Hi Dan,
I have tried -mlong-calls option to the compiler, but is still gives
"unable to resolve printk" when I insmod the LKM.
When I 'cat' the /proc/ksyms, it shows printk_Rcxyz.... When I disable the
MODVERSIONING by using 'make menuconfig' during kernel configuration
process, and build the kernel again for MIPS platform, the proc/ksyms still
shows the printk_Rcxyz ... i.e, function name with a suffix.
Can you elaborate as to what are the steps needed to build the kernel with
MODVERSIONING disabled, etc.....
Regards,
Adeel
-----Original Message-----
From: Dan Aizenstros [mailto:daizenstros@quicklogic.com]
Sent: Thursday, August 28, 2003 8:43 PM
To: AdeelM@avaznet.com
Subject: Re: RE: Information required
Hello Adeel,
You need to pass -mlong-calls to the compiler.
You can add it the CFLAGS.
Regards,
Dan Aizenstros
Software Engineering Manager
QuickLogic Canada
>>> Adeel Malik <AdeelM@avaznet.com> 08/28/03 08:22 AM >>>
Hello Jun,
Thanks for the reply.I have checked for the unresolved function symbols like
"printk" and "register_chrdev", and found that they are present in
/proc/ksyms. So it appears to me that I may be compiling the module with
incorrect parameters.
Below is the Makefile for the Loadable Module:
/***************************************************************************
**************************************/
CROSS_COMPILE=
/backup/buildroot-QuickMIPS/build/staging_dir/bin/mipsel-uclibc-
TARGET = example_driver
INCLUDE = /backup/buildroot-QuickMIPS/build/linux-2.4.20/include
CC = $(CROSS_COMPILE)gcc -I${INCLUDE}
CFLAGS = -DMODVERSIONS -I${INCLUDE}/linux/modversions.h
${TARGET}.o: ${TARGET}.c
.PHONY: clean
clean:
rm -rf ${TARGET}.o
/***************************************************************************
*************************************/
Do you think that I need to modify the makefile or add some more options to
CFLAGS.
I have ensured that the kernel is compiled with "module-option" turned on.
Also my module uses symbol versioning (sometimes called module versioning).
I use the following lines of code at the start of header file to accomplish
this:
/***************************************************************************
**********************************/
#if defined (CONFIG_MODVERSIONS) && ! defined (MODVERSIONS)
#include <linux/modversions.h>
#define MODVERSIONS
#endif
/***************************************************************************
*********************************/
I have successfully cross-compiled user-space applications on the target
platform. Only when i do the kernel work, this unresolved symbol (like
printk, register_chrdev, etc..) phenomenon happens.
ADEEL MALIK,
-----Original Message-----
From: linux-mips-bounce@linux-mips.org
[mailto:linux-mips-bounce@linux-mips.org]On Behalf Of Jun Sun
Sent: Wednesday, August 27, 2003 9:51 PM
To: Adeel Malik
Cc: linux-mips@linux-mips.org; jsun@mvista.com
Subject: Re: Information required
On Wed, Aug 27, 2003 at 07:30:26PM +0500, Adeel Malik wrote:
> Hi All,
> I am involved in Embedded Linux Development for MIPS Processor. I
> need to write a device driver for a MIPS Target Platform. When I insmod
the
> driver.o file, the linux bash script running on the target hardware gives
me
> the error message like ;
> 1. unable to resolve the printk function
> 2. unable to resolve the register_chardev function
> etc.
> Can you plz give me the direction as to how to proceed to tackle this
> situation.
Make sure your kernel compiled with module option turned on.
Does it use module version (CONFIG_MODVERSIONS)?
If so, add -DMODVERSIONS -include $(KERNEL_PATH)/include/linux/modversions.h
to your CFLAGS.
Jun
