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Message-ID: <16215.4277.540644.262286@gargle.gargle.HOWL>
Date: Thu, 4 Sep 2003 12:15:17 +0200
From: Mikael Pettersson <mikpe@csd.uu.se>
To: Stephan von Krawczynski <skraw@ithnet.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Compiling an i386 kernel on AMD Opteron
In-Reply-To: <20030904115209.56e019b1.skraw@ithnet.com>
References: <20030904115209.56e019b1.skraw@ithnet.com>
Sender: linux-kernel-owner@vger.kernel.org
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Stephan von Krawczynski writes:
 > Hello,
 > 
 > is it possible to compile a kernel on Opteron for i386 (32-bit) and not 64 bit
 > Opteron with usual make procedures?
 > 
 > When I do a simple "make menuconfig" I can only see the Opteron processor type
 > in "Processor type and features" ...

You need to learn about cross-compilation.

make ARCH=i386

is the first step for you. Most people doing this also have cross-compilation
tool sets (compilers, linkers, libcs etc), and the CROSS_COMPILE= make
variable can be set to pick those up.

E.g., I do
make ARCH=x86_64 CROSS_COMPILE=x86_64-unknown-linux- 
or
make ARCH=ppc CROSS_COMPILE=ppc-unknown-linux-
when building x86-64 or ppc32 kernels on an i386 host.

Your x86-64 gcc should be able to generate 32-bit binaries using
the -m32 flag, so something like make ARCH=i386 CFLAGS=-m32 might work.
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