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authorAndres Salomon <dilinger@queued.net>2008-04-28 05:14:57 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 11:58:36 -0400
commitfa20c8a6e520d9ccd68c8101155ffdbc19c977c3 (patch)
treea5ffc4f1ae08f7be8a2cb0cdbea7bbf9d64c945f /Documentation
parent0a5e79098799a4bead070a9bd7f1a2213ba5eef5 (diff)
gxfb: replace FBSIZE config option with a module parameter
Use a command line option (vram) rather than hardcoding the vram size. LxFB already does this; it's useful for machines that can't query the BIOS for fb size. This patch originated from David Woodhouse, was modified by Jordan Crouse, and was then modified further by me. This also adds some gxfb documentation in Documentation/fb. Signed-off-by: Andres Salomon <dilinger@debian.org> Cc: Jordan Crouse <jordan.crouse@amd.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/fb/gxfb.txt51
1 files changed, 51 insertions, 0 deletions
diff --git a/Documentation/fb/gxfb.txt b/Documentation/fb/gxfb.txt
new file mode 100644
index 000000000000..b56096142017
--- /dev/null
+++ b/Documentation/fb/gxfb.txt
@@ -0,0 +1,51 @@
1[This file is cloned from VesaFB/aty128fb]
2
3What is gxfb?
4=================
5
6This is a graphics framebuffer driver for AMD Geode GX2 based processors.
7
8Advantages:
9
10 * No need to use AMD's VSA code (or other VESA emulation layer) in the
11 BIOS.
12 * It provides a nice large console (128 cols + 48 lines with 1024x768)
13 without using tiny, unreadable fonts.
14 * You can run XF68_FBDev on top of /dev/fb0
15 * Most important: boot logo :-)
16
17Disadvantages:
18
19 * graphic mode is slower than text mode...
20
21
22How to use it?
23==============
24
25Switching modes is done using gxfb.mode_option=<resolution>... boot
26parameter or using `fbset' program.
27
28See Documentation/fb/modedb.txt for more information on modedb
29resolutions.
30
31
32X11
33===
34
35XF68_FBDev should generally work fine, but it is non-accelerated.
36
37
38Configuration
39=============
40
41You can pass kernel command line options to gxfb with gxfb.<option>.
42For example, gxfb.mode_option=800x600@75.
43Accepted options:
44
45mode_option - specify the video mode. Of the form
46 <x>x<y>[-<bpp>][@<refresh>]
47vram - size of video ram (normally auto-detected)
48
49
50--
51Andres Salomon <dilinger@debian.org>