Hi,
I am trying to compile a simple module. however make produces error.

I installed the kernel source,
tar -xvjf linux-2.6.27.tar.bz2
cd linux-2.6.27
zcat 2.6.27-at91.patch.gz |patch -p1
zcat 2.6.27-at91-exp.3.patch.gz |patch -p1
cp at91sam9g20ek_defconfig .config
make ARCH=arm oldconfig
make ARCH=arm menuconfig
make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-
no error.
Following is the beginning of the "make" messages:
lww@ubuntu:~/work/learn/01$ make
make -C /home/lww/linux2.6.27/linux-2.6.27 M=/home/lww/work/learn/01 modules
make[1]: Entering directory `/home/lww/linux2.6.27/linux-2.6.27'
CC [M] /home/lww/work/learn/01/helloworld.o
In file included from include/linux/prefetch.h:13,
from include/linux/list.h:6,
from include/linux/module.h:9,
from /home/lww/work/learn/01/helloworld.c:1:
include/linux/types.h:12: fatal error: asm/types.h: No such file or directory
compilation terminated.
make[2]: *** [/home/lww/work/learn/01/helloworld.o] Error 1
make[1]: *** [_module_/home/lww/work/learn/01] Error 2
make[1]: Leaving directory `/home/lww/linux2.6.27/linux-2.6.27'
make: *** [modules] Error 2

thanks

[quote="li.wenwei"]Hi,
I am trying to compile a simple module. however make produces error.

I installed the kernel source,
tar -xvjf linux-2.6.27.tar.bz2
cd linux-2.6.27
zcat 2.6.27-at91.patch.gz |patch -p1
zcat 2.6.27-at91-exp.3.patch.gz |patch -p1
cp at91sam9g20ek_defconfig .config
make ARCH=arm oldconfig
make ARCH=arm menuconfig
make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-
no error.
[/quote]

Until here you built the kernel
Seems succesful.

[quote="li.wenwei"]
Following is the beginning of the "make" messages:
lww@ubuntu:~/work/learn/01$ make
make -C /home/lww/linux2.6.27/linux-2.6.27 M=/home/lww/work/learn/01 modules
make[1]: Entering directory `/home/lww/linux2.6.27/linux-2.6.27'
CC [M] /home/lww/work/learn/01/helloworld.o
[/quote]

Here is not clear where you are and what exactly are you doing.
I suggest you to search (google.com) how to build a simple kernel module from outside the kernel itself.

thanks for your reply.
i got it

I think it's not finding the right arch directory. Maybe you have to pass ARCH= to all invocations of make?