linux-kernel - Re: [PATCH] net: fec: Fix build for MCF5272

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Message-ID: <20130618040312.GA12181@roeck-us.net>
Date:	Mon, 17 Jun 2013 21:03:12 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Frank.Li@...escale.com, jim_baxter@...tor.com
Subject: Re: [PATCH] net: fec: Fix build for MCF5272

On Mon, Jun 17, 2013 at 04:11:51PM -0700, David Miller wrote:
> From: Guenter Roeck <linux@...ck-us.net>
> Date: Mon, 17 Jun 2013 13:16:19 -0700
> 
> > Commits 4c09eed9 (net: fec: Enable imx6 enet checksum acceleration) and
> > baa70a5c (net: fec: enable pause frame to improve rx prefomance for 1G
> > network) introduced functionality into the FEC driver which is not
> > supported on MCF5272. As result, building images for MCF5272 fails,
> > complaining about several undefined symbols.
> > 
> > Disabled the added functionality for MCF5272 builds.
> > 
> > Cc: Frank Li <Frank.Li@...escale.com>
> > Cc: Jim Baxter <jim_baxter@...tor.com>
> > Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> > ---
> > Sorry for the added ifdefs. If anyone has a better idea on how to fix
> > the problems, let me know.
> > 
> > This problem exists in 3.9 as well.
> 
> Does the M5272 not have these registers, or have you simply not added
> defines for where there offsets are in that silicon instance?
> 
> I'd much rather you add the register offset defines than pepper the
> entire driver with ifdefs.
> 
I agree, and that would have been my preferred solution as well.
Unfortunately, according to the user manual (MCF5272 ColdFire
Integrated Microprocessor User's Manual), the registers do not exist
on this chip.

Guenter
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