linux-kernel - Re: [PATCH 2/3] M68K: Use CONFIG_MMU not __uClinux_

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Date:	Fri, 03 Sep 2010 10:52:57 +0100
From:	David Howells <dhowells@...hat.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	dhowells@...hat.com, Greg Ungerer <gerg@...pgear.com>,
	Andreas Schwab <schwab@...hat.com>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] M68K: Use CONFIG_MMU not __uClinux__ to select m68knommu contributions

Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> > Not sure about m68k but m68knommu targets already setup
> > appropriate -mcpu flags for its various supported CPU types.
> 
> Same for m68k.

It doesn't seem to:

	warthog>grep -r mcpu arch/m68k
	warthog1>grep -r mtune arch/m68k
	warthog1>

I see that m68knommu does:

	warthog1>grep -r mcpu arch/m68knommu/
	arch/m68knommu/Makefile:cflags-$(CONFIG_M5206)          := $(call cc-option,-mcpu=5206,-m5200)
	arch/m68knommu/Makefile:cflags-$(CONFIG_M520x)          := $(call cc-option,-mcpu=5208,-m5200)
	arch/m68knommu/Makefile:cflags-$(CONFIG_M523x)          := $(call cc-option,-mcpu=523x,-m5307)
	...

I guess the m68k compiler I already had doesn't fully support -m5200, since I
see that, but it doesn't compile some of the instructions when compiling the
m68knommu defconfig (CONFIG_M520x=y).

David
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