linux-kernel - RE: [RFC 1/8] drivers: add generic remoteproc framework

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Date:	Mon, 27 Jun 2011 23:54:30 +0000
From:	"Grosen, Mark" <mgrosen@...com>
To:	Grant Likely <grant.likely@...retlab.ca>
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>,
	"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 1/8] drivers: add generic remoteproc framework

> From: Grant Likely
> Sent: Monday, June 27, 2011 3:24 PM

> > Our AMPs (remote processors) have a variety of boot mechanisms that vary
> > across the different SoCs (yes, TI likes HW diversity). In some cases, the
> > boot address is more like an entry point and that comes from the firmware,
> > so it is not a static attribute of a driver. Correct me if I misunderstood
> > your question.
> 
> More to the point, I would expect the boot_address to be a property of
> the rproc instance because it represents the configuration of the
> remote processor.  It seems odd that the caller of ->start would know
> better than the rproc driver about the entry point of the processor.
> 
> g.

Yes, in many cases the boot_address will be defined by the HW. However, we have
processors that are "soft" - the boot_address comes from the particular firmware
being loaded and can (will) be different with each firmware image. We factored
out the firmware loader to be device-independent (in remoteproc.c) so it's not
repeated in each device-specific implementation like omap_remoteproc.c and
davinci_remoteproc.c. In the cases where the HW dictates what happens, the start()
method should just ignore the boot_address.

Mark

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