linux-kernel - RE: [RFC 5/8] remoteproc: add davinci implementation

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Date:	Wed, 6 Jul 2011 10:06:16 +0530
From:	"Nori, Sekhar" <nsekhar@...com>
To:	"Grosen, Mark" <mgrosen@...com>,
	Sergei Shtylyov <sshtylyov@...sta.com>
CC:	Ohad Ben-Cohen <ohad@...ery.com>,
	davinci-linux-open-source 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Arnd Bergmann <arnd@...db.de>,
	Brian Swetland <swetland@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [RFC 5/8] remoteproc: add davinci implementation

Hi Mark,

On Tue, Jul 05, 2011 at 22:24:21, Grosen, Mark wrote:
> > From: Nori, Sekhar
> > Sent: Monday, July 04, 2011 10:35 PM
> > To: Grosen, Mark; Sergei Shtylyov
> 
> ...
> > > > Since procedure to set the boot address varies across DaVinci
> > > > platforms, you could have a callback populated in platform data
> > > > which will be implemented differently for original DaVinci and
> > > > DA8xx devices.
> > >
> > > I looked at DM6467 and it's the same as OMAPL13x, except at a
> > different
> > > address. Rather than a callback, it could be just an address in the
> > > platform data.
> > 
> > Sounds okay as long as _all_ the DaVinci devices have the same
> > bit to be set. Plus, I hope there are no other users of the
> > register so that there is no race with other platform code using
> > the same register.
> 
> Sekhar,
> 
> The register is a dedicated 32-bit register that holds the start/boot
> address for the DSP, so no other platform code should be using it. Once
> the LRST is de-asserted (via the PSC code enhancement), the DSP starts
> execution at the address in this register.

Okay. I had misunderstood this as a bit which is used to reset the DSP.
Thanks for clarifying.
 
Regards,
Sekhar

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