Android 驱动（16）---AOSP如何单独build kernel

怼烎@ 2022-05-18 01:36 680阅读 0赞

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