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Date:	Wed, 25 Jul 2007 17:35:57 -0400
From:	Chris Snook <>
To:	Chuck Ebbert <>
CC:	Jay Cliburn <>,
	Netdev <>,
Subject: Re: atl1 driver corrupting memory?

Chuck Ebbert wrote:
> On 07/25/2007 05:22 PM, Chris Snook wrote:
>> Chuck Ebbert wrote:
>>> I have a report of random errors when using the atl1 driver
>>> with kernel Could that be a problem fixed by the
>>> recent changes to DMA setup in 2.6.23-rc?
>> I hope so.  As far as we can tell the driver and the NIC itself are
>> doing the right thing, and the pci layer or chipset is screwing up the
>> 64-bit DMA.  This only manifests when physical memory addresses cross
>> the 4 GB boundary, and as far as I'm aware atl1 is only used on desktop
>> boards, so we don't have a lot of testers.  If someone wants to buy me
>> and Jay more RAM so we can test it ourselves, I guess we wouldn't object :)
> Our reporter has 8GB of memory in an x86_64 machine.
>> I favor disabling 64-bit DMA in atl1 until Atheros can track this down
>> in the lab.  If we don't get confirmation that this bug is fixed by the
>> DMA changes, I think we should revert to 32-bit DMA for 2.6.23. 
>> Limiting ourselves to 32-bit DMA on desktop systems is a lot less bad
>> than allowing arbitrary memory corruption.
> This is what was committed.

Oh, I thought you were referring to a problem reproduced *after* those changes, 
to be fixed by some generic DMA setup patch.  Has anyone reproduced the problem 
after those changes?

CCing atl1-devel to see if we can get some more testing...

	-- Chris
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