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[PATCH] vesafb: Document mtrr boot option usage
Document mtrr boot option usage to Documentation/fb/vesafb.txt.
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
authored by Antonino A. Daplas and committed by Linus Torvalds d7a465b4 92ed0223
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Documentation/fb/vesafb.txt
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Documentation/fb/vesafb.txt
···
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This is the default.
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pmipal Use the protected mode interface for palette changes.
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mtrr setup memory type range registers for the vesafb framebuffer.
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mtrr:n setup memory type range registers for the vesafb framebuffer
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where n:
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0 - disabled (equivalent to nomtrr)
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1 - uncachable
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2 - write-back
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3 - write-combining (default)
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4 - write-through
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If you see the following in dmesg, choose the type that matches the
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old one. In this example, use "mtrr:2".
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...
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mtrr: type mismatch for e0000000,8000000 old: write-back new: write-combining
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...
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nomtrr disable mtrr
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vremap:n
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remap 'n' MiB of video RAM. If 0 or not specified, remap memory