Makefile for simple linux device driver

Thank you again.

the tip the taps took me a step nearer to the goal.. but it still get a syntax error about '-O', it shows me, that in the syntax list isn't an option with cap O but only a tiny 'o' (this time i did a copy&paste to insert your makefile).

After all, i'm still not able build the module (by the way... setting enviromental vars ARCH and CROSS_COMPILE in your makefile doesnt work. It works if i set it in the build command line in the 'Create new make target' menu option.)

With these modification and your suggested make command...

       $(MAKE) -C $(KERNELDIR) M=`pwd` O=$(BUILDDIR) -o $@

...i get:

 Nothing to be done for all

After deleting $@ and trying again i get the following output:

make ARCH=nios2nommu CROSS_COMPILE=nios2-elf- all 
make  -C /cygdrive/d/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.kernel_1.4.0/linux-2.6.x M=`pwd` 
O=/cygdrive/d/MyKernel/build -o all
make: Entering directory `/cygdrive/d/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.kernel_1.4.0/linux
-2.6.x'
  no emulation specific options.
  LD      /cygdrive/d/MyModule/built-in.o
  CC   /cygdrive/d/MyModule/mymodule.o
/cygdrive/d/MyModule/.mymodule.o.d: done.
  Building modules, stage 2.
  MODPOST
Signal 11
make: ***  Error 139
make: ***  Error 2
make: ***  Error 2
make: Leaving directory `/cygdrive/d/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.kernel_1.4.0/linux-
2.6.x'
make: ***  Error 2

In addition the build process adds following files and directories to my project folder:

- a mymodule.o file

- a buit-in.o

- a .built-in.o.cmd file

- a .mod.o.cmd file

- a '.tmp_versions' directory with a 'mymodule.mod' file

Maybe I do every possible mistake, that can be done?