MFC r268624 by nwhitehorn:
MFC r268624 by nwhitehorn:

  On my Lenovo laptop, the firmware maps the EFI framebuffer with MTRRs
  set to uncacheable. This leads to execrable console performance. Once
  PMAP is up, remap the framebuffer as write-combining. This reduces
  boot time on my laptop by 60% when booting with EFI.

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