path: root/Documentation/fb/vesafb.txt
diff options
authorAntonino A. Daplas <adaplas@gmail.com>2005-07-29 22:59:21 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-30 10:14:47 -0700
commitd7a465b4740806e4ee34061ad455595b2fa9fad5 (patch)
tree154592d3b2e580412bc833eba99c50772e1f13a0 /Documentation/fb/vesafb.txt
parent92ed0223aefa795d1873427e25599cb70b2148ee (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')
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
remap 'n' MiB of video RAM. If 0 or not specified, remap memory