linux-kernel - Re: [PATCH 06/14] Pramfs: Include files

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Message-Id: <200906232355.34134.arnd@arndb.de>
Date:	Tue, 23 Jun 2009 23:55:32 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Jörn Engel <joern@...ybastard.org>,
	Marco <marco.stornelli@...il.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Tim Bird <tim.bird@...sony.com>,
	Chris Simmonds <chris@...t.co.uk>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/14] Pramfs: Include files

On Tuesday 23 June 2009, David Woodhouse wrote:
> And dd on /dev/mem would work, surely?

Actually, reading from /dev/mem is only valid on real RAM. If the nvram
is part of an IO memory mapping, you have to do mmap()+memcpy() rather
than read(). So dd won't do it, but it's still easy to read from user
space.

> I'd definitely recommend making it fixed-endian. Not doing so for JFFS2
> was a mistake I frequently regretted.

Right.

	Arnd <><
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