Thread: Linux Kernel Makefiles

  1. #1
    {Jaxom,Imriel,Liam}'s Dad Kennedy's Avatar
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    Linux Kernel Makefiles

    I want to distribute my make environment into several sub-dirs. These are modules to the kernel, but all the sub-dirs will be out-of-stream builds. I was attempting to mimic the way the Linux kernel build works, but something is seriously missing from these files. The main directory make file looks something like this:
    Code:
    ifeq ($(KERNELRELEASE), )
    KERNELDIR       ?= ../../../kernel/linux-2.6.24.5/linux-2.6.24.5
    ARCH            ?= arm
    CROSS_COMPILE   ?= arm-unknown-linux-gnueabi-
    PWD             := $(shell pwd)
    
    modules:
            $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
    
    else
    
    EXTRA_CFLAGS    += -I$(PWD)/include
    obj-y           += common/
    obj-y           += convert/
    obj-y           += drivers/
    
    endif
    One of the sub-dir Makefiles looks like this:
    Code:
    obj-y   += safe_inc.o
    obj-y   += callback.o safe_inc.o
    So, what am I doing wrong? Any ideas?

  2. #2
    {Jaxom,Imriel,Liam}'s Dad Kennedy's Avatar
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    Doh!!! I think I found it. I may need more work, but here is the bottom line:

    All the obj-y stuff, should be replaced with obj-m (Modules, man, Modules!!!!).

    I'll post more if I find more corrections.

  3. #3
    {Jaxom,Imriel,Liam}'s Dad Kennedy's Avatar
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    Code:
    ifeq ($(KERNELRELEASE), )
    KERNELDIR         ?= <path to kernel>
    ARCH              ?= <if you are using a different arch>
    CROSS_COMPILE     ?= <your cross compiler>
    PWD               := $(shell pwd)
    
    modules:
            @$(MAKE) MYPWD=$(PWD) -C $(KERNELDIR) M=$(PWD) modules
    
    clean:
            @rm -r *.o */*.o *.ko *.mod.c .*cmd */.*cmd .tmp_versions Module.symvers
    
    else
    EXTRA_CFLAGS      := -I$(MYPWD)/include
    
    obj-m             += mydriver.o
    mydriver-y        := drivers/mydriver.o
    mydriver-y        += common/some.o
    
    obj-m                   += mydriver2.o
    mydriver2-y       := drivers/mydriver2.o
    mydriver2-y       += common/callback.o
    mydriver2-y       += convert/mydriver2.o
    mydriver2-y       += common/mymemory.o
    mydriver2-y       += common/some.o
    
    #etc. . .
    
    endif

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