needed to compile my first kernel program

jf.argentino · 01-15-2010, 04:14 AM

Code:

grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,0)
# kernel /boot/vmlinuz-version ro root=/dev/sda1
# initrd /boot/initrd-version.img
#boot=/dev/sda
default=1
timeout=0

splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu

title Fedora (2.6.32.3)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32.3 ro root=UUID=21d34cba-e758-4a3d-8f2f-e98988868a68 rhgb quiet
initrd /boot/initrd-2.6.32.3.img

title Fedora (2.6.27.5-117.fc10.i686)
root (hd0,0)
kernel /boot/vmlinuz-2.6.27.5-117.fc10.i686 ro root=UUID=21d34cba-e758-4a3d-8f2f-e98988868a68 rhgb quiet
initrd /boot/initrd-2.6.27.5-117.fc10.i686.img

"default" is set to 1 (grub start counting to 0), and it's the standard fedora kernel. More over, you have a time out of 0, that means that the menu to choose the kernel is not displayed, add 5 or 10 to display it 5 (or 10) seconds before booting with the default kernel.

rachilmeth · 01-15-2010, 04:20 AM

@ anishakaul
compiled the code it is generating .ko file but when i do
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
insmod kernel
insmod: can't read 'kernel': No such file or directory
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

new kernel is latest one 2.6.32.3
old kernel is my fedor10 2.6.27.5

++++++++++++++++++++++++++++++++++++
grub.conf
++++++++++++++++++++++++++++++++++++
title Fedora (2.6.32.3)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32.3 ro root=UUID=21d34cba-e758-4a3d-8f2f-e98988868a68 rhgb quiet
initrd /boot/initrd-2.6.32.3.img
title Fedora (2.6.27.5-117.fc10.i686)
root (hd0,0)
kernel /boot/vmlinuz-2.6.27.5-117.fc10.i686 ro root=UUID=21d34cba-e758-4a3d-8f2f-e98988868a68 rhgb quiet
initrd /boot/initrd-2.6.27.5-117.fc10.i686.img
~

Anisha Kaul · 01-15-2010, 04:21 AM

Quote:

Originally Posted by rachilmeth

@ anishakaul
compiled the code it is generating .ko file but when i do
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
insmod kernel
insmod: can't read 'kernel': No such file or directory
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

try from root:

Code:

insmod kernel.ko

rachilmeth · 01-15-2010, 04:25 AM

insmod kernel.ko
insmod: error inserting 'kernel.ko': -1 Invalid module format

Anisha Kaul · 01-15-2010, 04:28 AM

Quote:

Originally Posted by rachilmeth

insmod kernel.ko
insmod: error inserting 'kernel.ko': -1 Invalid module format

That's quite surprising . I tried it on my terminal now, it worked fine !!

Kindly post the output of 'make' command !

rachilmeth · 01-15-2010, 04:33 AM

Makefile output :make
make -C /lib/modules/2.6.32.3/build M=/root/abc modules
make[1]: Entering directory `/root/linux-2.6.32.3'
CC [M] /root/abc/kernel.o
Building modules, stage 2.
MODPOST 1 modules
CC /root/abc/kernel.mod.o
LD [M] /root/abc/kernel.ko
make[1]: Leaving directory `/root/linux-2.6.32.3'

File generated are

-rw-r--r-- 1 root root 236 kernel.c
-rw-r--r-- 1 root root 140 Makefile
-rw-r--r-- 1 root root 0 Module.symvers
-rw-r--r-- 1 root root 31 modules.order
-rw-rw-r-- 1 root root 35064 kernel.o
-rw-rw-r-- 1 root root 35088 kernel.mod.o
-rw-r--r-- 1 root root 497 kernel.mod.c
-rw-r--r-- 1 root root 69195 kernel.ko

Anisha Kaul · 01-15-2010, 04:37 AM

Remove ONLY the following files from your folder and then do make and insmod again:

Code:

rm Module.symvers modules.order kernel.o kernel.mod.o kernel.mod.c kernel.ko

rachilmeth · 01-15-2010, 04:41 AM

@Anisha
still same
insmod kernel.ko
insmod: error inserting 'kernel.ko': -1 Invalid module format

Anisha Kaul · 01-15-2010, 04:46 AM

It never happened like this with me !!

Now my last question, have u properly inserted tabs in u r makefile ?

I am asking this because this program is working very fine on my computer !!

rachilmeth · 01-15-2010, 04:48 AM

yeah ...otherwise make won't work properly ..can u show me your output of make & files created , thanks ...

Anisha Kaul · 01-15-2010, 04:55 AM

Code:

linux:/home/anisha/t # make
make -C /lib/modules/2.6.31.8-0.1-desktop/build M=/home/anisha/t modules
make[1]: Entering directory `/usr/src/linux-2.6.31.8-0.1-obj/x86_64/desktop'
make -C ../../../linux-2.6.31.8-0.1 O=/usr/src/linux-2.6.31.8-0.1-obj/x86_64/desktop/. modules
  CC [M]  /home/anisha/t/ker.o
  Building modules, stage 2.
  MODPOST 1 modules
  LD [M]  /home/anisha/t/ker.ko
make[1]: Leaving directory `/usr/src/linux-2.6.31.8-0.1-obj/x86_64/desktop'

Code:

linux:/home/anisha/t # ls -l
total 240
-rw-r--r-- 1 root root   237 2010-01-15 16:21 ker.c
-rw-r--r-- 1 root root   236 2010-01-15 16:20 ker.c~
-rw-r--r-- 1 root root 82299 2010-01-15 16:21 ker.ko
-rw-r--r-- 1 root root   132 2010-01-15 16:21 .ker.ko.cmd
-rw-r--r-- 1 root root   700 2010-01-15 16:21 ker.mod.c
-rw-r--r-- 1 root root 46864 2010-01-15 16:21 ker.mod.o
-rw-r--r-- 1 root root 19362 2010-01-15 16:21 .ker.mod.o.cmd
-rw-r--r-- 1 root root 36992 2010-01-15 16:21 ker.o
-rw-r--r-- 1 root root 19239 2010-01-15 16:21 .ker.o.cmd
-rw-r--r-- 1 root root   153 2010-01-15 16:20 Makefile
-rw-r--r-- 1 root root     0 2010-01-15 16:21 Module.markers
-rw-r--r-- 1 root root    29 2010-01-15 16:21 modules.order
-rw-r--r-- 1 root root     0 2010-01-15 16:21 Module.symvers
drwxr-xr-x 2 root root  4096 2010-01-15 16:21 .tmp_versions

Code:

linux:/home/anisha/t # insmod ker.ko
linux:/home/anisha/t #

rachilmeth · 01-15-2010, 05:02 AM

@anisha
hiw many kernels you have installed in your system.

Anisha Kaul · 01-15-2010, 05:06 AM

I didn't install any special kernel on my comp.

I am working with the default kernel on OpenSuse 11.2

I suppose u should fix your kernel problem (uname -r) first and then try anything else, coz. now kernel problem is the only difference between your comp and my comp w.r.t insmod !

rachilmeth · 01-15-2010, 05:06 AM

yes very true ...thanks

Anisha Kaul · 01-15-2010, 05:11 AM

1. Try whatever jf.argentino has said.
2. Also read the links I pointed to.

If still u r unable to solve the version problem then u can start a new thread for it !

Good Luck