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Date:	Mon, 13 Mar 2006 13:16:31 -0800
From:	David Daney <ddaney@avtrex.com>
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To:	Kurt Schwemmer <kurts@vitesse.com>
CC:	Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org
Subject: Re: Cross compile kernel w/ buildroot toolchain
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Kurt Schwemmer wrote:
> I didn't touch any of the source yet. 
> 
> I'm downloading the 1/10/05 2.6.15 tarball (
> ftp://ftp.linux-mips.org/pub/linux/mips/kernel/v2.6/linux-2.6.15.tar.gz
> )now to see if that fixes things.
> 
> In response to Thiemo's message the error with (V=1) is:
> 
> make -f scripts/Makefile.build obj=arch/mips/kernel
>   /klocal/buildroot/build_mipsel/staging_dir/bin/mipsel-linux-gcc
> -Wp,-MD,arch/mips/kernel/.entry.o.d  -nostdinc -isystem
> /klocal/buildroot/build_mipsel/staging_dir/bin-ccache/../lib/gcc/mipsel-
> linux-uclibc/3.4.5/include -D__KERNEL__ -Iinclude  -D__ASSEMBLY__  -I
> /usr/local/src/linux-2.6/include/asm/gcc -G 0 -mno-abicalls -fno-pic
> -pipe  -finline-limit=100000 -mabi=32 -march=mips32r2 -Wa,-32
> -Wa,-march=mips32r2 -Wa,-mips32r2 -Wa,--trap
> -Iinclude/asm-mips/mach-mips -Iinclude/asm-mips/mach-generic -Wall
> -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common
> -ffreestanding -O2     -fomit-frame-pointer  -I
> /usr/local/src/linux-2.6/include/asm/gcc -G 0 -mno-abicalls -fno-pic
> -pipe  -finline-limit=100000 -mabi=32 -march=mips32r2 -Wa,-32
> -Wa,-march=mips32r2 -Wa,-mips32r2 -Wa,--trap
> -Iinclude/asm-mips/mach-mips -Iinclude/asm-mips/mach-generic    -c -o
> arch/mips/kernel/entry.o arch/mips/kernel/entry.S
> arch/mips/kernel/entry.S: Assembler messages:
> arch/mips/kernel/entry.S:157: Error: opcode not supported on this
> processor: mips32 (mips32) `jr.hb $31'
> make[1]: *** [arch/mips/kernel/entry.o] Error 1
> make: *** [arch/mips/kernel] Error 2
> 
> Also, assembler -v output:
> GNU assembler version 2.16.1 (mipsel-linux-uclibc) using BFD version
> 2.16.1
> 
> Thanks,
> Kurt Schwemmer
> 

You could try using crosstool to generate the compiler instead of buildroot.

Also try passing -v to gcc, that will cause it to show the exact options 
that it is passing to gas.  Perhaps that would shed some light on things.

David Daney