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| author | Antonino A. Daplas <adaplas@gmail.com> | 2005-07-29 22:59:21 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-07-30 10:14:47 -0700 |
| commit | d7a465b4740806e4ee34061ad455595b2fa9fad5 (patch) | |
| tree | 154592d3b2e580412bc833eba99c50772e1f13a0 /Documentation/fb/vesafb.txt | |
| parent | 92ed0223aefa795d1873427e25599cb70b2148ee (diff) | |
[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>
Diffstat (limited to 'Documentation/fb/vesafb.txt')
| -rw-r--r-- | Documentation/fb/vesafb.txt | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/Documentation/fb/vesafb.txt b/Documentation/fb/vesafb.txt index 814e2f56a6a..62db6758d1c 100644 --- a/Documentation/fb/vesafb.txt +++ b/Documentation/fb/vesafb.txt @@ -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 |