linux-kernel - How do arch/ppc and arch/powerpc differ?

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Message-Id: <200803021602.EGJ81261.OJtOFVQFFHOSLM@I-love.SAKURA.ne.jp>
Date:	Sun, 2 Mar 2008 16:02:56 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	linux-kernel@...r.kernel.org
Subject: How do arch/ppc and arch/powerpc differ?

Hello.

According to Documentation/SubmitChecklist,
ppc64 is a good architecture for cross-compilation checking.
I've just set up cross compiling environment for ppc64
using "crossdev -t ppc64" on Gentoo 2007.0 environment.

Now I'm trying to modify Makefile to build kernel for ppc64.
I've got a question here.

  ARCH            ?= powerpc
  CROSS_COMPILE   ?= powerpc64-unknown-linux-gnu-

Which keyword ("ppc" or "powerpc") do I need to set for ARCH
to do cross-compilation checking?
How do they differ?

Regards.
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