我编译的内核出现unable to handle kernel NULL pointer dereference at virtual address 00000018,这是什么原因呀

代码里引用了空指针

在mini2440_machine_init函数中添加平台的数据信息！！！

static void __init mini2440_machine_init(void){
s3c24xx_fb_set_platdata(&mini2440_fb_info);
s3c_i2c0_set_platdata(NULL);
s3c_device_nand.dev.platform_data = &mini2440_nand_info;  //添加后，编译下载，启动成功
platform_add_devices(mini2440_devices, ARRAY_SIZE(mini2440_devices));
}