From: David Woodhouse <dwmw2@infradead.org>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: linuxppc-dev@ozlabs.org, linux-mtd@lists.infradead.org
Subject: Re: jffs2 and unaligned access
Date: Wed, 07 May 2008 11:53:49 +0100 [thread overview]
Message-ID: <1210157630.25560.884.camel@pmac.infradead.org> (raw)
In-Reply-To: <20080507102724.GE4326@pengutronix.de>
On Wed, 2008-05-07 at 12:27 +0200, Sascha Hauer wrote:
> memcpy_from/to_io() use word aligned accesses on the io side of memory.
> The MPC5200 local plus bus where our flashes are connected does not
> allow unaligned accesses, so we have to use the io versions of memcpy.
But this region of flash is marked as suitable for execute-in-place,
otherwise the point() function wouldn't be working to give a direct
pointer to it. It sounds like we shouldn't be allowing that.
Which in turn means that perhaps we should have a property in the
corresponding node in the device-tree which indicates that it's not
suitable for direct access?
--
dwmw2
next parent reply other threads:[~2008-05-07 10:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20080507102724.GE4326@pengutronix.de>
2008-05-07 10:53 ` David Woodhouse [this message]
2008-05-07 13:25 ` jffs2 and unaligned access Sascha Hauer
2008-06-05 21:38 ` Jon Smirl
2008-05-07 20:42 ` Segher Boessenkool
2008-05-08 13:19 ` Detlev Zundel
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