MirOS Manual: s3virge(4)


s3virge(4)          UNIX Programmer's Manual           s3virge(4)

NAME

     s3virge - S3 ViRGE video driver

SYNOPSIS

     Section "Device"
       Identifier "devname"
       Driver "s3virge"
       ...
       [ Option "optionname" ["optionvalue"]]
     EndSection

DESCRIPTION

     s3virge is an XFree86 driver for S3 based video cards.  The
     driver is fully accelerated, and provides support for the
     following framebuffer depths: 8, 15, 16, and 24.  All visual
     types are supported for depth 8, and TrueColor visuals are
     supported for the other depths.  XVideo hardware up scaling
     is supported in depth 16 and 24 on the DX, GX, GX2, MX, MX+,
     and Trio3D/2X.  Doublescan modes are supported and tested in
     depth 8 and 16 on DX, but disable XVideo.  Doublescan modes
     on other chipsets are untested.

SUPPORTED HARDWARE

     The s3virge driver supports PCI and AGP video cards based on
     the following S3 chips:

     ViRGE       86C325

     ViRGE VX    86C988

     ViRGE DX    86C375

     ViRGE GX    86C385

     ViRGE GX2   86C357

     ViRGE MX    86C260

     ViRGE MX+   86C280

     Trio 3D     86C365

     Trio 3D/2X  86C362, 86C368

CONFIGURATION DETAILS

     Please refer to XF86Config(5) for general configuration
     details.  This section only covers configuration details
     specific to this driver.  All options names are case and
     white space insensitive when parsed by the server, for exam-
     ple,  "virge vx" and "VIRGEvx" are equivalent.

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     The driver auto-detects the chipset type, but the following
     ChipSet names may optionally be specified in the config file
     "" ""Device"" section, and will override the auto-detection:

         "virge", "86c325", "virge vx", "86c988", "virge dx",
         "86c375", "virge gx", "86c385", "virge gx2", "86c357",
         "virge mx", "86c260", "virge mx+", "86c280", "trio 3d",
         "86c365", "trio 3d/2x", "86c362", "86c368".

     The following Cursor Options are supported:

     Option "HWCursor" ["boolean"]
          Enable or disable the HW cursor.  Default: on.

     Option "SWCursor" ["boolean"]
          Inverse of "HWCursor".  Default: off.

     The following display Options are supported:

     Option "ShadowFB" ["boolean"]
          Use shadow framebuffer.  Disables HW acceleration.
          Default: off.

     Option "Rotate" "cw | ccw"
          Rotate the screen CW - clockwise or CCW - counter
          clockwise. Disables HW Acceleration and HW Cursor, uses
          ShadowFB. Default: no rotation.

     Option "XVideo" ["boolean"]
          Disable XVideo support by using the off option.  This
          changes FIFO settings which prevent screen noise for
          high-res modes.  Default: on

     The following video memory Options are supported:

     Option "slow_edodram"
          Switch the standard ViRGE to 2-cycle edo mode. Try this
          if you encounter pixel corruption on the ViRGE. Using
          this option will cause a large decrease in performance.
          Default: off.

     Option "fpm_vram"
          Switch the ViRGE/VX to fast page mode vram mode.
          Default: off.

     Option "slow_dram | fast_dram"
          Change Trio 3D and 3D/2X memory options.  Default: Use
          BIOS defaults.

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     Option "early_ras_precharge | late_ras_precharge"
          adjust memory parameters.  One of these will us the
          same settings as your video card defaults, and using
          neither in the config file does the same.  Default:
          none.

     Option "set_mclk" "integer"
          sets the memory clock, where integer is in kHz, and
          integer <= 100000.  Default: probe the memory clock
          value, and use it at server start.

     Option "set_refclk" "integer"
          sets the ref clock for ViRGE MX, where integer is in
          kHz.  Default: probe the memory clock value, and use it
          at server start.

     The following acceleration and graphics engine Options are
     supported:

     Option "NoAccel"
          Disable acceleration.  Very useful for determining if
          the driver has problems with drawing and acceleration
          routines.  This is the first option to try if your
          server runs but you see graphic corruption on the
          screen. Using it decreases performance, as it uses
          software emulation for drawing operations the video
          driver can accelerate with hardware. Default: accelera-
          tion is enabled.

     Option "UseFB"
          There are two framebuffer rendering methods.  fb and
          cfb.  Both are available in the driver.  fb is the
          newer and default method.  To switch back to cfb use
          this option with no, off or other negative parameter.
          Default: on.

     Option "fifo_aggressive | fifo_moderate | fifo_conservative"
          alter the settings for the threshold at which the pixel
          FIFO takes over the internal memory bus to refill
          itself. The smaller this threshold, the better the
          acceleration performance of the card. You may try the
          fastest setting (fifo_aggressive) and move down if you
          encounter pixel corruption. The optimal setting will
          probably depend on dot-clock and on color depth. Note
          that specifying any of these options will also alter
          other memory settings which may increase performance,
          so trying fifo_conservative will in most cases be a
          slight benefit (this uses the chip defaults). If pixel
          corruption or transient streaking is observed during
          drawing operations then removing any fifo options is

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s3virge(4)          UNIX Programmer's Manual           s3virge(4)

          recommended.  Default: none.

     The following PCI bus Options are supported:

     Option "pci_burst" ["boolean"]
          will enable PCI burst mode. This should work on all but
          a few broken PCI chipsets, and will increase perfor-
          mance.  Default: off.

     Option "pci_retry" ["boolean"]
          will allow the driver to rely on PCI Retry to program
          the ViRGE registers. pci_burst must be enabled for this
          to work. This will increase performance, especially for
          small fills/blits, because the driver does not have to
          poll the ViRGE before sending it commands to make sure
          it is ready. It should work on most recent PCI chip-
          sets.  Default: off.

     The following ViRGE MX LCD Options are supported:

     Option "lcd_center"

     Option "set_lcdclk" "integer"
          allows setting the clock for a ViRGE MX LCD display.
          integer is in Hz.  Default: use probed value.

     The following additional Options are supported:

     Option "ShowCache" ["boolean"]
          Enable or disable viewing offscreen cache memory.  A
          development debug option.  Default: off.

     Option "mx_cr3a_fix" ["boolean"]
          Enable or disable a cr3a fix added for ViRGE MX.
          Default: on.

SEE ALSO

     XFree86(1), XF86Config(5), xf86config(1), Xserver(1), X(7)

KNOWN BUGS

     The VideoRam generic driver parameter is presently ignored
     by the s3virge driver.  On PPC this is reported to cause
     problems for 2M cards, because they may autodetect as 4M.

SUPPORT

     For assistance with this driver, or XFree86 in general,
     check the XFree86 web site at http://www.xfree86.org.  A FAQ

XFree86                   Version 4.5.0                         4

s3virge(4)          UNIX Programmer's Manual           s3virge(4)

     is available on the web site at http://www.xfree86.org/FAQ/.
     If you find a problem with XFree86 or have a question not
     answered in the FAQ please use our bug report form available
     on the web site or send mail to XFree86@XFree86.org.  When
     reporting problems with the driver send as much detail as
     possible, including chipset type, a server output log, and
     operating system specifics.

AUTHORS

     Kevin Brosius, Matt Grossman, Harald Koenig, Sebastien Mar-
     ineau, Mark Vojkovich.

XFree86                   Version 4.5.0                         5

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