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Re: [BUG?] cavium cn56xx and dma_map_single warning

from [David Daney] [Permanent Link][Original]
To: Zhuang Yuyao <mlistz@gmail.com>
Subject: Re: [BUG?] cavium cn56xx and dma_map_single warning
From: David Daney <ddaney@caviumnetworks.com>
Date: Wed, 24 Mar 2010 09:27:08 -0700
Cc: linux-mips@linux-mips.org
In-reply-to: <e732b6801003221845i4f86ff8ftea56d656bfd20f10@mail.gmail.com>
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References: <e732b6801003220001m7e08bbf7w20ba62d42f30a190@mail.gmail.com> <4BA79E69.1040803@caviumnetworks.com> <e732b6801003221830y2c2ca423tb67d74f7a3639c22@mail.gmail.com> <4BA81BC7.5060600@caviumnetworks.com> <e732b6801003221845i4f86ff8ftea56d656bfd20f10@mail.gmail.com>
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On 03/22/2010 06:45 PM, Zhuang Yuyao wrote:

On Tue, Mar 23, 2010 at 9:39 AM, David Daney<ddaney@caviumnetworks.com>  wrote:


The issue is maintaining mappings for 32-bit PCI devices.  If you only want
to support 64-bit devices, it would be easier to address the issue.

David Daney



Wow, that is a great news, I do not known if my adaptec 3045e raid
card is a 64bit device, but if I only want to support 64bit devices,
Is there a quick fix for it?
I don't know. You could try to make all DMA accesses go via BAR2. That would break many 32-bit devices though. 

David Daney


Zhuang Yuyao
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