linux-kernel - Re: [PATCH] ARM: zynq: Add OCM driver

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Message-ID: <e870cbc7-5934-4a14-aab4-416cdfd1627d@VA3EHSMHS007.ehs.local>
Date:	Tue, 11 Mar 2014 15:13:59 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Olof Johansson <olof@...om.net>
CC:	Michal Simek <michal.simek@...inx.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Michal Simek <monstr@...str.eu>,
	Josh Cartwright <josh.cartwright@...com>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Rob Herring <robherring2@...il.com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: zynq: Add OCM driver

On Tue, 2014-03-11 at 02:31PM -0700, Olof Johansson wrote:
> Hi Michal,
> 
> Sorry for the late review, I didn't notice the driver when it was
> posted and I only saw it now with the pull request. Comments below.
> 
> 
> On Mon, Jan 6, 2014 at 7:36 AM, Michal Simek <michal.simek@...inx.com> wrote:
> > The driver provide memory allocator which can
> > be used by others drivers to allocate memory inside OCM.
> > All location for 64kB blocks are supported
> > and driver is trying to allocate the largest continuous
> > block of memory.
> 
> I don't think you explain what OCM is anywhere, what is it? Since
> you're reusing the generic SRAM driver I'm suspecting it's related?

It stands for 'On-Chip Memory'. For Zynq that is a RAM consisting of
four 64k chunks that can be individually mapped to a high or low address.

	Sören


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