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

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Message-Id: <201012172208.17937.rob@landley.net>
Date:	Fri, 17 Dec 2010 22:08:16 -0600
From:	Rob Landley <rob@...dley.net>
To:	dedekind1@...il.com
Cc:	Jason Lunz <lunz@....org>,
	Denys Vlasenko <vda.linux@...glemail.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 Thursday 16 December 2010 09:18:31 Artem Bityutskiy wrote:
> On Wed, 2010-12-15 at 00:31 -0600, Rob Landley wrote:
> > That is awesome and I'm not finding any documentation on it...  Ah:
> >
> >  
> > http://wiki.maemo.org/Modifying_the_root_image#Block_device_emulating_an_
> >MTD_device
> >
> > Wow that's awkward.  Let's see, that says...
> >
> >   mknod /tmp/mtdblock0 b 31 0
> >   modprobe loop
> >   losetup /dev/loop0 rootfs.jffs2
> >   modprobe mtdblock
> >   modprobe block2mtd
> >   # Note the ,128KiB is needed (on 2.6.26 at least) to set the
> >   # eraseblock  size.
> >   echo "/dev/loop0,128KiB" > /sys/module/block2mtd/parameters/block2mtd
> >   modprobe jffs2
> >   mount -t jffs2 /tmp/mtdblock0 /media/jffs2
>
> You should not need mtdblock in modern kernels, it is legacy. You should
> be abole to mount jffs2 on top of mtd0 with
>
> mount -t jffs2 mtd0 /media/jffs2

How does one associate the mtd0 with the loopback device?  (I thought mtd0 was 
for actual flash memory.)

Rob
-- 
GPLv3: as worthy a successor as The Phantom Menace, as timely as Duke Nukem 
Forever, and as welcome as New Coke.
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