message must contain a clear justification for why the patch is needed and beneficial to the community. Enabling exports to benefit out-of-tree drivers or functionality isn't a persuasive argument to upstream maintainers.

If for some reason, the patch can't be sent upstream, file a Buganizer issue and explain why the patch can't be sent upstream. Generally, symbols that are the supported interface to a kernel subsystem are likely to be accepted as exports. However, random internal helper functions are unlikely to be accepted and you'll be asked to refactor your code to avoid using them. Refer to the symbol listing documentation for further details.

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Core Topics Architecture. Overview Architecture. Modular System Components. Modular Kernels. HIDL General. HIDL Java. ConfigStore HAL. Device Tree Overlays. Vendor NDK. Vendor Interface Object.

Core Concepts. Camera Features. Bluetooth and NFC. Calling and Messaging. ACTS Tests. Surface and SurfaceHolder. SurfaceFlinger and WindowManager.

Hardware Composer HAL. OpenGL ES. Neural Networks. Audio Accessories. USB Headset. Custom Accessories. Sensors HAL. Context Hub Runtime Environment.

Test Development Workflow. Instrumentation Tests. Native Tests. Android Test Station. Test Framework. VTS Dashboard. Lab Infrastructure. Getting Started. Testing with TF. Through Tradefed. Through Suite. Developing TF. XML Configuration. Global Configuration. Advanced Concepts. No more disturbing when you play games. Have an anterior enjoy of new Android operating system, PhotoSphere and other new features before they are released.

Install an app like One Cleaner which can automatically hibernate apps you are not using remove the junk files. Iroot Home. Download for PC Download for Android. Free Enjoy Devices Block the limitations of your Android device's access. Uninstall Preinstalled Apps Uninstall some useless apps that the manufacturers want to stay anytime.