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kandi X-RAY | android_kernel_oneplus_sdm845 Summary
kandi X-RAY | android_kernel_oneplus_sdm845 Summary
these are the release notes for linux version 4. read them carefully, as they tell you what this is all about, explain how to install the kernel, and what to do if something goes wrong. linux is a clone of the operating system unix, written from scratch by linus torvalds with assistance from a loosely-knit team of hackers across the net. it aims towards posix and single unix specification compliance. it has all the features you would expect in a modern fully-fledged unix, including true multitasking, virtual memory, shared libraries, demand loading, shared copy-on-write executables, proper memory management, and multistack networking including ipv4 and ipv6. it is distributed under the gnu general public license - see the accompanying copying file for more details. on what hardware does it run?. although originally developed first for
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QUESTION
I am trying to learn the kernel customization and for this I have target OnePlus 6T device. I am able to compile the kernel source code on my Ubuntu 18 with the following steps:
- Download latest dtc from https://packages.ubuntu.com/cosmic/a...piler/download and install it.
- Clone kernel source code: git clone https://github.com/OnePlusOSS/androi...lus_sdm845.git
- Clone ToolChain: git clone -b linaro-4.9-arm-linux-androideabi https://github.com/ArchiDroid/Toolchain prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-linaro-4.8
- Open terminal at prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-linaro-4.9 and run: export CROSS_COMPILE=$(pwd)/bin/aarch64-linux-android-
- Navigate to kernel source code path in the same terminal.
- export ARCH=arm64 && export SUBARCH=arm64
- make clean
- make mrproper
- mkdir Out
- make O=Out sdm845_defconfig
- make O=Out DTC_EXT=dtc CONFIG_BUILD_ARM64_DT_OVERLAY=y DTC_EXT=dtc -j4
Following are the last lines of compilation:
...ANSWER
Answered 2019-Jun-17 at 09:46- A/B OTA update Firstly, you need to confirm whether your phone is A/B OTA update or not by following command fastboot getvar slot-count If the command returns '2', then your phone supports A/B OTA update which means you have two boot partitions 'boot_a' and 'boot_b', otherwise, there should only be one partition 'boot'
- boot image The images you built (Image.gz-dtb) are just kernel images with device tree. They are not enough for flashing to boot partition since there should be ramdisk and boot arguments combined. The ramdisk content contains normal boot binaries for non-A/B OTA system or recovery binaries for A/B OTA system. You need to find official ramdisk images and combine with your kernel image. Normally mkbootimg will be used to create boot image in AOSP android.
Flashing fastboot flash boot boot.img This works on both A/B and non-A/B system since image will be flashed to default active partition (boot_a is by default if you do not have OTA or using 'fastboot set_active' to change it) On A/B system, you can also use 'fastboot getvar current-slot' to get active slot and specific flash partition 'fastboot flash boot_a boot.img' or 'fastboot flash boot_b boot.img' XDA provides scripts to flash kernel images (Image.gz-dtb) with following steps: a. Dump boot.img from your phone b. Extract ramdisk.img from boot.img c. Combine Image.gz-dtb with ramdisk.img to new boot.img d. Flash new boot.img to boot partition
https://forum.xda-developers.com/oneplus-6t/development/kernel-holydragon-t3878107 provides customized kernel and flash scripts, you should check and find your suitable way to flash your kernel image.
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