linux-kernel - Re: [PATCH 3/3 v2] dmaengine: Add Freescale i.MX SDMA support

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Message-ID: <20100830125556.GL1473@pengutronix.de>
Date:	Mon, 30 Aug 2010 14:55:56 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Linus Walleij <linus.ml.walleij@...il.com>
Cc:	Marek Vasut <marek.vasut@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 3/3 v2] dmaengine: Add Freescale i.MX SDMA support

On Sun, Aug 29, 2010 at 02:35:01PM +0200, Linus Walleij wrote:
> 2010/8/28 Sascha Hauer <s.hauer@...gutronix.de>:
> 
> > Peripherals integrated into a SoC like the SDMA engine here are
> > normally accessible in native endianess and thus need the __raw_*
> > functions.
> 
> So the SDMA actually switch and twist around the endianness of
> its registers if it's synthesized into a bigendian version of the system?
> 
> Or hardware-dynamically even depending on the setting of the
> endianness bit in the ARM core?

I think it's the bus between the ARM core and the periherals which
changes the endianess. I have never tried running an i.MX in big endian
mode, so I can only guess how the system really behaves in BE mode.

Sascha

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