Kernel Module .ko 的Makefile

REF:http://wshlab2.ee.kuas.edu.tw/personal/simon/archives/000735.html

目前小弟常用的兩種寫法，敬供參考。

KERNEL_VERSION  := `uname -r`
KERNEL_DIR := /lib/modules/$(KERNEL_VERSION)/build
#KERNEL_DIR      := $(KERNEL_SRC)
CROSS_COMPILE   := arm-linux-


PWD     := $(shell pwd)

obj-m       := snd-dummy.o
snd-dummy-objs      := dummy.o

all: snd-dummy

snd-dummy:
@echo "Building a dummy driver..."
@(make -C $(KERNEL_DIR) M=$(PWD) CROSS_COMPILE=$(CROSS_COMPILE) modules)

clean:
-rm -f *.o *.ko .*.cmd .*.flags *.mod.c Module.symvers modules.order tags
-rm -rf .tmp_versions

ifneq   ($(KERNELRELEASE),)
obj-m   := dummy.o

else
KERNEL_VERSION  := `uname -r`
KERNEL_DIR := /lib/modules/$(KERNEL_VERSION)/build
#KERNEL_DIR      := $(KERNEL_SRC)
PWD     := $(shell pwd)
default:
      $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

clean:
      rm -r .tmp_versions *.mod.c .*.cmd *.o *.ko

endif