From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Pflug <andreas.pflug@web.de>
Subject: [BUG] EDAC infomation partially missing
Date: Wed, 20 Jan 2016 16:01:52 +0100
Message-ID: <569FA160.6070308__10443.513634573$1453302312$gmane$org@web.de>
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Initially reported to debian
(http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=810964), redirected here:

With AMD Opteron 6xxx processors, half of the memory controllers are
missing from /sys/devices/system/edac/mc
Checked with single 6120 (dual memory controller) and twin 6344 (2x dual
MC), other dual-module CPUs might be affected too.

Booting plain Linux (3.2, 3.16, 4.1, 4.3), all memory controllers are
listed under /sys/devices/system/edac/mc as expected. Same happens, when
Xen 4.1 is used: all MCs present.

Starting with Xen 4.4 (Debian Jessie), only mc1 (on the single CPU
machine) or mc2/mc3 (dual CPU machine) are present, although the full
system memory is accessible. Checked versions were 4.1.4 (Debian
Wheezy), 4.4.1 (Jessie) and 4.6.0 (Sid)