RE: Problem with binutils with Cortex-m3 and cortex-a9 cpu

["Ramana Radhakrishnan" <ramana dot radhakrishnan at arm dot com>]

> -----Original Message-----
> From: Nitin Garg [mailto:nitingarg98@gmail.com]
> Sent: 01 May 2009 14:21
> To: Ramana Radhakrishnan
> Cc: binutils@sourceware.org
> Subject: Re: Problem with binutils with Cortex-m3 and cortex-a9 cpu
> 
> About Cortex-m3 build log, I will send you in some time today.
> 
> Is there a solution for Cortex-A9 Loadable kernel module problem? Do I
> need to change the way LKMs are built?

You could downgrade your architecture options to something that doesn't
generate 
Movw's or movt or support these relocations in your modutils which will work
around the problem for you  (-march=armv6). That's the only work around I
can suggest at the moment. 

Please take up the issue of supporting the relocs with the kernel folk or
whoever maintains the code for modutils .


HTH.
Ramana


> 
> Regards,
> 
> On Fri, May 1, 2009 at 8:13 AM, Ramana Radhakrishnan
> <ramana.radhakrishnan@arm.com> wrote:
> >
> >
> >> -----Original Message-----
> >> From: binutils-owner@sourceware.org [mailto:binutils-
> >> owner@sourceware.org] On Behalf Of Nitin Garg
> >> Sent: 01 May 2009 14:09
> >> To: binutils@sourceware.org
> >> Subject: Re: Problem with binutils with Cortex-m3 and cortex-a9 cpu
> >>
> >> ?I am working on Cortex-A9 and M3 of ARM. I am using gcc 4.4.0,
> uClibc
> >> 0.9.30.1 and binutils 2.19.1 and building it for Cortex-m3. While
> >> building for m3 if I specify arch as armv7-m alonmg with cpu
> >> cortex-m3, the build fails.
> >
> > Can you be more specific and mention what your parameters are and
> what the
> > error message is ?
> >
> >>
> >> ?Using the same set, if I build the toolchain for Cortex-A9
> >> (cpu=cortex-a9 and arch=armv7-a), the Linux kernel (2.6.28.9) and
> >> rootfs built with this toolchain works fine. But if I build a
> loadable
> >> kernel module, when I insmod the module it fails and gives an error
> as
> >> "undefined relocation: 43" from the Linux kernel.
> >
> > Probably that's because modutils needs to handle relocation 43 which
> looking
> > at the include file
> > is R_ARM_MOVW_ABS_NC.
> >
> >
> > cheers
> > Ramana
> >
> >
> >