Trying to compile GPIO driver as a kernel module with the Leopardboard 355 - Leopardboard 355 - Leopardboard

Hi,

I'm trying to compile a custom gpio driver for the Leopardboard 355. I actually got the driver from this website:

http://e2e.ti.com/support/embedded/f/354/t/7633.aspx

I'm trying to compile the driver and am getting errors with the PHYS_OFFSET not being defined. Here is the error message:

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make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- -C /home/billy/DM355SDK840402/kernel/linux-2.6.29 M=/home/billy/DM355SDK840402/kernel/linux-2.6.29/drivers/DavinciGPIOExample modules

make[1]: Entering directory `/home/billy/DM355SDK840402/kernel/linux-2.6.29'

CC [M] /home/billy/DM355SDK840402/kernel/linux-2.6.29/drivers/DavinciGPIOExample/user_gpio.o

In file included from /home/billy/DM355SDK840402/kernel/linux-2.6.29/arch/arm/include/asm/page.h:189,

from include/linux/mmzone.h:20,

from include/linux/gfp.h:4,

from include/linux/kmod.h:22,

from include/linux/module.h:13,

from /home/billy/DM355SDK840402/kernel/linux-2.6.29/drivers/DavinciGPIOExample/user_gpio.c:11:

/home/billy/DM355SDK840402/kernel/linux-2.6.29/arch/arm/include/asm/memory.h: In function ‘virt_to_phys’:

/home/billy/DM355SDK840402/kernel/linux-2.6.29/arch/arm/include/asm/memory.h:160: error: ‘PHYS_OFFSET’ undeclared (first use in this function)

/home/billy/DM355SDK840402/kernel/linux-2.6.29/arch/arm/include/asm/memory.h:160: error: (Each undeclared identifier is reported only once

/home/billy/DM355SDK840402/kernel/linux-2.6.29/arch/arm/include/asm/memory.h:160: error: for each function it appears in.)

/home/billy/DM355SDK840402/kernel/linux-2.6.29/arch/arm/include/asm/memory.h: In function ‘phys_to_virt’:

/home/billy/DM355SDK840402/kernel/linux-2.6.29/arch/arm/include/asm/memory.h:165: error: ‘PHYS_OFFSET’ undeclared (first use in this function)

/home/billy/DM355SDK840402/kernel/linux-2.6.29/arch/arm/include/asm/memory.h: In function ‘virt_to_bus’:

/home/billy/DM355SDK840402/kernel/linux-2.6.29/arch/arm/include/asm/memory.h:188: error: ‘PHYS_OFFSET’ undeclared (first use in this function)

/home/billy/DM355SDK840402/kernel/linux-2.6.29/arch/arm/include/asm/memory.h: In function ‘bus_to_virt’:

/home/billy/DM355SDK840402/kernel/linux-2.6.29/arch/arm/include/asm/memory.h:193: error: ‘PHYS_OFFSET’ undeclared (first use in this function)

make[2]: *** [/home/billy/DM355SDK840402/kernel/linux-2.6.29/drivers/DavinciGPIOExample/user_gpio.o] Error 1

make[1]: *** [_module_/home/billy/DM355SDK840402/kernel/linux-2.6.29/drivers/DavinciGPIOExample] Error 2

make[1]: Leaving directory `/home/billy/DM355SDK840402/kernel/linux-2.6.29'

make: *** [driver] Error 2

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Here is my Makefile:

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obj-m := user_gpio.o

KDIR ?= $(DEVDIR)/kernel/linux-2.6.29

driver:

$(MAKE) ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- -C $(KDIR) M=$(PWD) modules

clean:

rm -rf *.ko *.o *.mod.c .tmp_versions *.symvers usbtest reg led

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I'm not totally sure why the PHYS_OFFSET is not defined. In the memory.h file, I did find a #ifdef CONFIG_MMU block of code that would #define the PHYS_OFFSET along with other stuff, but apparently CONFIG_MMU must be define somewhere since PHYS_OFFSET isn't getting defined.

Any help would be greatly appreciated.

Thanks,

Billy