From: Philippe De Muyter <phdm@macqel.be>
To: uClinux development list <uclinux-dev@uclinux.org>
Cc: linux-m68k@vger.kernel.org, Greg Ungerer <gerg@uclinux.org>
Subject: Re: [PATCH v2 1/6] m68k: merge mmu and non-mmu versions of muldi3
Date: Wed, 20 Apr 2011 11:12:16 +0200 [thread overview]
Message-ID: <20110420091216.GB3296@frolo.macqel> (raw)
In-Reply-To: <BANLkTi=9ZNg+eh6S1NeyJaCs4e0tRjJELQ@mail.gmail.com>
On Wed, Apr 20, 2011 at 10:55:15AM +0200, Geert Uytterhoeven wrote:
> On Wed, Apr 20, 2011 at 10:06, Sam Ravnborg <sam@ravnborg.org> wrote:
> > Hi Greg.
> >
> >> +
> >> +#if defined(__mc68020__) || defined(__mc68030__) || \
> >> + defined(__mc68040__) || defined(__mc68060__)
> >
> > Why use these to decide if this is MMU or not?
> > This code is not exposed to user-space so we can rely on CONFIG_* symbols.
> > IMO the CONIFG_* symbols is easier to read/maintain.
>
> Because technically it doesn't depend on having a MMU or not, but on having
> the full 32-bit multiplication instruction or not.
>
> Does Coldfire-with-MMU (for which we haven't integrated the support
> yet) have that
> instruction?
Actually, MCF547x & MCF548x (CFv4e family) are integrated but without their
limited MMU functionality.
freescale had even written an mmu port for 2.6.25 but has not pushed it
upstream. This port can be found on their site or in the openwrt repository.
MCF547x & MCF548x do not have that instruction.
Philippe
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next prev parent reply other threads:[~2011-04-20 9:12 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-20 5:54 [PATCH v2 0/6] m68knommu: merge and clean up of arch/m68k/lib files gerg
2011-04-20 5:54 ` gerg
2011-04-20 5:54 ` [PATCH v2 1/6] m68k: merge mmu and non-mmu versions of muldi3 gerg
2011-04-20 5:54 ` [PATCH v2 2/6] m68k: merge mmu and non-mmu versions of lib/Makefile gerg
2011-04-20 5:54 ` [PATCH v2 3/6] m68k: remove duplicate memmove() implementation gerg
2011-04-20 5:54 ` [PATCH v2 4/6] m68k: remove duplicate memset() implementation gerg
2011-04-20 5:54 ` [PATCH v2 5/6] m68k: remove duplicate memcpy() implementation gerg
2011-04-20 5:54 ` [PATCH v2 6/6] m68k: let Makefile sort out compiling mmu and non-mmu lib/checksum.c gerg
2011-04-20 8:06 ` [PATCH v2 1/6] m68k: merge mmu and non-mmu versions of muldi3 Sam Ravnborg
2011-04-20 8:55 ` [uClinux-dev] " Geert Uytterhoeven
2011-04-20 9:12 ` Philippe De Muyter [this message]
2011-04-20 9:31 ` Greg Ungerer
2011-04-20 9:55 ` Philippe De Muyter
2011-04-20 10:18 ` Greg Ungerer
2011-04-20 10:38 ` Andreas Schwab
2011-04-20 10:38 ` Philippe De Muyter
2011-04-20 11:01 ` Greg Ungerer
2011-04-20 11:23 ` Philippe De Muyter
2011-04-20 8:57 ` Philippe De Muyter
2011-04-20 9:08 ` Greg Ungerer
2011-04-20 6:04 ` [PATCH v2 0/6] m68knommu: merge and clean up of arch/m68k/lib files Greg Ungerer
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