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bbfa235
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(Get the code!)
I am suspicious that the following mtrrs though reasonable looking are actually the issue:
[ 0.000000] MTRR variable ranges enabled:
[ 0.000000] 0 base 000000000 mask F80000000 write-back
[ 0.000000] 1 base 07E800000 mask FFF000000 uncachable
[ 0.000000] 2 base 07F800000 mask FFF800000 uncachable
[ 0.000000] 3 base 07E700000 mask FFFF00000 uncachable
Note that 1 and 2 overlap, this is normally a situation which triggers 'undefined' behaviour including doing utterly the wrong thing. We should try booting with enable_mtrr_cleanup and see if that helps any.