From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marco Stornelli <marco.stornelli@gmail.com>
Subject: Re: [PATCH 06/14] Pramfs: Include files
Date: Wed, 24 Jun 2009 08:32:50 +0200
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To: Arnd Bergmann <arnd@arndb.de>
Cc: David Woodhouse <dwmw2@infradead.org>, =?ISO-8859-1?Q?J=F6rn_Engel?= <joern@lazybastard.org>, Sam Ravnborg <sam@ravnborg.org>, Tim Bird <tim.bird@am.sony.com>, Chris Simmonds <chris@2net.co.uk>, Linux FS Devel <linux-fsdevel@vger.kernel.org>, Linux Embedded <linux-embedded@vger.kernel.org>, Linux Kernel <linux-kernel@vger.kernel.org>

2009/6/23 Arnd Bergmann <arnd@arndb.de>:
> 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 nvr=
am
> is part of an IO memory mapping, you have to do mmap()+memcpy() rathe=
r
> than read(). So dd won't do it, but it's still easy to read from user
> space.

=46or "security" reasons pram reserve the region of memory with
reserve_mem_region_exclusive().....

>
>> I'd definitely recommend making it fixed-endian. Not doing so for JF=
=46S2
>> was a mistake I frequently regretted.
>
> Right.
>
> =A0 =A0 =A0 =A0Arnd <><
>