linux-kernel - Re: [PATCH] mtd: allow mtd and jffs2 when ARCH=um

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Date:	Wed, 15 Dec 2010 09:18:33 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Jason Lunz <lunz@....org>
Cc:	Rob Landley <rob@...dley.net>, dedekind1@...il.com,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	Sam Ravnborg <sam@...nborg.org>,
	David Woodhouse <dwmw2@...radead.org>,
	atom ota <atomota@...epyhammer.com>,
	user-mode-linux-devel@...ts.sourceforge.net,
	Jeff Dike <jdike@...toit.com>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-mtd@...ts.infradead.org
Subject: Re: [PATCH] mtd: allow mtd and jffs2 when ARCH=um

On Wed, Dec 15, 2010 at 02:19, Jason Lunz <lunz@....org> wrote:
> On Tue, Dec 14, 2010 at 06:49:02PM -0600, Rob Landley wrote:
>> The problem is that jffs2 is a filesystem, and thus something people would
>> really like to be able to loopback mount, but it's hardwired to assume it's
>> only ever stored on a certain type of hardware, and thus requies incestuous
>> knowledge of the erase granularity of the flash layer in order to function.
>
> I assume you can turn your jffs2 image file into a block dev using
> losetup, then turn the corresponding loop device into an mtd device
> using block2mtd, at which point you ought to be able to mount it with
> jffs2. I've never tried it.

And block2mtd is part of mtd, so you have to get mtd compiled first.

BTW, the patch I used in the past was less intrusive than yours.
I attached it, as I can't send it inline from here.
Note that it was against 2.6.31-rc4.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

View attachment "uml-mtd.diff" of type "text/x-patch" (3089 bytes)