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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>
This commit is contained in:
Antonino A. Daplas 2005-07-29 22:59:21 -07:00 committed by Linus Torvalds
parent 92ed0223ae
commit d7a465b474
1 changed files with 15 additions and 1 deletions
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Documentation/fb/vesafb.txt
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@ -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