树莓派驱动开发 helloworld

编写Makefile

ifneq ($(KERNELRELEASE),)  

obj-m := MiniX.o  

else  

KDIR := /home/hi/pi/kernel/linux/
all:
	make -C $(KDIR) M=$(PWD) modules ARCH=arm CROSS_COMPILE=/home/hi/pi/kernel/RpiTools/arm-bcm2708/arm-bcm2708hardfp-linux-gnueabi/bin/arm-bcm2708hardfp-linux-gnueabi-  

clean:
	rm -f *.ko *.o *.mod.o *.mod.c *.symvers  modul*  

endif

编写main.c

#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>

MODULE_LICENSE("Dual BSD/GPL");

static int hello_init(void)
{
    printk(KERN_ALERT"Hello, world\n");
    return 0;
}

static void hello_exit(void)
{
    printk(KERN_ALERT"Goodbye, cruel world\n");
}

module_init(hello_init);
module_exit(hello_exit);