linux 2.6下编译最简单的hello.ko驱动

linux 2.6下编译最简单的hello.ko驱动

1.下载kernel源码 http://
2.配置内核
luther@gliethttp:~/work/kernel/linux-2.6.22.14$ make oldconfig
luther@gliethttp:~/work/kernel/linux-2.6.22.14$ make prepare
luther@gliethttp:~/work/kernel/linux-2.6.22.14$ make scripts 否则提示：MODPOST 1 modules /bin/sh: scripts/mod/modpost: not found
3.写测试程序hello.c
//luther@gliethttp:~/work/kernel/module_drivers/hello$ vim hello.c
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

static int init_hello_4(void)
{
   printk(KERN_ALERT "Hello, world 4 ");
   return 0;
}

static void cleanup_hello_4(void)
{
   printk(KERN_ALERT "Goodbye, world 4 ");
}

module_init(init_hello_4);
module_exit(cleanup_hello_4);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Playmud");
MODULE_DESCRIPTION("Test only!");
4.配置Makefile和执行ko编译
luther@gliethttp:~/work/kernel/module_drivers/hello$ echo "obj-m:=hello.o" > Makefile
luther@gliethttp:~/work/kernel/module_drivers/hello$ make -C /usr/src/`uname -r` M=`pwd` modules
我下载的内核位置为~/work/kernel/linux-2.6.22.14,所以这里指定为：
luther@gliethttp:~/work/kernel/module_drivers/hello$ make -C ../../linux-2.6.22.14 M=`pwd` modules
make: Entering directory `/home/luther/work/kernel/linux-2.6.22.14'

  WARNING: Symbol version dump /home/luther/work/kernel/linux-2.6.22.14/Module.symvers
           is missing; modules will have no dependencies and modversions.

  Building modules, stage 2.
  MODPOST 1 modules
  CC /home/luther/work/kernel/module_drivers/hello/hello.mod.o
  LD [M] /home/luther/work/kernel/module_drivers/hello/hello.ko
make: Leaving directory `/home/luther/work/kernel/linux-2.6.22.14'
luther@gliethttp:~/work/kernel/module_drivers/hello$


上面的做法当然是可以，但是老是提示：
WARNING: Symbol version dump /home/luhter/work/kernel/linux-2.6.22.14/Module.symvers is missing; modules will have no dependencies and modversions.

通过摸索，原来，编译hello.ko其实是非常简单的，不用下载kernel源码，
写测试程序hello.c
//luther@gliethttp:~/work/kernel/module_drivers/hello$ vim hello.c
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

static int init_hello_4(void)
{
   printk(KERN_ALERT "Hello, world 4 ");
   return 0;
}

static void cleanup_hello_4(void)
{
   printk(KERN_ALERT "Goodbye, world 4 ");
}

module_init(init_hello_4);
module_exit(cleanup_hello_4);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Playmud");
MODULE_DESCRIPTION("Test only!");
4.配置Makefile和执行ko编译
luther@gliethttp:~/work/kernel/module_drivers/hello$ echo "obj-m:=hello.o" > Makefile
luther@gliethttp:~/work/kernel/module_drivers/hello$ make -C /lib/modules/`uname -r`/build M=`pwd` modules
make: Entering directory `/usr/src/linux-headers-2.6.22-14-generic'
  CC [M]  /home/luther/work/kernel/module_drivers/hello/hello.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /home/luther/work/kernel/module_drivers/hello/hello.mod.o
  LD [M]  /home/luther/work/kernel/module_drivers/hello/hello.ko
make: Leaving directory `/usr/src/linux-headers-2.6.22-14-generic'
luther@gliethttp:~/work/kernel/module_drivers/hello$

/lib/modules/`uname -r`/build就是本地ubuntu机子的module编译配置目录

不是为正在运行的内核编译模块：
make -C M='pwd'
为正在运行的内核编译模块:
make -C /lib/modules/'uname -r'/build M='pwd'
不用下载kernel，直接就在本地机搞定了！

printk没有在console上打印出提示，通过
luther@gliethttp:~/work/kernel/module_drivers/hello$ dmesg |tail
可以查到，具体配置可以查看
luther@gliethttp:~/work/kernel/module_drivers/hello$ vim /etc/syslog.conf