[Buildroot] how can i implement my kernel module and debug it

[Esaïe Ledoux NJONGSSI KOUAM]

so i have develop my kernel module and it is working very well.

there is my folder :

hello.c :

#include <linux/module.h>    // included for all kernel modules
#include <linux/kernel.h>    // included for KERN_INFO
#include <linux/init.h>      // included for __init and __exit macros

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Lakshmanan");
MODULE_DESCRIPTION("A Simple Hello World module");

static int __init hello_init(void)
{
    printk(KERN_INFO "Hello world!\n");
    return 0;    // Non-zero return means that the module couldn't be
loaded.
}

static void __exit hello_cleanup(void)
{
    printk(KERN_INFO "Cleaning up module.\n");
}

module_init(hello_init);
module_exit(hello_cleanup);

> Makefile :

obj-m += helloKernelModule.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

when i run make , it generate some files like hello.o , hello.ko , ...

> integrate the package into Buildroot (see comments below)

But , i'm not understanding very well when you said i integrate the package
on buildroot. Is it only the Makefile and the hello.c code or Makefile ,
hello.c code ,  hello.o , hello.ko , ... ?

> check if the package builds correctly within Buildroot and gets
deployed to target/lib/modules

Okay , i have put the project on one folder kernel_module_test in buildroot
tree

external.desc :

name: BR2_PACKAGE_KERNEL_MODULE_TEST

external.mk :

include $(sort $(wildcard $(BR2_EXTERNAL_KERNEL_MODULE_TEST_PATH)/*/*.mk))

Config.in :

config BR2_PACKAGE_KERNEL_MODULE_TEST
        bool "kernel_module_test"
        depends on BR2_LINUX_KERNEL
        help
                Linux Kernel Module Cheat.

kernel_module_test.mk :

KERNEL_MODULE_VERSION = 1.0
KERNEL_MODULE_SITE =
$(BR2_EXTERNAL_KERNEL_MODULE_TEST_PATH)/kernel_module_test
KERNEL_MODULE_SITE_METHOD = local
$(eval $(kernel_module_test))
$(eval $(generic-package))

As you can see , i want to use a BR2_EXTERNAL directory structure.

So i have make it by typing :

/buildroot# make BR2_EXTERNAL=kernel_module_test menuconfig

Go ahead into External Options , and fortunatly , i have see my package
inside, .. so i have saved it and exit.

After that i have type make.

 i have seen my package on output/build , looks like kernel_module_test
folder that contains some files.

Finaly , i have seen some files on
output/target/lib/modules/${BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE} but not
my module.

So i think that it means that my modules/package was not loaded and i can't
exploit it.

please where i have mistaken ??
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