OpenHarmony中Linux内核手动编译调试解读-linux内核编译

一、OpenHarmony手动编译Linux内核

1.首次编译标准系统

./build.sh --product-name Hi3516DV300 --ccache

2.编译完成在编译的内核

在OpenHarmony-v3.1-Beta/out/KERNEL_OBJ/kernel/src_tmp/linux-5.10目录下

配置编译环境变量

export OHOS_ROOT=/home/weimin/OpenHarmony/OpenHarmony-v3.1-Beta
export PATH=$OHOS_ROOT/prebuilts/clang/ohos/linux-x86_64/llvm/bin:$PATH
export PATH=$OHOS_ROOT/prebuilts/gcc/linux-x86/arm/gcc-linaro-7.5.0-arm-linux-gnueabi/bin:$PATH
export MAKE_OPTIONS="ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- CC=clang HOSTCC=clang"
export PRODUCT_PATH=vendor/hisilicon/Hi3516DV300

编译内核

make ${MAKE_OPTIONS} menuconfig hi3516dv300_standard_defconfig
或者
make ${MAKE_OPTIONS} menuconfig hi3516dv300_small_defconfig
make ${MAKE_OPTIONS} uImage

编译完成在out/KERNEL_OBJ/kernel/src_tmp/linux-5.10/arch/arm/boot目录下生成uImage，zImage-dtb，zImage和Image等镜像文件。

二、手动打包ramdisk镜像

进入ramdisk的文件目录执行如下命令：

进入ramdisk的文件目录执行如下命令：
find . | cpio -c -o -v |gzip  >../ramdisk.img

三、打包ramdisk.img和zImage-dtb生成boot.img

ohos.its文件内容如下：

/dts-v1/;

/ {
    description = "U-Boot uImage source file for Hi3516DV300";
    #address-cells = <1>;

    images {
        kernel@1 {
            description = "Linux kernel for Hi3516DV300";
            data = /incbin/("./zImage-dtb");
            type = "kernel";
            arch = "arm";
            os = "linux";
            compression = "none";
            load = <0x82000000>;
            entry = <0x82000000>;
        };
        ramdisk@1 {
            description = "ohos Ramdisk Image";
            data = /incbin/("./ramdisk.img");
            type = "ramdisk";
            arch = "arm";
            os = "linux";
            compression = "none";
            load = <0x84000000>;
            entry = <0x84000000>;
        };
    };

    configurations {
        default = "conf@boot";
        conf@boot {
            description = "booting ARM Linux Kernel Image";
            kernel = "kernel@1";
            ramdisk = "ramdisk@1";
        };
    };
};

data = /incbin/(“./zImage-dtb”);指定zImage文件的路径

data = /incbin/(“./ramdisk.img”); 指定ramdisk文件的路径

如果ohos.its没有修改，将ohos.its、ramdisk.img和zImage-dtb文件放入同一目录下，执行下面命令生成boot.img:

mkimage -f ohos.its boot.img

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