From: robherring2@gmail.com (Rob Herring)
To: linux-arm-kernel@lists.infradead.org
Subject: PL330 alignment requirement questions
Date: Fri, 08 Jul 2011 17:04:34 -0500 [thread overview]
Message-ID: <4E177EF2.9010900@gmail.com> (raw)
In-Reply-To: <2034464824.379455.1310162217325.JavaMail.root@sz0140a.emeryville.ca.mail.comcast.net>
On 07/08/2011 04:56 PM, johnlinn at comcast.net wrote:
> I'm testing our PL330 with the driver/dma/pl330 driver and see some
> strangeness that's probably my own setup issue.
>
> I'm also using drivers/dmatest to test it with memory to memory
> copies. I'm seeing that the copy alignment (copy_align) is not setup
> (it's 0) such that I see errors on some transfers at the end of the
> transfer.
>
> If I setup the copy_align to be 3 or larger then I don't see these
> errors. This number doesn't make much sense to me and I'm digging
> into the details (seems like 4 would make sense). I just wanted to
> see if anyone had tested with dmatest and seen anything similar.
>
I ran this dmatest with Versatile Express and the example FPGA image
from ARM with the PL330 and also saw errors. You've narrowed it down
farther than I did and I don't have it setup currently.
Rob
next prev parent reply other threads:[~2011-07-08 22:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1866031594.379248.1310161913147.JavaMail.root@sz0140a.emeryville.ca.mail.comcast.net>
2011-07-08 21:56 ` PL330 alignment requirement questions johnlinn at comcast.net
2011-07-08 22:04 ` Rob Herring [this message]
2011-07-08 22:07 ` johnlinn at comcast.net
2011-07-09 1:56 ` Jassi Brar
2011-07-11 15:58 ` John Linn
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