添加设备驱动问题 设备, 驱动

lichunguang

我在nios2下嵌入linux，并试着加载设备驱动，现在正是这拿helloworld这个简单模块来熟悉添加设备模块的整个过程，可是怎么也build不过去，显示一下错误：
make -k all
  no emulation specific options.
make -C ../test_kernel/build/ M='pwd'  KBUILD_OUTPUT='pwd'   ARCH=nios2  CROSS_COMPILE=nios2-elf- modules
make[1]: Entering directory `/cygdrive/d/OC1225/Development/Sample/Hardware/EP2C20/test_kernel/build'
make -C /cygdrive/c/altera/kits/nios2_60/bin/eclipse/plugins/com.microtronix.nios2linux.kernel_1.4.0/linux-2.6.x O=/cygdrive/d/OC1225/Development/Sample/Hardware/EP2C20/test_kernel/build modules
cd: can't cd to pwd
make: *** pwd: No such file or directory.  Stop.
make[2]: *** [modules] Error 2
make[1]: *** [modules] Error 2
make[1]: Leaving directory `/cygdrive/d/OC1225/Development/Sample/Hardware/EP2C20/test_kernel/build'
make: *** [all] Error 2
希望那位高手指点一下。万分感谢
其中MAKEFILE如下：
#
# configurable options
#  - set DEBUG = 1 to turn on debugging support
#
DEBUG = 0
PROJ_NAME = helloworld
INSTALL_DIR =
PROGS := $(PROJ_NAME).o
CFLAGS +=

#
# You should not need to modify anything beyond this point
#
TOPDIR = .
include $(TOPDIR)/Rules.mak

# linux path ----- ?????
LINUXPATH = ../test_kernel/build/
CURDIR='pwd'
KBUILD_OUTPUT=$(CURDIR)
ARCH=nios2

obj-m := $(PROGS)

all:
    $(MAKE) -C $(LINUXPATH) M=$(CURDIR) KBUILD_OUTPUT=$(KBUILD_OUTPUT) ARCH=$(ARCH) CROSS_COMPILE=nios2-elf- modules
   
clean:
    rm -f *.o *.mod.o *.mod.c *.ko *.cmd