背景

在Ubuntu18.04中編譯小米官方內核K30U的內核，環境配置等。

Redmi K30S Ultra Android Q LA.UM.8.12.r1-10600-sm8250.0 apollo-q-oss

代碼下載

aosp@ubuntu:~$ git clone https://github.com/MiCode/Xiaomi_Kernel_OpenSource.git -b apollo-q-oss --depth=1
Cloning into 'Xiaomi_Kernel_OpenSource'...
remote: Enumerating objects: 68787, done.
remote: Counting objects: 100% (68787/68787), done.
remote: Compressing objects: 100% (63208/63208), done.
remote: Total 68787 (delta 5893), reused 43525 (delta 4616), pack-reused 0
Receiving objects: 100% (68787/68787), 186.20 MiB | 10.48 MiB/s, done.
Resolving deltas: 100% (5893/5893), done.
Checking out files: 100% (64788/64788), done.
aosp@ubuntu:~$

查看內核配置文件

aosp@ubuntu:~/Xiaomi_Kernel_OpenSource$ cd arch/arm64/configs/
aosp@ubuntu:~/Xiaomi_Kernel_OpenSource/arch/arm64/configs$ ll
total 52
drwxrwxr-x  3 aosp aosp  4096 Sep  2 08:31 ./
drwxrwxr-x 12 aosp aosp  4096 Sep  2 08:31 ../
lrwxrwxrwx  1 aosp aosp    28 Sep  2 08:31 apollo_user_defconfig -> vendor/apollo_user_defconfig
-rw-rw-r--  1 aosp aosp 11759 Sep  2 08:31 cuttlefish_defconfig
-rw-rw-r--  1 aosp aosp 16696 Sep  2 08:31 defconfig
-rw-rw-r--  1 aosp aosp  7579 Sep  2 08:31 ranchu64_defconfig
drwxrwxr-x  2 aosp aosp  4096 Sep  2 08:31 vendor/
aosp@ubuntu:~/Xiaomi_Kernel_OpenSource/arch/arm64/configs$ cd vendor/
aosp@ubuntu:~/Xiaomi_Kernel_OpenSource/arch/arm64/configs/vendor$ ll
total 108
drwxrwxr-x 2 aosp aosp  4096 Sep  2 08:31 ./
drwxrwxr-x 3 aosp aosp  4096 Sep  2 08:31 ../
-rw-rw-r-- 1 aosp aosp 18629 Sep  2 08:31 apollo_user_defconfig
-rw-rw-r-- 1 aosp aosp 19847 Sep  2 08:31 kona_defconfig
-rw-rw-r-- 1 aosp aosp 17450 Sep  2 08:31 kona-perf_defconfig
-rw-rw-r-- 1 aosp aosp 19215 Sep  2 08:31 lito_defconfig
-rw-rw-r-- 1 aosp aosp 17376 Sep  2 08:31 lito-perf_defconfig
aosp@ubuntu:~/Xiaomi_Kernel_OpenSource/arch/arm64/configs/vendor$

這里找到我們編譯的內核配置文件是apollo_user_defconfig

環境

clang環境

aosp@ubuntu:~$ clang --version
Android (6443078 based on r383902) clang version 11.0.1 (https://android.googlesource.com/toolchain/llvm-project b397f81060ce6d701042b782172ed13bee898b79)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/aosp/clang/bin
aosp@ubuntu:~$

sudo apt-get install libncurses5-dev libncurses-dev libssl-dev device-tree-compiler bc cpio lib32ncurses5-dev lib32z1 build-essential binutils bc bison build-essential ccache curl flex g++-multilib gcc-multilib git gnupg gperf imagemagick lib32ncurses5-dev lib32readline-dev lib32z1-dev liblz4-tool libncurses5 libncurses5-dev libsdl1.2-dev libssl-dev libxml2 libxml2-utils lzop pngcrush rsync schedtool squashfs-tools xsltproc zip zlib1g-dev git

上面是基礎環境。直接安裝，遇到選擇y的就輸入y，回車。

cd ~
git clone https://github.com/LineageOS/android_prebuilts_gcc_linux-x86_aarch64_aarch64-linux-android-4.9 aarch64-linux-android-4.9 --depth=1
git clone https://github.com/LineageOS/android_prebuilts_gcc_linux-x86_arm_arm-linux-androideabi-4.9 arm-linux-androideabi-4.9 --depth=1

下載好編譯工具。clang工具也下載好，放同目錄。

sudo chmod -R 777 clang
cd clang/bin
export PATH=$(pwd):$PATH

開始編譯

在k30u的內核目錄中執行以下命令開始生成配置文件。

aosp@ubuntu:~/Xiaomi_Kernel_OpenSource$ make -j$(nproc) -C $(pwd) O=$(pwd)/out CROSS_COMPILE=$HOME/aarch64-linux-android-4.9/bin/aarch64-linux-android- CLANG_TRIPLE=aarch64-linux-gnu- CROSS_COMPILE_ARM32=$HOME/arm-linux-androideabi-4.9/bin/arm-linux-androideabi- ARCH=arm64 SUBARCH=arm64 LLVM=1 CC=clang apollo_user_defconfig
make: Entering directory '/home/aosp/Xiaomi_Kernel_OpenSource'
make[1]: Entering directory '/home/aosp/Xiaomi_Kernel_OpenSource/out'
  HOSTCC  scripts/basic/fixdep
  GEN     ./Makefile
  HOSTCC  scripts/kconfig/conf.o
  YACC    scripts/kconfig/zconf.tab.c
  LEX     scripts/kconfig/zconf.lex.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
drivers/misc/Kconfig:578:warning: config symbol defined without type
drivers/misc/Kconfig:583:warning: config symbol defined without type
drivers/misc/Kconfig:616:warning: config symbol defined without type
#
# configuration written to .config
#
make[1]: Leaving directory '/home/aosp/Xiaomi_Kernel_OpenSource/out'
make: Leaving directory '/home/aosp/Xiaomi_Kernel_OpenSource'
aosp@ubuntu:~/Xiaomi_Kernel_OpenSource$

成功之后開始編譯內核：

aosp@ubuntu:~/Xiaomi_Kernel_OpenSource$ make -j$(nproc) -C $(pwd) O=$(pwd)/out CROSS_COMPILE=$HOME/aarch64-linux-android-4.9/bin/aarch64-linux-android- CLANG_TRIPLE=aarch64-linux-gnu- CROSS_COMPILE_ARM32=$HOME/arm-linux-androideabi-4.9/bin/arm-linux-androideabi- ARCH=arm64 SUBARCH=arm64 CC=clang LLVM=1
make: Entering directory '/home/aosp/Xiaomi_Kernel_OpenSource'
make[1]: Entering directory '/home/aosp/Xiaomi_Kernel_OpenSource/out'
  GEN     ./Makefile
  WRAP    arch/arm64/include/generated/uapi/asm/errno.h
  WRAP    arch/arm64/include/generated/uapi/asm/ioctl.h
  WRAP    arch/arm64/include/generated/uapi/asm/ipcbuf.h
  WRAP    arch/arm64/include/generated/uapi/asm/kvm_para.h
  WRAP    arch/arm64/include/generated/uapi/asm/mman.h
  WRAP    arch/arm64/include/generated/uapi/asm/msgbuf.h


....


  CC      net/bridge/br_netfilter.mod.o
  LD [M]  drivers/media/platform/msm/broadcast/tspp.ko
  LD [M]  drivers/media/platform/msm/dvb/adapter/mpq-adapter.ko
  LD [M]  drivers/video/backlight/lcd.ko
  LD [M]  drivers/media/usb/gspca/gspca_main.ko
  LD [M]  drivers/char/rdbg.ko
  LD [M]  drivers/media/platform/msm/dvb/demux/mpq-dmx-hw-plugin.ko
  LD [M]  net/bridge/br_netfilter.ko
  LD [M]  drivers/soc/qcom/llcc_perfmon.ko
make[1]: Leaving directory '/home/aosp/Xiaomi_Kernel_OpenSource/out'
make: Leaving directory '/home/aosp/Xiaomi_Kernel_OpenSource'
aosp@ubuntu:~/Xiaomi_Kernel_OpenSource$

大概十分鐘這樣編譯完成。

aosp@ubuntu:~/Xiaomi_Kernel_OpenSource$ ls out/
arch/                ipc/                 security/            .tmp_vmlinux1
block/               kernel/              sound/               .tmp_vmlinux2
built-in.a           lib/                 source/              usr/
certs/               Makefile             System.map           .version
.config              .missing-syscalls.d  techpack/            virt/
crypto/              mm/                  .tmp_kallsyms1.o     vmlinux
drivers/             modules.builtin      .tmp_kallsyms1.S     .vmlinux.cmd
firmware/            modules.order        .tmp_kallsyms2.o     vmlinux.o
fs/                  Module.symvers       .tmp_kallsyms2.S     
include/             net/                 .tmp_System.map      
init/                scripts/             .tmp_versions/       
aosp@ubuntu:~/Xiaomi_Kernel_OpenSource$ ls out/arch/arm64/boot/
dts  Image
aosp@ubuntu:~/Xiaomi_Kernel_OpenSource$
aosp@ubuntu:~/Xiaomi_Kernel_OpenSource/out/arch/arm64/boot$ ls -l
total 34952
drwxrwxr-x 29 aosp aosp     4096 Sep  2 08:38 dts
-rw-rw-r--  1 aosp aosp 37941260 Sep  2 08:42 Image
aosp@ubuntu:~/Xiaomi_Kernel_OpenSource/out/arch/arm64/boot$

在out/arch/arm64/boot/目錄下有Image文件，這個文件重新使用magiskbook重新打包就可以生成boot.img了。

通過臨時啟動內核方式刷入，驗證是否正常，如果正常就flash進去。

審核編輯：劉清