From: Tony Lindgren <tony@atomide.com>
To: Philip Balister <philip@balister.org>
Cc: "linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>
Subject: Re: DMA example
Date: Wed, 24 Feb 2010 12:35:56 -0800 [thread overview]
Message-ID: <20100224203555.GT28173@atomide.com> (raw)
In-Reply-To: <4B857F2F.7000201@balister.org>
* Philip Balister <philip@balister.org> [100224 11:31]:
> I am trying to setup a dma operation to copy memory from GPMC
> address space into RAM. The only examples using the omap-dma api use
> hardware triggers.
>
> When I start a transfer, I end up with a DMA transaction error when
> I start the transfer.
>
> Does anyone have a good example of a software transfer? Currently, I
> am tracing the omap dma api to see how things map into the registers
> ....
Enjoy the GPMC timings. I recommend attaching a logic analyzer there
to verify the things are right for the key lines if you have chance.
Hmm I thought the hardware triggers were optional in at least
drivers/usb/musb/tusb6010_omap.c.. Maybe I don't remember correctly.
Regards,
Tony
next prev parent reply other threads:[~2010-02-24 20:35 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-24 19:34 DMA example Philip Balister
2010-02-24 20:35 ` Tony Lindgren [this message]
2010-02-24 22:31 ` Philip Balister
2010-02-24 22:52 ` Tony Lindgren
2010-02-25 2:24 ` Philip Balister
2010-02-25 4:26 ` Philip Balister
2010-02-25 4:59 ` Shilimkar, Santosh
2010-02-25 6:22 ` Venkatraman S
2010-02-24 20:48 ` Shilimkar, Santosh
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