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Diffstat (limited to 'kernel/Documentation/fb/pvr2fb.txt')
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diff --git a/kernel/Documentation/fb/pvr2fb.txt b/kernel/Documentation/fb/pvr2fb.txt new file mode 100644 index 000000000..36bdeff58 --- /dev/null +++ b/kernel/Documentation/fb/pvr2fb.txt @@ -0,0 +1,65 @@ +$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 (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]-<bpp>@<refresh rate> + 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 <lethal@linuxdc.org> +Updated by Adrian McMenamin <adrian@mcmen.demon.co.uk> + |