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Old 05-31-2007, 01:18 PM   #1
Registered: Sep 2005
Distribution: debian, solaris 10
Posts: 200

Rep: Reputation: 31
compile kernel modules without compiling new kernel

I would need to add a couple of modules to the kernel.
if i compile a new kernel, i am going to lose the modules that doesn't come with the kernel such as ieee80211 and ipw3945 and it's a pain to reinstall those in this laptop. also dri and direct rendering will stop funcioning.
how can just enable modules in the kernel without having to install a whole new kernel. I need at this stage cpu scaling and fuse
I heard I could do a "make module_install"? but when?
here's how i compile my kernel

make mrproper
make oldconfig
make menuconfig
fakeroot make-kpkg --append-to version -xxx --revision x kernel-image kernel-headers
sudo dpkg -i linux-image. deb

this procedure tells me a big warning saying to mode /lib/modules/2.6.x.x/kernel somewhere else.
if do so, the modules for the wireless and others will stop working.

if there's a trick to do what i have to do I'll be grateful if you let me know. or any book i could buy and see.
thank you very much.
Old 06-01-2007, 06:33 AM   #2
Registered: Jul 2006
Location: Shanghai
Distribution: Fedora, OpenSUSE
Posts: 31

Rep: Reputation: 16
Smile Look it up at <<Linux Device Driver>> 3rd

Actually, you don't need compile the kernel. Just compile the module directly.

However, you need to prepare/write a simple makefile and then type one line command to make it.

1. Kernel code should prepare for the build.
# make oldconfig
# make

Trick : No need to wait it complete, wait 30 seconds, Ctrl-C to stop it.

2. Put the module source code and makefile together. For example, module file is example.c.

Suppose kernel is at /usr/src/linux-

# make -C /usr/src/linux- M=`pwd` modules
make[1]: Leaving directory `/usr/src/linux-'
# ls
.example.ko.cmd .tmp_versions Module.symvers example.mod.c
.example.mod.o.cmd Makefile example.c example.mod.o
.example.o.cmd Makefile~ example.ko example.o


obj-m := example.o

Details also could see LDD3 - Linux Device Driver 3rd edition.


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