123 lines
3.4 KiB
Plaintext
123 lines
3.4 KiB
Plaintext
<!DOCTYPE linuxdoc PUBLIC "-//Xorg//DTD linuxdoc//EN" [
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<!ENTITY % defs SYSTEM "defs.ent"> %defs;
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]>
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<article>
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<title> Information for Alliance Promotion chipset users
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<author> Loïc Grenié (<email>grenie@math.jussieu.fr</email>),
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Henrik Harmsen (<email>Henrik.Harmsen@erv.ericsson.se</email>)
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<date> 6 March 2000
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<ident>
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$Id: README.sgml,v 1.1.1.1 2006/11/26 19:58:56 matthieu Exp $
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</ident>
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<toc>
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<sect> Support chipsets
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<p>
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The apm driver in the SVGA server is for Alliance Promotion
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graphics chipsets. The following chipsets are supported:
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<itemize>
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<item> 6422
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Old chipset. The driver is still very unstable and has computer
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crashes. You should use XFree86 3.3.x for this chipset.
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<item> AT24
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As found in Diamond Stealth Video 2500. Quite similar to AT3D.
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<item> AT25, AT3D
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AT3D is found in Hercules Stingray 128/3D. Most other Voodoo
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Rush based cards use the AT25 which is identical except it
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doesn't have the 3D stuff in it.
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</itemize>
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<sect> Acceleration
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<p>
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The apm driver uses the XAA in the
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SVGA server. It has support for the following acceleration:
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<itemize>
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<item> Bitblts (rectangle copy operation)
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<item> Lines (solid, single pixel)
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<item> Filled rectangles
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<item> CPU->Screen image transfers.
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<item> CPU->Screen colour expansion (text accel).
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<item> Screen->Screen colour expansion (cached text accel).
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<item> Mono 8x8 pattern fill. Not for 6422.
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<item> Colour 8x8 pattern fill (in 8bpp). Not for 6422.
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<item> Hardware cursor.
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<item> Pixmap caching.
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</itemize>
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All in 8, 16 and 32 bpp modes. In 24bpp mode only Bitblts and Filled rectangles
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is supported. Also VESA DPMS power save mode is fully supported with "standby",
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"suspend" and "off" modes (set with with the "xset dpms" command).
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<sect> DGA
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<p>
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Full DGA 2.0 support with framebuffer access and drawing acceleration.
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<sect> Video
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<p>
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It has limited hardware support for video decoding on the AT24 and AT25/3D. It can
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also display an image in YUV colours inside the desktop. There are some more exotic
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formats such as YUV 4.1.1, YUV 4.0.0 and RGB 8,16.32bpp.
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<sect> Shadow framebuffer
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<p>
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There is a mode, called shadow framebuffer, where the graphics are used
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to display the images. All rendering is done in memory in a so-called shadow
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framebuffer. This mode is useful if you need lots of reading in the video
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memory and to use it you will have to put
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<verb>
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Option "ShadowFB"
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</verb>
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in your xorg.conf file.
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<sect> Configuration
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<p>
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First: Run the xorgconfig program to create a correct
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configuration.
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You can turn off hardware cursor by inserting the following line in the
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Device section of the xorg.conf file:
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<verb>
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Option "SWcursor"
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</verb>
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Or turn off hardware acceleration:
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<verb>
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Option "noaccel"
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</verb>
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Or turn off MMIO
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<verb>
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Option "nolinear"
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</verb>
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Do not specify either the amount of video RAM or which chipset
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in the config file. It is better to let the driver probe for this. Also
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don't put any "clocks" line in the device section since these chips have
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a fully programmable clock that can almost take any modeline you throw
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at it. It might though fail at some specific clock values but in that case
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you should just try a slightly different clock and it should work.
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<sect> glide2x
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<p>
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There is support for the XF86Rush extension for use with the glide2x library.
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<sect> Questions
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<p>
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Any questions regarding this driver should be sent to Loïc
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Grenié. It should be possible to add support for the 3210 chipset
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if someone needs it.
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</article>
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