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Commit d7a465b4 authored by Antonino A. Daplas's avatar Antonino A. Daplas Committed by Linus Torvalds
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[PATCH] vesafb: Document mtrr boot option usage 



Document mtrr boot option usage to Documentation/fb/vesafb.txt.

Signed-off-by: default avatarAntonino Daplas <adaplas@pol.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 92ed0223

Documentation/fb/vesafb.txt

+15 −1
Original line number Diff line number Diff line
@@ -144,7 +144,21 @@ vgapal Use the standard vga registers for palette changes. 
	This is the default.

pmipal	Use the protected mode interface for palette changes.



mtrr	setup memory type range registers for the vesafb framebuffer.

mtrr:n	setup memory type range registers for the vesafb framebuffer

	where n:

	      0 - disabled (equivalent to nomtrr)

	      1 - uncachable

	      2 - write-back

	      3 - write-combining (default)

	      4 - write-through



	If you see the following in dmesg, choose the type that matches the

	old one. In this example, use "mtrr:2".

...

mtrr: type mismatch for e0000000,8000000 old: write-back new: write-combining

...



nomtrr  disable mtrr



vremap:n

        remap 'n' MiB of video RAM. If 0 or not specified, remap memory