mirror of https://gitee.com/openkylin/linux.git
67 lines
2.2 KiB
ReStructuredText
67 lines
2.2 KiB
ReStructuredText
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===============
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What is pvr2fb?
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===============
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This is a driver for PowerVR 2 based graphics frame buffers, such as the
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one found in the Dreamcast.
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Advantages:
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* It provides a nice large console (128 cols + 48 lines with 1024x768)
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without using tiny, unreadable fonts (NOT on the Dreamcast)
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* You can run XF86_FBDev on top of /dev/fb0
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* Most important: boot logo :-)
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Disadvantages:
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* Driver is largely untested on non-Dreamcast systems.
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Configuration
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=============
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You can pass kernel command line options to pvr2fb with
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`video=pvr2fb:option1,option2:value2,option3` (multiple options should be
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separated by comma, values are separated from options by `:`).
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Accepted options:
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========== ==================================================================
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font:X default font to use. All fonts are supported, including the
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SUN12x22 font which is very nice at high resolutions.
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mode:X default video mode with format [xres]x[yres]-<bpp>@<refresh rate>
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The following video modes are supported:
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640x640-16@60, 640x480-24@60, 640x480-32@60. The Dreamcast
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defaults to 640x480-16@60. At the time of writing the
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24bpp and 32bpp modes function poorly. Work to fix that is
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ongoing
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Note: the 640x240 mode is currently broken, and should not be
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used for any reason. It is only mentioned here as a reference.
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inverse invert colors on screen (for LCD displays)
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nomtrr disables write combining on frame buffer. This slows down driver
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but there is reported minor incompatibility between GUS DMA and
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XFree under high loads if write combining is enabled (sound
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dropouts). MTRR is enabled by default on systems that have it
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configured and that support it.
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cable:X cable type. This can be any of the following: vga, rgb, and
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composite. If none is specified, we guess.
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output:X output type. This can be any of the following: pal, ntsc, and
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vga. If none is specified, we guess.
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========== ==================================================================
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X11
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===
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XF86_FBDev has been shown to work on the Dreamcast in the past - though not yet
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on any 2.6 series kernel.
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Paul Mundt <lethal@linuxdc.org>
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Updated by Adrian McMenamin <adrian@mcmen.demon.co.uk>
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