linux-kernel - Re: [PATCH] ARM: dma-mapping: highbank: Restrict DMA to 32-bit addresses

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Date:	Thu, 1 Aug 2013 21:45:52 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Andreas Herrmann <andreas.herrmann@...xeda.com>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Hiroshi Doyu <hdoyu@...dia.com>,
	Will Deacon <will.deacon@....com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dma-mapping: highbank: Restrict DMA to 32-bit
	addresses

On Thu, Aug 01, 2013 at 10:40:47PM +0200, Andreas Herrmann wrote:
> 
> Some devices on Calxeda ECX-2000 are restricted to 32-bit DMA. Thus
> the platform needs to set dma_zone_size, otherwise dma-mapping code is
> complaining, e.g.
> 
>   calxedaxgmac fff50000.ethernet: coherent DMA mask 0xffffffff is smaller than system
>     GFP_DMA mask 0xffffffffffffffff
> 
> Same is true for sata_highbank. For the latter dma_coherent_mask could
> be increased but due to the lack of DMA32 zone we need to adapt
> arm_dma_limit in general.

Please wait until I post my dma mask patches.  Thanks.
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