From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Fri, 29 Apr 2005 17:49:51 -0400
From: Ralph Siemsen <ralphs@netwinder.org>
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To: Sam Pham <anhmn@yahoo.com>
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Cc: linux-mtd@lists.infradead.org
Subject: Re: mtd emulation
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Sam Pham wrote:
> I'd like to evaluate JFFS2.  Has anyone done this
> before?  Does linux have the capability of emulating
> mtd block device and mtd memory so that I can run
> JFFS2 on top of it without using the actual flash?

I believe you can use MTD_MTDRAM for this.  There are a few associated 
parameters (total size, erase block size) to be fiddled as well.  See 
the the file linux-2.6.x/drivers/mtd/devices/mtdram.c

-R