From owner-freebsd-questions@FreeBSD.ORG  Fri Jul 30 05:26:41 2010
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Date: Fri, 30 Jul 2010 00:01:04 -0500
From: Steven Susbauer <steven@too1337.com>
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Cc: EforeZZ <eforezz@gmail.com>
Subject: Re: Firewire RAM access
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On 07/27/10 07:38, EforeZZ wrote:
> Hi,
>
> I was playing around with fwcontrol and its "-m" switch.
> I connected my FreeBSD 7.2 notebook to Win7 PC Via firewire and
> attempted to access Win7's RAM through the /dev/fwmem interface. I
> failed.
>
<snip>
> The question is.. Should this always work? As far as I know I should
> be able to access other PC's RAM through the firewire connection
> without any support from the connected PC's OS, right?
>
> Best regards,
> EforeZZ

According to this page for the Linux mem1394 driver, the host can set up 
a filter to block it, and Windows appears to do so 
(http://johannes.sipsolutions.net/Projects/mem1394).

  -Steve