Gary Jennejohn wrote:
> On Fri, 28 Nov 2008 15:28:35 +0200
> Andriy Gapon <[EMAIL PROTECTED]> wrote:
>
> >
> > I have a new machine with DG33TL mainboard (ICH9/G33).
> > In a course of some hacking I ran dd if=/dev/mem ... to scan all memory,
> > this caused the machine to hang.
> > I tried to reproduce and this is 100% reproducible.
> >
> > I am not used to such behavior. In older days I could scan all the
> > memory without any issues.
> >
> > Could this be related to some modern form of memory-mapped IO? Or to
> > Intel Management Engine (that seems t bite into DRAM)?
> > Or something else?
> >
> > Just wondering.
> >
>
> That's what I would assume. With some hardware just reading a register
> can be harmful.
I just crashed 3 normally stable machines trying that.
I only tried for casual interest. I acknowledge Gary's comment above :-)
dd if=/dev/mem of=/dev/null
FreeBSD lapa.js.berklix.net 4.11-RELEASE FreeBSD 4.11-RELEASE
#0: Fri Jul 7 17:56:30 CEST 2006
[EMAIL PROTECTED]:/usr/src/sys/compile/LAPA.small i386
FreeBSD laps.js.berklix.net 7.0-RELEASE FreeBSD 7.0-RELEASE
#2: Mon Sep 8 15:39:53 CEST 2008
[EMAIL
PROTECTED]:/usr1/ftp/pri/FreeBSD/releases/7.0-RELEASE/src/sys/i386/compile/LAPS.small
i386
FreeBSD john.js.berklix.net 7.1-BETA2 FreeBSD 7.1-BETA2 #0:
Sun Oct 12 20:59:28 UTC 2008
[EMAIL PROTECTED]:/usr/obj/usr/src/sys/GENERIC amd64
Cheers,
Julian
--
Julian Stacey: BSDUnixLinux C Prog Admin SysEng Consult Munich www.berklix.com
Mail plain ASCII text. HTML & Base64 text are spam. www.asciiribbon.org
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