Linux内核——如何将驱动代码添加到内核源码树

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以字符设备驱动为例s

  1. 首先，把.c文件拷贝到/driver/char中要修改源码给目录下的/driver/char中的Kconfig文件，这样才能在编译内核时看到我们驱动的配置选单，参考其他的config 有样学样

    1678061581009

    tristate字段说明 该驱动有三个选项 y m n 。 y代表编译到内核里面，m是编程驱动.ko n是不编译。

  2. 接下来到内核源码根目录下执行，

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    /home/dawnlake/Downloads/linux-4.9.229$ make memuconfig

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查看help

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  1. 接下来需要修改/drivers/char目录下的makefile文件

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  1. 然后再回到内核源码根目录下执行，make

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    root@dawnlake-virtual-machine:/home/dawnlake/Downloads/linux-4.9.229$ make
    scripts/kconfig/conf  --silentoldconfig Kconfig
      CHK     include/config/kernel.release
      CHK     include/generated/uapi/linux/version.h
      CHK     include/generated/utsrelease.h
      CHK     include/generated/bounds.h
      CHK     include/generated/timeconst.h
      CHK     include/generated/asm-offsets.h
      CALL    scripts/checksyscalls.sh
      CHK     scripts/mod/devicetable-offsets.h
      CHK     include/generated/compile.h
      CC      drivers/char/helloDev.o
      LD      drivers/char/built-in.o
      LD      drivers/built-in.o
      LD      vmlinux.o
      MODPOST vmlinux.o
      GEN     .version
      CHK     include/generated/compile.h
      UPD     include/generated/compile.h
      CC      init/version.o
      LD      init/built-in.o
      KSYM    .tmp_kallsyms1.o
      KSYM    .tmp_kallsyms2.o
      LD      vmlinux
      SORTEX  vmlinux
      SYSMAP  System.map
      VOFFSET arch/x86/boot/compressed/../voffset.h
      CC      arch/x86/boot/compressed/misc.o
      OBJCOPY arch/x86/boot/compressed/vmlinux.bin
      GZIP    arch/x86/boot/compressed/vmlinux.bin.gz
      MKPIGGY arch/x86/boot/compressed/piggy.S
      AS      arch/x86/boot/compressed/piggy.o
      LD      arch/x86/boot/compressed/vmlinux
    ld: arch/x86/boot/compressed/head_64.o: warning: relocation in read-only section `.head.text'
    ld: warning: creating DT_TEXTREL in a PIE
      ZOFFSET arch/x86/boot/zoffset.h
      AS      arch/x86/boot/header.o
      CC      arch/x86/boot/version.o
      LD      arch/x86/boot/setup.elf
      OBJCOPY arch/x86/boot/setup.bin
      OBJCOPY arch/x86/boot/vmlinux.bin
      BUILD   arch/x86/boot/bzImage
    Setup is 15580 bytes (padded to 15872 bytes).
    System is 6681 kB
    CRC 959cc45
    Kernel: arch/x86/boot/bzImage is ready  (#2)
      Building modules, stage 2.
      MODPOST 18 modules

    现在内核启动时候就会自动加载我们的hello驱动，如果在menuconfig设置m而不是y（*） ，就会只生成.ko文件而不是直接加载，需要手动插入。