linux驱动学习（1）环境及hello world程序

2011年4月19日

20:30

驱动开发使用的是tq2440的开发板，linux内核版本为linux-2.6.30.4。

首先解压linux源码，拷贝配置文件cp -f config_EmbedSky_W35_256MB .config （否则会出现version magic '2.6.30.4 mod_unload modversions ARMv5 ' should be '2.6.30'的版本错误）

Make distclean

Make oldconfig

Make

之后就可以编译hello驱动文件了

[xiaoyang@localhost Hello]$ make modules

make -C /opt/EmbedSky/linux-2.6.30.4 M=/opt/EmbedSky/apps/my-driver/Hello modules

make[1]: Entering directory `/opt/EmbedSky/linux-2.6.30.4'

WARNING: Symbol version dump /opt/EmbedSky/linux-2.6.30.4/Module.symvers

is missing; modules will have no dependencies and modversions.

CC [M] /opt/EmbedSky/apps/my-driver/Hello/hello.o

/opt/EmbedSky/apps/my-driver/Hello/hello.c:17: warning: function declaration isn't a prototype

Building modules, stage 2.

MODPOST 1 modules

CC /opt/EmbedSky/apps/my-driver/Hello/hello.mod.o

LD [M] /opt/EmbedSky/apps/my-driver/Hello/hello.ko

make[1]: Leaving directory `/opt/EmbedSky/linux-2.6.30.4'

[xiaoyang@localhost Hello]$ 4

Hello.c代码：

//----------------------------------------------------------

// xiaoyang@2011.4.19

// hello module

//----------------------------------------------------------

#include <linux/init.h>

#include <linux/module.h>

MODULE_LICENSE("Dual BSD/GPL");

static int hello_init(void)

{

printk("hello,xiaoyang!\n");

return 0;

}

static void hello_exit()

{

printk(KERN_ALERT "goodbye,xiaoyang!\n");

}

module_init(hello_init);

module_exit(hello_exit);

Makefile:

KERNELDIR=/opt/EmbedSky/linux-2.6.30.4

PWD:=$(shell pwd)

INSTALLDIR=/opt/EmbedSky/linux-2.6.30.4/mydriver

#CROSS_COMPILE=/opt/EmbedSky/crosstools_3.4.5_softfloat/gcc-3.4.5-glibc-2.3.6/arm-linux/bin/arm-linux-

CROSS_COMPILE=arm-linux-

CC=$(CROSS_COMPILE)gcc

obj-m := hello.o

modules:

$(MAKE) -C $(KERNELDIR) M=$(PWD) modules

modules_install:

cp hello.ko $(INSTALLDIR)

clean:

rm -rf *.o *.ko *.mod.c *.markers *.order *.symvers

 

.PHONY:modules modules_install clean

实验截图：