linux-kernel - RE: [PATCH 6/8] drivers: add Contiguous Memory Allocator

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Message-id: <007801cc3bf4$01fdefe0$05f9cfa0$%szyprowski@samsung.com>
Date:	Wed, 06 Jul 2011 17:47:27 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	'Russell King - ARM Linux' <linux@....linux.org.uk>
Cc:	'Arnd Bergmann' <arnd@...db.de>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
	linux-mm@...ck.org, linaro-mm-sig@...ts.linaro.org,
	'Daniel Walker' <dwalker@...eaurora.org>,
	'Jonathan Corbet' <corbet@....net>,
	'Mel Gorman' <mel@....ul.ie>,
	'Chunsang Jeong' <chunsang.jeong@...aro.org>,
	'Michal Nazarewicz' <mina86@...a86.com>,
	'Jesse Barker' <jesse.barker@...aro.org>,
	'Kyungmin Park' <kyungmin.park@...sung.com>,
	'Ankita Garg' <ankita@...ibm.com>,
	'Andrew Morton' <akpm@...ux-foundation.org>,
	'KAMEZAWA Hiroyuki' <kamezawa.hiroyu@...fujitsu.com>
Subject: RE: [PATCH 6/8] drivers: add Contiguous Memory Allocator

Hello,

On Wednesday, July 06, 2011 5:37 PM Russell King - ARM Linux wrote:

> On Wed, Jul 06, 2011 at 04:56:23PM +0200, Marek Szyprowski wrote:
> > This will not solve our problems. We need CMA also to create at least one
> > device private area that for sure will be in low memory (video codec).
> 
> You make these statements but you don't say why.  Can you please
> explain why the video codec needs low memory - does it have a
> restricted number of memory address bits which it can manipulate?

Nope, it only needs to put some type of memory buffers in first bank 
(effectively in 30000000-34ffffff area) and the others in the second bank
(40000000-57ffffff area). The values are given for Samsung GONI board.

Best regards
-- 
Marek Szyprowski
Samsung Poland R&D Center


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