AT91RM9200 and linux device drivers

jeanlee · **Joined:** Wed Dec 01, 2004 4:34 pm **Posts:** 5

Hello all,

I would like to know where I can get a list of device drivers available with Linux (I think 2.4.27) for the AT91RM9200 ?

Is there any character LCD controller device driver available ?

Thank you for any help.

Jean Lee

pfilippi · **Joined:** Fri Feb 13, 2004 7:53 pm **Posts:** 329

Hi JeanLee,

Quote:

I would like to know where I can get a list of device drivers available with Linux (I think 2.4.27) for the AT91RM9200 ?

Check that FAQ http://www.atmel.com/dyn/products/faq_card.asp?faq_id=1626

Quote:

Is there any character LCD controller device driver available ?

I know that the Cogent Board (SBC 337) has another EPSON display driver but I do not know if Linux BSP is available for this board.

Hope this helps.

deseaf · **Joined:** Tue Dec 28, 2004 5:50 pm **Posts:** 11

Hi JeanLee,

here have some patch for reference:
http://maxim.org.za/AT91RM9200/
http://maxim.org.za/AT91RM9200/2.6/

i meet a trouble hope sombody give some idea,
cross-2.95.3.zip CANNOT work for module and application!
this toolchain is from AT91CDROM downloaded from 81.80.104.162(at91 support ftp site)

someone can give sample Makefile to build a device driver for 2.4.27-vrs1,
which not build in kernel,but use insmod at run time and a simple working application Makefile example,help pls.

when insmod a driver this error message appear:
"kernel-module version mismatch"

that is to say,the driver is compiled for a kernel version and the running kernel is another version ,they are mismath!
but the toolchain should have the correct 2.4.27-vrs1 kernel head files!
i set the kernel head files follow this step:
1,cd /usr/local/arm
2,tar jxvf cross-2.95.3.tar.bz2
3,cd ~/linux-2.4.27-vrs1-ATMEL
4,cp -rf include/asm-arm /usr/local/arm/2.95.3/arm-linux/include/asm
5,cp -rf include/linux /usr/local/arm/2.95.3/arm-linux/include

for the reason ,to compile a driver and application must rebuild the crosscompile toolchain again,but it is a trouble task to do,could someone have a working toolchain with 2.4.27-vrs1 ?

edi · **Posted:** Thu Jan 13, 2005 8:14 pm

Hi deseaf,
try to force the loading:

Quote:

insmod -f module.o

If this is not working (or if you want to load the module without an error messages) try the following.
Get the complete kernel version string:
uname -a
Change the value of EXTRAVERSION in the file "Makefile", located at your arm-linux source tree, to the desired value.
Then run (the .config file should be the same as for the kernel which runs on the target):
make clean dep

And now build your module.
A very simple example is shown in the book "Linux Device Drivers" from Alessandro Rubini (O'Reilly). Save the source as "hello.c".

Quote:

#define MODULE
#include <linux/module.h>

int init_module(void) { printk("<1>Hello, world\n"); return 0; }
void cleanup_module(void) { printk("<1>Goodbye cruel world\n"); }

compile and start :
root# gcc -c hello.c
root# insmod ./hello.o
root# rmmod hello

Be sure you are "root" for doing this.

Hope this helps,
Edi

AT91RM9200 and linux device drivers

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