樹莓派驅動makefile編寫

外部環境編譯：

ifneq ($(KERNELRELEASE),)
obj-m := helloworld.o
else  
KDIR := /rk3288/raspberry/linux  #樹莓派內核源碼目錄
all:
	make -C $(KDIR) M=$(PWD) modules ARCH=arm CROSS_COMPILE=/tools/arm-bcm2708/arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
#交叉編譯工具的路徑
clean:  
	rm -f *.ko *.o *.mod.o *.mod.c *.symvers  modul*  
endif

樹莓派內部編譯：

1.更新一下完整的linux內核源碼

sudo apt-get update
sudo apt-get install raspberrypi-kernel-headers

2.Makefile 

ifneq ($(KERNELRELEASE),)
obj-m := helloworld.o
else  
KDIR := /usr/src/linux-headers-4.19.118-v7+/  #樹莓派內核源碼目錄
PWD := $(shell pwd)
all:
	make -C $(KDIR) M=$(PWD) modules
clean:
	rm *.o *.ko *.mod.c modules.order Module.symvers
.PHONY:clean
endif