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

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Date:	Fri, 8 Jun 2007 09:02:06 -0700
From:	"Jared Hulbert" <jaredeh@...il.com>
To:	"Christoph Hellwig" <hch@...radead.org>,
	"Jared Hulbert" <jaredeh@...il.com>, 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 6/8/07, Christoph Hellwig <hch@...radead.org> wrote:
> On Thu, Jun 07, 2007 at 01:34:12PM -0700, Jared Hulbert wrote:
> > >And we'll need that even when using cramfs.  There's not way we'd
> > >merge a hack where the user has to specify a physical address on
> > >the mount command line.
> >
> > Why not?  For the use case in question the user usually manually
> > burned the image to a physical address before hand.  Many of these
> > system don't have MTD turned on for this Flash, they don't need it
> > because they don't write to this Flash once the system is up.
>
> Then add a small device layer for it.  Remember that linux is not all
> about hacked up embedded devices that get shipped once and never
> touched again.

Remember that linux is not all about big iron machines with lots of
processors and gigabytes of RAM :)

I concede your layer point, ioremap() doesn't belong in the filesystem.
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