From d7a465b4740806e4ee34061ad455595b2fa9fad5 Mon Sep 17 00:00:00 2001 From: "Antonino A. Daplas" Date: Fri, 29 Jul 2005 22:59:21 -0700 Subject: [PATCH] vesafb: Document mtrr boot option usage Document mtrr boot option usage to Documentation/fb/vesafb.txt. Signed-off-by: Antonino Daplas Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/fb/vesafb.txt | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'Documentation/fb') diff --git a/Documentation/fb/vesafb.txt b/Documentation/fb/vesafb.txt index 814e2f56a6ad..62db6758d1c1 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 -- cgit v1.2.3-59-g8ed1b