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Re: 2.6 64bit kernels

To: Guido Guenther <>,
Subject: Re: 2.6 64bit kernels
From: Daniel Jacobowitz <>
Date: Sun, 28 Dec 2003 21:29:57 -0500
In-reply-to: <20031228195433.GH1298@bogon.ms20.nix>
Original-recipient: rfc822;
References: <20031228195433.GH1298@bogon.ms20.nix>
User-agent: Mutt/1.5.1i
On Sun, Dec 28, 2003 at 08:54:34PM +0100, Guido Guenther wrote:
> Hi,
> could anybody explain to me how one builds 2.6 (current CVS) 64bit
> kernel resulting in a 32bit ELF executable with a current (gcc >= 3.3,
> bintuils >= toolchain.
> Major showstopper is that -Wa,-mabi=o64 doesn't work anymore, but
> -Wa,-mabi=32 -Wa,-mgp64 doesn't either since the assembler doesn't
> accept it.
> Thanks for any help,

I have found that the best way is to build a 64-bit ELF executable. 
Then, use:
  mips64_fp_le-objcopy -O elf32-ntradlittlemips vmlinux vmlinux.32bit

or the equivalent command.

You lose some space (lots) on wasted addressing calculations; no one
has found a good solution AFAIK.

Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

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