LG V40 官10内核编译记录

好久没更新文章了，一直加班加班加班，回家躺着就啥都不想干了。
今天难得下班早，想着优化一下手机系统，顺便折腾下内核，大概记录下过程吧。

配置java环境
百度下载一个jdk mac版本，我就下了个jdk1.8，直接安装就完事了。
装好后配置下环境
输入 /usr/libexec/java_home 查看JDK的安装位置

/Library/Java/JavaVirtualMachines/jdk1.8.0_261.jdk/Contents/Home

配置JDK
在~/.bash_profile文件中配置JDK环境
输入nano ~/.bash_profile
然后在.bash_profile中加入你的java安装位置，就是上面获取的那个地址

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_261.jdk/Contents/Home
export JAVA_HOME=$JAVA_HOME

这样就完事儿了。
在用brew安装个gcc编辑器，准备工作应该就差不多了。

现在看下官方的文档

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1. Android build

   • Download original android source code ( android-10.0.0_r15 ) from http://source.android.com ( $repo init -u
     https://android.googlesource.com/platform/manifest -b

android-10.0.0_r15

$repo sync -cdq -j12 --no-tags
$repo start android-10.0.0_r15 --all   )
   

• Then, merge the source into the android source code
• Run following scripts to build android
  a) source build/envsetup.sh

b) lunch 1
c) make -j4

• When you compile the android source code, you have to add google original prebuilt source(toolchain) into the android directory.
• After build, you can find output at out/target/product/generic

1. Kernel Build

   • Uncompress using following command at the android directory

   a) tar -xvzf *_Kernel_Q.tar.gz

   • When you compile the kernel source code, you have to add google original "prebuilt" source(toolchain) into the android directory.

   • Run following scripts to build kernel

     a)cd kernel/msm-4.9     b)mkdir -p out    c)export CROSS_COMPILE=../../../prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-

     d)make ARCH=arm64 O=./out judypn_lao_com-perf_defconfig e)make

ARCH=arm64 O=./out KERNEL_COMPRESSION_SUFFIX=gz -j16

     * "-j16" : The number, 16, is the number of multiple jobs to be invoked simultaneously.
- After build, you can find the build image(Image) at kernel/msm-4.9/out/arch/arm64/boot

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