s3virge man page on BSDOS

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s3virge(4)					     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.

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
       example, "virge vx" and "VIRGEvx" are equivalent.

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

	   "virge",  "86c325",	"virge vx", "86c988", "virge dx",
	   "86c375", "virge gx", "86c385", "virge gx2", "86c357",

XFree86			Version 4.0.2				1

s3virge(4)					     s3virge(4)

	   "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.

       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.

       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

XFree86			Version 4.0.2				2

s3virge(4)					     s3virge(4)

	      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 accel-
	      eration 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: acceleration 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_conserva-
       tive"
	      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 bet-
	      ter  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_con-
	      servative 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 recom-
	      mended.  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
	      performance.  Default: off.

       Option "pci_retry" ["boolean"]
	      will allow the driver to rely on PCI Retry to  pro-
	      gram   the  ViRGE registers.   pci_burst	must  be

XFree86			Version 4.0.2				3

s3virge(4)					     s3virge(4)

	      enabled for this to work. This will increase  per-
	      formance, 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 chipsets.	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 dis-
	      play.  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.

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

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

XFree86			Version 4.0.2				4

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