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

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Date:	Fri, 3 Sep 2010 20:41:36 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	David Howells <dhowells@...hat.com>
CC:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	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

On 03/09/10 19:52, David Howells wrote:
> 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).

Ah, ok, that would explain it. The m520x is one of the newer ColdFire
variants (thus proper cpu=5208 support is only in more recent binutils.
A fallback to -m5200 (which is the absolute minimum ColdFire support)
looks like it is not quite enough here.

Regards
Greg
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