From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lars-Peter Clausen <lars@metafoo.de>
Subject: Re: [PATCH RFC 1/8] powerpc: mpc512x_dma: add support for data
 transfers between memory and i/o memory
Date: Sun, 14 Jul 2013 12:05:25 +0200
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To: Gerhard Sittig <gsi@denx.de>
Cc: Arnd Bergmann <arnd@arndb.de>, Vinod Koul <vinod.koul@intel.com>, devicetree-discuss@lists.ozlabs.org, Alexander Popov <a13xp0p0v88@gmail.com>, Dan Williams <djbw@fb.com>, Anatolij Gustschin <agust@denx.de>, linuxppc-dev@lists.ozlabs.org
List-Id: devicetree@vger.kernel.org

On 07/12/2013 05:26 PM, Gerhard Sittig wrote:
[...]
]
> +		if (mchan->tcd_nunits)
> +			tcd->nbytes = mchan->tcd_nunits * 4;
> +		else
> +			tcd->nbytes = 64;

Just wondering where does the magic 64 come from?