From mboxrd@z Thu Jan  1 00:00:00 1970
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Subject: Re: nap/dfs on 7448
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Leisner, Martin" <Martin.Leisner@xerox.com>
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Date: Tue, 02 Oct 2007 16:01:57 +1000
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On Mon, 2007-10-01 at 17:32 -0400, Leisner, Martin wrote:
> I asked this on linuxppc-embedded a week ago (I didn't even know this
> list existed until last week -- another reason to get rid of
> linuxpcc-embedded).
> 
> Has anyone gotten NAP/DFS to reliably work on a 7448?
> 
> I'm seeing strange problems with peripherals...(using a ram disk
> works fine).

Could it be that your host bridge isn't properly waking up the CPU to
DOZE state for snooping DMA ? (It might require some delays on QACK in
some cases, I know Apple had workarounds in those areas, maybe something
along those lines need to be configured in the chipset).

Ben.