From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- Documentation/fb/pvr2fb.rst | 66 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 Documentation/fb/pvr2fb.rst (limited to 'Documentation/fb/pvr2fb.rst') diff --git a/Documentation/fb/pvr2fb.rst b/Documentation/fb/pvr2fb.rst new file mode 100644 index 0000000000..fcf2c21c8f --- /dev/null +++ b/Documentation/fb/pvr2fb.rst @@ -0,0 +1,66 @@ +=============== +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 (NOT on the Dreamcast) + * You can run XF86_FBDev on top of /dev/fb0 + * Most important: boot logo :-) + +Disadvantages: + + * Driver is largely untested on non-Dreamcast systems. + +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 with format [xres]x[yres]-@ + The following video modes are supported: + 640x640-16@60, 640x480-24@60, 640x480-32@60. The Dreamcast + defaults to 640x480-16@60. At the time of writing the + 24bpp and 32bpp modes function poorly. Work to fix that is + ongoing + + Note: the 640x240 mode is currently broken, and should not be + used for any reason. It is only mentioned here 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 has been shown to work on the Dreamcast in the past - though not yet +on any 2.6 series kernel. + +Paul Mundt + +Updated by Adrian McMenamin -- cgit v1.2.3