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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/fb/pvr2fb.txt
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+$Id: pvr2fb.txt,v 1.1 2001/05/24 05:09:16 mrbrown Exp $
+
+What is pvr2fb?
+===============
+
+This is a driver for PowerVR 2 based graphics frame buffers, such as the
+one found in the Dreamcast.
+
+Advantages:
+
+ * It provides a nice large console (128 cols + 48 lines with 1024x768)
+ without using tiny, unreadable fonts.
+ * You can run XF86_FBDev on top of /dev/fb0
+ * Most important: boot logo :-)
+
+Disadvantages:
+
+ * Driver is currently limited to the Dreamcast PowerVR 2 implementation
+ at the time of this writing.
+
+Configuration
+=============
+
+You can pass kernel command line options to pvr2fb with
+`video=pvr2fb:option1,option2:value2,option3' (multiple options should be
+separated by comma, values are separated from options by `:').
+Accepted options:
+
+font:X - default font to use. All fonts are supported, including the
+ SUN12x22 font which is very nice at high resolutions.
+
+mode:X - default video mode. The following video modes are supported:
+ 640x240-60, 640x480-60.
+
+ Note: the 640x240 mode is currently broken, and should not be
+ used for any reason. It is only mentioned as a reference.
+
+inverse - invert colors on screen (for LCD displays)
+
+nomtrr - disables write combining on frame buffer. This slows down driver
+ but there is reported minor incompatibility between GUS DMA and
+ XFree under high loads if write combining is enabled (sound
+ dropouts). MTRR is enabled by default on systems that have it
+ configured and that support it.
+
+cable:X - cable type. This can be any of the following: vga, rgb, and
+ composite. If none is specified, we guess.
+
+output:X - output type. This can be any of the following: pal, ntsc, and
+ vga. If none is specified, we guess.
+
+X11
+===
+
+XF86_FBDev should work, in theory. At the time of this writing it is
+totally untested and may or may not even portray the beginnings of
+working. If you end up testing this, please let me know!
+
+--
+Paul Mundt <lethal@linuxdc.org>
+