Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

From: Christoph Hellwig
Date: Fri Jun 08 2007 - 12:15:43 EST

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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