netdev - Re: [PATCH 02/12] fs_enet: Add MPC5121 FEC support.

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Date:	Tue, 19 May 2009 08:17:31 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Piotr Zięcik <kosmo@...ihalf.com>,
	Wolfgang Denk <wd@...x.de>,
	Scott Wood <scottwood@...escale.com>,
	John Rigby <jrigby@...il.com>, linuxppc-dev@...abs.org,
	Detlev Zundel <dzu@...x.de>, netdev@...r.kernel.org,
	Kumar Gala <galak@...nel.crashing.org>,
	Becky Bruce <Becky.Bruce@...escale.com>
Subject: Re: [PATCH 02/12] fs_enet: Add MPC5121 FEC support.

On Thu, 2009-05-14 at 08:00 -0600, Grant Likely wrote:
> 
> All of this doesn't actually affect the driver code at all.  It's all
> handled by the kernel and the DMA apis.  What it does affect is
> multiplatform kernels.  The DMA behaviour is set at compile time, not
> run time, depending on the setting of CONFIG_NON_COHERENT_CACHE (see
> arch/powerpc/platforms/Kconfig.cputype).  A kernel which has it on
> won't run properly on a platform which has it off, and visa-versa.

We are close to the point where we can make this a runtime option
though, by just having a different set of dma_ops hooked in.

Cheers,
Ben.


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