linux-kernel - Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

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Date:	Fri, 8 Jun 2007 17:15:26 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Jared Hulbert <jaredeh@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>, carsteno@...ibm.com,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	richard.griffiths@...driver.com,
	Richard Griffiths <res07ml0@...izon.net>,
	Linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

On Fri, Jun 08, 2007 at 09:11:47AM -0700, Jared Hulbert wrote:
> >On Fri, Jun 08, 2007 at 09:05:32AM -0700, Jared Hulbert wrote:
> >> Okay so we need some driver that opens/closes this ROM.  This has been
> >> done from the dcss block device but that doesn't make sense for most
> >> embedded systems.  The MTD allows for this with point(),unpoint().
> >> That should work just fine.  It does introduce the MTD as a dependancy
> >> which is unnecessary in many systems, but it will work now.
> >
> >The Linux solution to this problem would be to introduce an option for
> >mtd write support.  That way the majority of the code doesn't heave to
> >be compiled for the read-only case but you still get a uniform interface.
> 
> You mean make an MTD-light interface possible?

I wouldn't call it that.  The interface should stay the same except that
write operations are not supported. In mtd_info you'd just have
point/unpoint and read/read_oob but no write operations and all the backing
code wouldn't be compiled in aswell.
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