topic Re: Error compiling very simple Kernel module in i.MX Processors

Error compiling very simple Kernel module

Matteo — Thu, 30 Aug 2012 13:09:09 GMT

Hi,

I'm trying to compile a kernel test module by means of the below line in i.mx28EVK board.

make CROSS_COMPILE=/opt/freescale/usr/local/gcc-4.4.4-glibc-2.11.1-multilib-1.0/arm-fsl-linux-gnueabi/bin/arm-fsl-linux-gnueabi- -C /home/mydir/imx28/ltib/rpm/BUILD/linux-2.6.35.3 ARCH=arm M=/home/mydir/Project/test modules

The code of test module is listed below.......

#include <linux/module.h>

#include <linux/init.h>
/* public domain */
MODULE_LICENSE("GPL and additional rights");

static int test_init(void)
{
return 0;
}
static void test_exit(void)
{
}
module_init(test_init);
module_exit(test_exit);

.....and the result of the cross-compilation is lised below:

CC /home/mydir/Project/test/test.mod.o
/home/mydir/Project/test/test.mod.c:8: error: variable '__this_module' has initializer but incomplete type
/home/mydir/Project/test/test.mod.c:9: error: unknown field 'name' specified in initializer
/home/mydir/Project/test/test.mod.c:9: warning: excess elements in struct initializer
/home/mydir/Project/test/test.mod.c:9: warning: (near initialization for '__this_module')
/home/mydir/Project/test/test.mod.c:10: error: unknown field 'init' specified in initializer
/home/mydir/Project/test/test.mod.c:10: warning: excess elements in struct initializer
/home/mydir/Project/test/test.mod.c:10: warning: (near initialization for '__this_module')
/home/mydir/Project/test/test.mod.c:14: error: unknown field 'arch' specified in initializer
/home/mydir/Project/test/test.mod.c:14: error: 'MODULE_ARCH_INIT' undeclared here (not in a function)
/home/mydir/Project/test/test.mod.c:14: warning: excess elements in struct initializer
/home/mydir/Project/test/test.mod.c:14: warning: (near initialization for '__this_module')
make[1]: *** [/home/mydir/Project//test/test.mod.o] Error 1

Have you any suggestion??

Thank you very much!!

Re: Error compiling very simple Kernel module

YS — Thu, 30 Aug 2012 20:47:22 GMT

I've tested exact same source code on my iMX28 environment and no trouble to build test.ko.

It seems like you failed to include proper header files (linux/module.h).

export KBUILD_VERBOSE=1 then make may help; it will dump full command line options of gcc. Check if correct Kernel path is specified in -I option.

Re: Error compiling very simple Kernel module

Matteo — Fri, 31 Aug 2012 13:03:24 GMT

Hi and thanks for your reply.

I try to delete the header file module.h from directory /ltib/rpm/BUILD/linux/include and cross compile again. The compiler reports below error:

error: linux/modules.h: No such file or directory

I think that I include the proper file from linux kernel. It is possible that I wrong the make instruction or have a wrong Makefile? My Makefile is this:

obj-m := prova.o

When I installed LTIB I followed the freescale user guide and I'm able of build linux kernel and launch it in the i.mx28EVK.

Re: Error compiling very simple Kernel module

YS — Fri, 31 Aug 2012 16:09:54 GMT

This is Makefile I've tested.

obj-m:=$(MODULES)
CROSS_COMPILE=arm-linux-
ARCH=arm

MAKEARCH=$(MAKE) ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE)
all:
$(MAKEARCH) -C $(KERNEL_SRC) SUBDIRS=$(BUILD_DIR) modules

Re: Error compiling very simple Kernel module

Sasamy — Fri, 31 Aug 2012 16:44:31 GMT

obj-m := prova.o

The kernel includes support modules? Check

$ grep "CONFIG_MODULES" /home/mydir/imx28/ltib/rpm/BUILD/linux-2.6.35.3/.config

CONFIG_MODULES=y

Re: Error compiling very simple Kernel module

BrilliantovKiri — Mon, 03 Sep 2012 06:20:16 GMT

Hello, Alexander!

I use next Makefile:

OV2715 := ov2715

obj-m += $(OV2715).o

all:
        $(MAKE) --directory=$(LINUX_DIR) M=$(shell pwd) \
                ARCH=arm CROSS_COMPILE=$(CROSS) modules

clean:
        $(RM) --recursive .tmp_versions *.o Module.symvers *.mod.c .*.cmd \
                modules.order

cleanall: clean
        $(RM) *.ko

.PHONY: clean cleanall

Re: Error compiling very simple Kernel module

Matteo — Tue, 04 Sep 2012 13:23:56 GMT

Hi.

I have solved my problem by following the suggestions of Alexander, whom I thank. I have set CONFIG_MODULES to y and I'm able to compile modules. Now I'm trying to run modules in the imx28EVK board through the insmod commad, but the result is this:

root@freescale /$ insmod test.ko
insmod: can't insert 'test.ko': kernel does not support requested operation

test.ko is present in the rootfs and it's executable. Do you have any suggestion to solve my new problem?

Thanks to all!!

Re: Error compiling very simple Kernel module

BrilliantovKiri — Tue, 04 Sep 2012 13:32:54 GMT

Hello, Matteo! You rebuild and update linux after change config?

Re: Error compiling very simple Kernel module

Matteo — Tue, 04 Sep 2012 13:58:10 GMT

Hello Brilliantov,

yes, I rebuilt and update linux kernel.

Re: Error compiling very simple Kernel module

Matteo — Wed, 05 Sep 2012 12:51:06 GMT

Hi,

the insmod problem is changed. Now when I type the command

insmod test.ko

the result is:

insmod: can't insert 'test.ko': invalid module format

Do you have any suggestion to solve my new problem?

Thanks to all!!

Re: Error compiling very simple Kernel module

ecm_temp — Mon, 10 Sep 2012 16:11:21 GMT

Re: Error compiling very simple Kernel module

yanhongfeiyan — Wed, 24 Jul 2013 08:28:59 GMT

Hello Matteo,

I met the same problem,too!

when I typed "insmod bq27501.ko",

the result is:

insmod: can't insert 'bq27501.ko': kernel does not support requested operation

can you tell he how did you solve this problem ffinally?

thanks!!

Re: Error compiling very simple Kernel module

yanhongfeiyan — Wed, 24 Jul 2013 08:54:13 GMT

Hello Matteo,

I met the same problem,too!

when I typed "insmod bq27501.ko",

the result is:

insmod: can't insert 'bq27501.ko': kernel does not support requested operation

can you tell he how did you solve this problem ffinally?

thanks!!