linux-kernel - Re: Kconfig: ARCH=x86

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Message-ID: <20071116124320.GB12086@devil>
Date:	Fri, 16 Nov 2007 13:43:20 +0100
From:	Andreas Herrmann <aherrman@...or.de>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Kconfig: ARCH=x86

On Fri, Nov 16, 2007 at 12:14:46PM +0100, Andreas Herrmann wrote:
> BTW, is the x86 kernel build documented somewhere?
> At a first glance I didn't find anything suitable under Documentation/.
> Maybe some explanation (like the above) should be added there.

When the ARCH=x86 build is documented, some words about
cross-compilation should be added:

  (1) To compile a 32-bit kernel on a 64-bit system you have to
  Disable 64bit support in menuconfig (config, oldconfig etc.).  A
  subsequent kernel compile will build a 32-bit kernel.  No cross
  compiler is needed.

  (2) To compile a 64-bit kernel on a 32-bit system you have to switch
  on 64-bit support in menuconfig (or config, oldconfig, etc.).  For
  the subsequent kernel compile a cross compiler (supporting 64-bit)
  is needed. You have to use a command line like

        # make CROSS_COMPILE=x86_64-pc-linux-gnu-

  to cross compile your kernel.

Regards,

Andreas

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