linux-kernel - DMA setup for ARM platform with hole low in memory

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Message-ID: <315025466.1505794.1308000719987.JavaMail.root@sz0140a.emeryville.ca.mail.comcast.net>
Date:	Mon, 13 Jun 2011 21:31:59 +0000 (UTC)
From:	johnlinn@...cast.net
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: DMA setup for ARM platform with hole low in memory

I'm trying to decide the best way to setup this ARM platform DMA to deal with the fact that the lowest 512K of memory can not be DMAed into.  The rest of memory space is fine.

>From my digging and prototyping it seems like a DMA zone will do the job, but maybe there's an easier way. The DMA mask doesn't seem to really help with this hole in memory and would still need to be 0xFFFFFFFF it appears.

Am I missing the easier way?

Thanks,
John
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