Android 驱动（16）---AOSP如何单独build kernel

AOSP如何单独build kernel

解决方案

如果只是修改kernel 中单一模块，如何快速build kernel模块？

ARCH : 指的是所编译的类型 (arm 、arm64 或者x86)

project：指的是所要编译的Project name

1，build 对应的模块

cd kernel-3.10

mkdir out

make ARCH=arm64 O=out $project_defconfig

make ARCH=arm64 -j8 O=out [modules]

例如，build eccci module，

cd kernel-3.10

mkdir out

make ARCH=arm64 O=out $project_defconfig

make ARCH=arm64 -j8 O=out drivers/misc/mediatek/eccci/

生成image 文件，如果包含dtb(device tree)将下面命令中的Image换成Image.gz-dtb

make -j8 O=out Image （32bit 处理器请使用zImage 或者zImage-dtb）

如果要new 整个kernel ，请执行以下命令：

cd kernel-3.10

mkdir out

make ARCH=arm64 O=out $project_defconfig

make ARCH=arm64 -j8 O=out

(之前有new 过kernel ，再次new kernel 的时间大概为1分钟)

对于6752和6582平台需要加header，所以请继续执行2，4步

对于6795、6735等平台不需要加header，所以请继续执行3，4步

2，对生成image文件加header

Step1:将如下code存为mkimage.sh
Step2:将mkimage.sh放在alps/kernel目录，例如alps/kernel-3.10
Step3:执行:./mkimage.sh project_name target_arch [dtb]

Example:

support device tree:source mkimage.sh k6752v1_64 arm64 dtb

no support device tree:source mkimage.sh k6752v1_64 arm64

#!/bin/bash

if [ -z "$1" ]; then
    echo -e "\n[error]: project is empty ,you can input help."
    echo -e "example: source mkimage.sh help\n"
elif [ "$1" = "help" ]; then
    echo -e "\nUsage: mkimage.sh <project_name> <target_arch> <dtb> \n"
    echo "<project_name>: project name,eg: k6752v1_64"
    echo "<target_arch>: platform is arm or arm64,"
    echo -e "<dtb>: if support device tree,you can input to check\n"
    echo "eample:"
    echo "support device tree:source mkimage.sh k6752v1_64 arm64 dtb "
    echo -e "no support device:source mkimage.sh k6752v1_64 arm64\n"
else
project=$1
target_arch=$2
dtb=$3
if [ "$target_arch" = "arm" ]; then
    if [ "$dtb" = "dtb" ]; then
       target_prebuilt_kernel=out/arch/$target_arch/boot/zImage-dtb
    else
       target_prebuilt_kernel=out/arch/$target_arch/boot/zImage
    fi
else
    if [ "$dtb" = "dtb" ]; then
     target_prebuilt_kernel=out/arch/$target_arch/boot/Image.gz-dtb
    else
     target_prebuilt_kernel=out/arch/$target_arch/boot/Image.gz
    fi
fi
echo project=$project kernel image add header $target_prebuilt_kernel
../out/host/linux-x86/bin/mkimage $target_prebuilt_kernel KERNEL 0xffffffff > out/kernel.bin
cp out/kernel.bin ../out/target/product/$project/kernel
fi

3，将生成的image 移到out 目录并rename为kernel

Step1:将如下code存为mkimage.sh
Step2:将mkimage.sh放在alps/kernel目录，例如alps/kernel-3.10
Step3:执行:./mkimage.sh project_name [dtb]

Example:

support dtb:source mkimage.sh k6795v1_64 dtb

no support dtb:source mkimage.sh k6795v1_64

#!/bin/bash

echo $target_prebuilt_kernel
cp $target_prebuilt_kernel ../out/target/product/$project/kernel
fi

4, 快速打包boot image,

在alps 目录下执行：make bootimage-nodeps

注意：如果修改了rootfs里面的bin，可以按照下面步骤操作来加速：

§ mmm编译相应的module

§ make ramdisk-nodeps

§ make bootimage-nodeps

Android 驱动（16）---AOSP如何单独build kernel

解决方案

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