help on BUILD

Hi, gurus:

I need to generate .o file for a device driver, such as help_drv.o for HELP
device driver. But I don’t know how to do it. Is there anyone have similar
experience to mine? When I BUILD -cef, it only generates a .sys file and
lots of .obj files, but how to get a single .o file is what I don’t know.
Thanks.

Z.S. Wang