Re: [PATCH] Use MTRRs by default for vesafb on x86-64

[Etienne Lorrain]

  Whatever the processor, you cannot use write combining MTRR
 on 16 colors / 4 BPP modes. In this mode you can copy
 8 pixels at a time by doing a simple movb, but it cannot
 handle 32 pixel copy at the same time by a movd, for instance.
 In 16 color modes, you never have a linear memory mapping
 of pixels.

  Etienne.

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