Date: Fri, 28 Nov 2008 15:28:35 +0200 From: Andriy Gapon <avg@icyb.net.ua> To: freebsd-hardware@freebsd.org, freebsd-hackers@freebsd.org Subject: dd if=/dev/mem can hang a machine? Message-ID: <492FF203.5060405@icyb.net.ua>
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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. -- Andriy Gapon
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