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Re: loadable kernel module link failure - endianness incompatible with

To: "David Daney" <ddaney@caviumnetworks.com>
Subject: Re: loadable kernel module link failure - endianness incompatible with that of the selected emulation
From: myuboot@fastmail.fm
Date: Wed, 20 Jan 2010 10:10:12 -0600
Cc: linux-kernel@vger.kernel.org, linux-mips@linux-mips.org
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On Tue, 19 Jan 2010 15:47 -0800, "David Daney"
<ddaney@caviumnetworks.com> wrote:
> myuboot@fastmail.fm wrote:
> > I got a link error when compiling 2 loadable kernel modules -
> > "endianness incompatible with that of the selected emulation". 
> > 
> > But both kernel and the kernel modules of error are in big endian. I
> > don't know what I should check or fix. Any suggestions? I checked the
> > endianess of the kernel by checking the elf header of vmlinux file, is
> > that the right way to do it?
> > 
> > Below are the error info and the readelf output, showing both the kernel
> > and a kernel module are in big endian.
> > Thanks for your help. Andrew
> > 
> > 1) error log 
> > make -C /home/root123/sources/kernel/linux
> > CROSS_COMPILE=""/home/root123/sources/gcc3.4.3-be"/bin/mips-linux-"
> > M=/home/root123/sources/sdk/platform/src/linux/mxp/src modules    
> > 
> >   LD [M]  /home/root123/sources/sdk/platform/src/linux/mxp/src/mxpmod.o
> > /home/root123/sources/gcc3.4.3-be/bin/mips-linux-ld:
> > /home/root123/sources/sdk/platform/src/linux/mxp/src/mmxpcore.o:
> > compiled for a big endian system and target is little endian
> > /home/root123/sources/gcc3.4.3-be/bin/mips-linux-ld:
> > /home/root123/sources/sdk/platform/src/linux/mxp/src/mmxpcore.o:
> > endianness incompatible with that of the selected emulation
> > /home/root123/sources/gcc3.4.3-be/bin/mips-linux-ld: failed to merge
> > target specific data of file
> > /home/root123/sources/sdk/platform/src/linux/mxp/src/mmxpcore.o
> > make[13]: ***
> > [/home/root123/sources/sdk/platform/src/linux/mxp/src/mxpmod.o] Error 1
> > 
> 
> Looks like a toolchain bug/configuration-problem.  Hard to tell though 
> as you didn't pass 'V=1' on the make invocation line.
> 
> David Daney
With the V=1 option suggested, I found the culprit is this "-m
elf32ltsmip". It is working now.

Thanks. Andrew

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