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From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: AT91SAM9G45: MACB: not usable Ethernet when MMU is enabled
Date: Fri, 2 Mar 2012 18:16:23 +0100	[thread overview]
Message-ID: <20120302171623.GC12248@game.jcrosoft.org> (raw)
In-Reply-To: <20120302153559.GP3852@pengutronix.de>

On 16:35 Fri 02 Mar     , Sascha Hauer wrote:
> On Fri, Mar 02, 2012 at 03:12:46PM +0200, RONETIX - Asen Dimov wrote:
> > Hello everyone,
> > 
> > the Ethernet on AT91SAM9G45(with ARM926J CPU) is not operational
> > when the MMU is enabled.
> > Have some met with this issue before and probably solved it?
> 
> grep for dma_alloc_coherent, dma_flush_range. This should give you the
> hints necessary to make it work.
I found back some patch to support it

the main issue is "bug" in the network stack of barebox
the send buffer is not allocated via dma_alloc_coherent so it's cdoes not work

on the macb you need the send and the receive buffer allocated via
dam_alloc_coherent

I'll send some patch

Best Regards,
J.

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      reply	other threads:[~2012-03-02 17:26 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-02 13:12 RONETIX - Asen Dimov
2012-03-02 13:16 ` Jean-Christophe PLAGNIOL-VILLARD
2012-03-02 15:35 ` Sascha Hauer
2012-03-02 17:16   ` Jean-Christophe PLAGNIOL-VILLARD [this message]

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