Re: [android-kernel] Re: kernel modules "hello world " in samsung n8000

[Bridgette]

may be the vermagic...if you do a 'modinfo kernelModule.ko' it will list what the vermagic is and it should match your kernel version on your phone, adb shell cat /proc/version

If the vermagic does not match, try setting the EXTRAVERSION in the /path/to/kernel/Makefile to match the kernel version and rebuild.

This is an example of what to look for and set in the Makefile:
VERSION=3
PATCHLEVEL=0
SUBLEVEL=15
EXTRAVERSION=-962322


- bridgette

---

From: "arun...@iiitd.ac.in" <arun...@iiitd.ac.in>
To: android...@googlegroups.com
Sent: Thursday, April 18, 2013 4:38 AM
Subject: [android-kernel] Re: kernel modules "hello world " in samsung n8000

Hi,

I am also facing exactly similar problem while Kernel Module Development with HTC Explorer Device.

Can you please tell as to whether you have found a solution to this problem.

Any help will be deeply appreciated.

Thanks and Regards,
Arun Kumar Jindal

On Tuesday, April 9, 2013 8:50:51 AM UTC+5:30, Fazhang Liu wrote:

my device is samsung n8000   

android version : 4.0.4

kernel version : 3.0.15-962322

i want to make a "hello world " kernel module .   

git clone https://android.googlesource. com/kernel/samsung.git   to get source code . and make it .

hello world code

#include <linux/module.h>	/* Needed by all modules */
#include <linux/kernel.h>	/* Needed for KERN_INFO */

int init_module(void)
{
	printk(KERN_INFO "Hello world 1.\n");

	/* 
	 * A non 0 return means init_module failed; module can't be loaded. 
	 */
	return 0;
}

void cleanup_module(void)
{
	printk(KERN_INFO "Goodbye world 1.\n");
}

make

obj-m += hello-1.o

all:
	make -C /opt/kernel/samsung M=$(PWD) modules

clean:
	make -C /opt/kernel/samsung M=$(PWD) clean

ARCH=arm CROSS_COMPILE=/opt/prebuilt/ linux-x86/toolchain/arm-eabi- 4.4.3/bin/arm-eabi- make

and make success   .  

but when i push ko to device 

su 

insmod  hello.ko 

insmod: init_module 'hello.ko ' failed (Exec format error)

what's wrong with that ? 

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[Si Dao]

Pls execute bellow command in your target device(same env. as where you execute 'insmod'):
$ readelf -h hello.ko
$ uname -a

and paste logfile here.

On Sunday, April 21, 2013 2:39:41 AM UTC+7, Shuang Liang wrote:

Have you enabled the LKM in kernel configs?

On Monday, April 8, 2013 11:20:51 PM UTC-4, Fazhang Liu wrote:

my device is samsung n8000   

android version : 4.0.4

kernel version : 3.0.15-962322

i want to make a "hello world " kernel module .   

git clone https://android.googlesource.com/kernel/samsung.git   to get source code . and make it .

hello world code

#include <linux/module.h>	/* Needed by all modules */
#include <linux/kernel.h>	/* Needed for KERN_INFO */

int init_module(void)
{
	printk(KERN_INFO "Hello world 1.\n");

	/* 
	 * A non 0 return means init_module failed; module can't be loaded. 
	 */
	return 0;
}

void cleanup_module(void)
{
	printk(KERN_INFO "Goodbye world 1.\n");
}

make

obj-m += hello-1.o

all:
	make -C /opt/kernel/samsung M=$(PWD) modules

clean:
	make -C /opt/kernel/samsung M=$(PWD) clean

ARCH=arm CROSS_COMPILE=/opt/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/arm-eabi- make

[Boyan Vladinov]

Maybe it is the same issue: http://stackoverflow.com/questions/16562102/insmod-init-module-failed-exec-format-error

[Boyan Vladinov]

Also use this example: http://www.faqs.org/docs/kernel/hello2.html with the proper module macroses