Date: Mon, 7 Jan 2013 12:38:55 +0100
From: Daniel =?iso-8859-1?Q?Gl=F6ckner?= <daniel-gl@gmx.net>
To: linux-media@vger.kernel.org
Subject: cx88 WRITERM instruction
Message-ID: <20130107113855.GA15241@minime.bse>
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Sender: linux-media-owner@vger.kernel.org

Hi,

I'm trying to add precise timestamps to the cx88 driver but I
somehow fail to use the WRITERM instruction correctly. Has anyone
ever successfully used that RISC instruction? Is there a bit that
needs to be flipped to actually make it perform writes to the PCI
bus?

I know it is executed because I get a RISC_RD_BERR_INT if I
replace the third word with junk but no matter what I do the target
memory stays untouched (yes, it is coherent memory and I use the DMA
address).

Thanks,

  Daniel