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*tinfoil hat* These almost look like magic values, maybe some production debug/verification ranges with special decoder behaviour? 2005, 2011, 2013, 2013(.5) all look like years. 40004000 is too pretty to be accidental.
20000000-201fffff and 40004000-40004fff are "used by 'pnp 00:08'" on my system, which is either related to the culprit, or a BIOS workaround (Ivy Bridge here). Trying to find out what pnp 00:08 is.
Not there on Skylake or Nehalem, so sounds like you're on the right track.
Looks like a BIOS workaround to just reserve the RAM. Also, under some conditions, apparently the ranges need to be broader?pic.twitter.com/EQdXLghWg8
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