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This article mainly introduces the Android7.1 system compilation method is what the relevant knowledge, the content is detailed and easy to understand, the operation is simple and fast, with a certain reference value, I believe you will have something to gain after reading this Android7.1 system compilation method, let's take a look at it.

The Android source code needs to be decompressed under Windows to get a separate 4418/6818-android7.1-20191121.tar.gz package.

Copy 4418-android7.1-20191121.tar.gz to Ubuntu and extract it to get the nexell_nougat_r2 folder.

Note: it takes about 60 gigabytes to compile the Android7.1 source code.

10.1 build a compilation environment

10.1.1 missing dtc

Install the dtc compilation tool:

Apt-get install device-tree-compiler

10.1.2 openjdk version issu

Install Openjdk1.8:

Add-apt-repository ppapenjdk-r/ppa

Apt-get update

Apt-get install openjdk-8-jdk

Switch JDK in multiple JDK versions:

Update-alternatives-config java

Update-alternatives-config javac

Update-alternatives-config javadoc

Check the version number: java-version

10.2 Android7.1 source code compilation

Note: when compiling Android, you must ensure that more than 4G memory is provided to the Ubuntu system. Here, "providing more than 4G memory" means more than just setting up the allocation of 4G memory in the VMware Workstations virtual machine. For example, when users compile, the total memory of the PC machine is 6G, and 4G memory is allocated in the virtual machine, but in the Windows system, with QQ, antivirus software, music player, browser, etc., so that the memory occupied under Windows is almost 2G, then the virtual machine is automatically adjusted to occupy only 3G or even less 3G memory, so it may not be able to compile through. Later, compiling Android separately also requires more than 4G memory.

The correct way to allocate memory is to first allocate more than 4 gigabytes of memory to the virtual machine, then turn off as many unnecessary applications as possible under Windows, and shut down the background programs for as many applications as possible. Of course, if the user's PC is 8 gigabytes or 16 gigabytes of memory, whatever you want.

There are compiled scripts in the nexell_nougat_r2 directory. As shown in the following figure:

Compiling script execution is selected according to different core boards and different memory. 4418 script compilation commands:

. / 4418_create_1G.sh android

. / 4418_create_1G.sh qt

. / 4418_create_1G.sh Ubuntu

Android source code compilation process:

Android compilation completes the generation of the result-s5p4418-topeet4418_ref folder under nexell_nougat_r2. It contains images that need to be compiled.

10.3 Kernel configuration file

4418 path: there are different configuration files under nexell_nougat_r2/kernel/arch/arm/configs

There are configuration files for Android, qt, and Ubuntu, and a configuration file for Android is required to compile Android. Execute the command:

Cp s5p4418_topeet4418_ref_nougat_defconfig-android s5p4418_topeet4418_ref_nougat_defconfig

Then execute the following command

Export ARCH=arm

Make s5p4418_topeet4418_ref_nougat_defconfig

In particular, if the user wants to configure the default file using menuconfig, enter "export ARCH=arm" in the console before using the menuconfig tool.

10.4 modify the screen

I. uboot modification

4418 documents:

Nexell_nougat_r2/device/nexell/u-boot/u-boot-2016.01/arch/arm/dts/s5p4418-topeet4418-ref.dts

II. Kernel modification

Kernel device tree modification

4418 documents:

Nexell_nougat_r2/kernel/arch/arm/boot/dts/s5p4418-topeet4418_ref-common.dtsi

At the beginning of the file, there is a macro definition about the screen size, and different macro definitions are selected according to different screens.

III. Kernel configuration

Choose different kernel configurations according to different systems and screen sizes, and go to the kernel directory for execution

Export ARCH=arm

Make menuconfig

4.3 inch screen configuration:

Device Drivers->

Input device support->

This is the end of the article on "what is the method of compiling Android7.1 system?" Thank you for reading! I believe that everyone has a certain understanding of the knowledge of "what is the method of compiling Android7.1 system". If you want to learn more knowledge, you are welcome to follow the industry information channel.

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