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Re: Cross compile kernel w/ buildroot toolchain

To: Kurt Schwemmer <kurts@vitesse.com>
Subject: Re: Cross compile kernel w/ buildroot toolchain
From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 13 Mar 2006 20:33:16 +0000
Cc: linux-mips@linux-mips.org
In-reply-to: <389E6A416914954182ECDFCD844D8269434FBE@MX-COS.vsc.vitesse.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <389E6A416914954182ECDFCD844D8269434FBE@MX-COS.vsc.vitesse.com>
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On Mon, Mar 13, 2006 at 01:17:09PM -0700, Kurt Schwemmer wrote:

> I'm trying to figure out a toolchain to use for my system. I can compile
> the kernel just fine using the MIPS SDE based distribution, but you
> can't cross compile apps with that. I downloaded and built buildroot and
> I'm trying to (cross) compile the kernel with it too (I'd like to just
> use one compiler for everything). I had it use gcc 3.4.5. When I try to
> compile the kernel with:
> 
> make
> CROSS_COMPILE=~/buildroot/build_mipsel/staging_dir/bin/mipsel-linux-
> 
> I eventually get an error while assembling entry.o:
>   AS      arch/mips/kernel/entry.o
> 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
> 
> I guess this is a "hazard barrier" instruction. Why doesn't gcc 3.4.5
> know about it? What do I need to do to get this to work?

I'm looking at the latest kernel sources and can't see how this could be
happening.  Which version of the kernel are you trying to build?

  Ralf

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