EEPW论坛

在别人板子上没问题的，拿到我板子上，做了些地址上的相应修改后，在PC上交叉编译，通过NFS，mount上去后，insmod的时候，出现如下信息：
insmod: unresolved symbol unregister_chrdev
insmod: unresolved symbol register_chrdev
insmod: unresolved symbol printk
很是纳闷，哪位兄台能帮忙解决一下，感激不尽！
我现在纳闷到底问题出在什么地方？交叉编译器？驱动本身？板子上Linux内核问题？

代码如下：
#ifndef __KERNEL__
# define __KERNEL__
#endif
#ifndef MODULE
# define MODULE
#endif
#ifdef CONFIG_SMP
#define __SMP__
#endif
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <asm/unistd.h>
#include <asm/fcntl.h>
#include <asm/uaccess.h>
#include <asm-arm/arch-s3c2410/s3c2410.h>

MODULE_LICENSE("GPL";

#define LED_ON 333
#define LED_OFF 555

unsigned int LED_MAJOR=251; /*static define device major number*/

static int led_open(struct inode *inode, struct file *filp);
static ssize_t led_read(struct file *filp, char *buf, size_t count,loff_t *f_pos);
static ssize_t led_write(struct file *filp, const char *buf, size_t count,loff_t *f_pos);
static int led_ioctl(struct inode *inode,struct file *filp,unsigned int cmd,unsigned long arg);
static int led_release(struct inode *inode, struct file *filp);

struct file_operations led_fops={
open: led_open,
read: led_read,
write: led_write,
ioctl: led_ioctl,
release: led_release,
};

int led_init()
{
int result;
result=register_chrdev(LED_MAJOR, "led",&led_fops);
if (result < 0) {
printk("<1>Sorry,I can't get major number\n";
return result;
}
if (result==0){
printk("<1>The major is:%d\n",LED_MAJOR);
printk("<1>Init LED module successful!\n";
}
return 0;
}

static void led_exit()
{
unregister_chrdev(LED_MAJOR, "led";
printk("<1>LED module has been closed already.\n";
return;
}

void led_on(unsigned long index)
{
unsigned int data=0x10;
rGPFCON=0x5500;
rGPFUP=0x0;
rGPFDAT=data<<index;
/*
*portaddr=(data<<index);
*portdata&=~(data<<index);
*printk("portaddr=%-5d ",portaddr);
*printk("portdata=%-5d index=%-5d\n",portdata,index);
*/
return;
}

void led_off(unsigned long index)
{
unsigned int data=0x10;
rGPFCON=0x5500;
rGPFUP=0x0;
rGPFDAT=~(data<<index);
/*
*portaddr=(data<<index);
*portdata|=~(data<<index);
*printk("portaddr=%-5d ",portaddr);
*printk("portdata=%-5d index=%-5d\n",portdata,index);
*/
}

static int led_open(struct inode *inode,struct file *filp)
{
return 0;
}

static int led_read(struct file *filp,char *buf,size_t count,loff_t *f_pos)
{
return 0;
}

static int led_write(struct file *filp,const char *buf,size_t count,loff_t *f_pos)
{
return 0;
}

static int led_ioctl(struct inode *inode,struct file *filp,unsigned int cmd,unsigned long arg)
{
printk("<1>rogram now in kernel space,and cmd=%ld,arg=%ld.\n",cmd,arg);
switch(cmd){
case LED_ON:
{
unsigned idx;
/*if(copy_from_user(&idx,(unsigned long*)arg,sizeof(unsigned long))){
printk("<1>Sorry,copy_from_user() error!\n";
return -1;
} */
idx=arg;
led_on(idx);
break;
}
case LED_OFF:
{
unsigned long idx;
/*if(copy_from_user(&idx,(unsigned long*)arg,sizeof(unsigned long))){
printk("<1>led_off() copy_from_user error!\n";
return -1;
}*/
idx=arg;
led_off(idx);
if(idx==7)
printk("We have already finished the work.\n";
break;
}
default:
printk("<1>Unknown cmd!\n";
break;
}
}

static int led_release(struct inode *inode,struct file *filp)
{
return 0;
}

module_init(led_init);
module_exit(led_exit);[em07]