boot argument support.

* SMI_VGXDMA: Turn this flag to 1, Voyager GX DMA API will be available to use by 
  applications. Utility vgxdma is a sample code to use the DMA API.

Registry Settings
-----------------
Registry Settings determine the mode sets by the driver when it first loads up
(See Setup section on how to specify them). 

* The default registry format is as follows:

[HKEY_LOCAL_MACHINE\Drivers\Display\SMIVGX]
; For Screen Size, Panel Size, and Bpp
  "CxPanel"		=	dword:{any value in hex, as supported by driver}
  "CyPanel"		=	dword:{any value in hex, as supported by driver}
  "CxScreen"	=	dword:{any value in hex, as supported by driver}
  "CyScreen"	=	dword:{any value in hex, as supported by driver}
  "CxZoom"		=	dword:{any value in hex, as supported by driver}
  "CyZoom"		=	dword:{any value in hex, as supported by driver}
  "CursorZoom"	=	dword:{0, 1}
  "Bpp"	  		=	dword:{8, 10, 20}
  "RefreshRate"	=	dword:{any value in hex, as supported by driver}
  "TestClock"	=	dword:{any value in hex, as installed on the VGX board}
  "DisplayType" =   dword:{1 = panel, 2 = CRT, 3 = panel + CRT}
  "SaveRestore" =   dword:{0, 1}
  "SaveSurface" =   dword:{0, 1}
  "PowerMonitor" =  dword:{0, 1}
  "OverlayDisabled" = dword:{0,1} 
  "CSCDisabled" = dword:{0,1}
  "CrystalFrequency" = dword:{18,C}
  "VideoInterpolation" = dword:{0=no interpolation, 1=Horizontal, 2=Vertical, 3=Horizontal & Vertical (default)}
  "FixedColorKey" = dword:{0, 1}
  "WaitVsync" = dword:{0=do not wait for Vsync (default) when flip graphic surface, 1=wait for Vsync}
  "SetPowerCEPC" = dword:{0, 1}
  "MemorySize"	=   dword:{8,10,20}
  "BacklightEnable" =   dword:1    ; 1 - enable, 0 - disable backlight
  "BacklightTimer" =    dword:A    ;backlightTimer timeout in second.
  "SWLine"	=     dword:1      ;1 -enable software to draw line for CETK test.

; For Host-based driver
  "FB_BASE" 	= dword:{base physical address in hex}
  "FG_BASE" 	= dword:{register physical address in hex}

;Hitachi PFM_DS8P
  "FB_BASE"		= dword:10000000
  "FG_BASE"		= dword:13E00000

;ACCELENT IDP_PXA250_NET
  "FB_BASE"		= dword:08000000
  "FG_BASE"		= dword:0BE00000

;STELLCOM Peacock
  "FB_BASE"		= dword:10000000
  "FG_BASE"		= dword:13E00000

; For DMA API on STELLCOM Peacock, should be same as in config.bib file. 
;   VGXDMA    84040000  000E0000  RESERVED	; in config.bib
  "SDRAM_BASE"      = dword:84000000
  "VGXDMABUF_ADDR"  = dword:84040000 
  "VGXDMABUF_SIZE"  = dword:E0000

; For enabling Gamma correction function
  "Gamma" 		=   dword:{0, 1}

; For SMI Special Modes and Panel Types
  "PanelType" = dword:{as specified below}
; For Hitachi Mono STN 320x240 panel - SP14Q003
  "PanelType" = dword:100
; For special timings of 800x600 TFT panel requested by Plexus
  "PanelType" = dword:200

; For special panel settings by modifying hardware register directly
; See definition below for detail explanation.
  "PanelSettings" = hex:xx0,xx0,xx0,xx0, xx1,xx1,xx1,xx1,....

; For Rotation Feature
  "Angle"		=	dword:{0,5A,B4,10E}

; For Multimon support
[HKEY_LOCAL_MACHINE\SYSTEM\GDI\MONITORS]
  "TOTAL MONITORS" = dword:{number of monitors} 

; NOTE: Bpp option has to be the same across all monitors (WinCE limitation)
[HKEY_LOCAL_MACHINE\Drivers\Display\SMIVGX\MONITOR0]
; Specify Panel settings and refresh rate for first monitor, as necessary

[HKEY_LOCAL_MACHINE\Drivers\Display\SMIVGX\MONITOR1]
; Specify Panel settings and refresh rate for second monitor, as necessary

[HKEY_LOCAL_MACHINE\Drivers\Display\SMIVGX\MONITOR2]
; Specify Panel settings and refresh rate for third monitor, as necessary

[HKEY_LOCAL_MACHINE\Drivers\Display\SMIVGX\MONITOR3]
; Specify Panel settings and refresh rate for fourth monitor, as necessary



* The definitions are:
  - CxPanel, CyPanel: Panel width and height.
  		If not specified, CxPanel and CyPanel will be defaulted to 800x600 

  - CxScreen, CyScreen: Screen width and height (Display mode resolution).
		If not specified, CxScreen and CyScreen will be the same as on 
		CxPanel and CyPanel.
	NOTE1: The difference between Panel and Screen is that CxPanel and CyPanel
	    determine the physical dimension of the panel while CxScreen and 
		CyScreen determine the dimension of the screen desktop.
	NOTE2: CxScreen & CyScreen less than CxPanel & CyPanel, zoom feature will be enabled.
		When Zoom feature is enabled, Overlay Capability will be disabled.
	NOTE3: Panning is NOT supported for the second monitor in the DualMon feature.

  - CxZoom, CyZoom: Zoom width and height.
  		If not specified, CxZoom and CyZoom will be disabled. 
  
  - CursorZoom: Enable or Disable Cursor Zooming in Zoom-In/Zoom-Out mode.
		If not specified, CursorZooom will be disabled.

  - Bpp: Number of bits of colors for one pixel.  
 	    If not specified, Bpp is defaulted to 16-bpp mode.

  - RefreshRate: Refresh rate / vertical frequency of monitors/panels.
 	    If not specified, RefreshRate is defaulted to 60 Hz.

  - TestClock: The frequency of the test clock installed and used on the board.
		Do NOT set this setting if internal clock is used!
		This registry ONLY for SPECIAL cases only!
		If not specified, TestClock is defaulted to 133Mhz for rev. A chips.

  - DisplayType: 1 - Enable panel output only
                 2 - Enable CRT output only
                 3 - Enable both panel & CRT outputs

  - SaveRestore: 0 - The driver will not save/restore VGX registers and memory
                     to/from system memory
                 1 - Otherwise

  - SaveSurface: Valid only if 'SaveRestore' registry key is 1
                 0 - The driver will not save/restore all surfaces to/from system memory
                 1 - Otherwise

  - PowerMonitor: The driver monitors AC/DC change and 2D activity to determine if 
  				  voltage and/or clock frequencies need to be reduced or not.  Please 
  				  refer to SMI power management spec for details.
  				  0 - ReduceOn disable
				  1 - ReduceOn enable

  - VgxSysIntr: Determines the SYSINTR value to use for Voyager interrupt handling.
                If the varibale is not specified, the driver will attempt to get the value from OS.

  - OverlayDisabled: Enable or disable the back-end Overlay video feature in the driver.
				If not specified, Overlay video feature will be enabled.
				If 1, Overlay video feature will be disabled.

  - CSCDisabled: Enable or disable the front-end Color Space Conversion feature in the driver.
				If not specified, CSC feature will be enabled.
				If 1, CSC feature will be disabled.

  - CrystalFrequency: 18 (24MHz, SM501 default setting) or C (12MHz).

  - VideoInterpolation:0=no interpolation, 1=Horizontal, 2=Vertical, 3=Horizontal & Vertical (default)

  - FixedColorKey: 0=Use DirectDraw passed colorkey , 1=Use fixed colorkey (0x0841) to do video overlay

  - WaitVsync: 0=do not wait for Vsync (default) when flip graphic surface, 1=wait for Vsync
  
  - SetPowerCEPC: 0=Set power mode for non-X86 systems(default), 1=for X86 compatible systems

  - FB_BASE:  For Host-based driver only!
        Specify the physical address of the VGX frame buffer.

  - FG_BASE:  For Host-based driver only!
        Specify the physical address of the VGX register MMIO.

  - PanelType: For special panel type. Certain number corresponds to certain panel type, 
        as listed below (all values are hex values):
		100 = For Hitachi Mono STN 320x240 panel - SP14Q003
		200 = For special timings of 800x600 TFT panel requested by Plexus
		400 = For modified timings of 1024x768 panel

  - PanelSettings: For special panel settings. Allow direct hardware accesses using this feature.
        "PanelSettings" = hex:aa,bb,cc,dd, ee,ff,gg,hh, ii,jj,kk,ll....
		All entries are treated as DWORD values, so for the example above - in little endian:
		Mask = ddccbbaa
		Values = hhggffee, llkkjjii, ....
		
		Options in the mask are:
		PANEL_HORIZONTAL_TOTAL		0x00000001
		PANEL_HORIZONTAL_SYNC		0x00000002
		PANEL_VERTICAL_TOTAL		0x00000004
		PANEL_VERTICAL_SYNC			0x00000008
		POWER_MODE_CLOCK			0x00000010
		PANEL_DISPLAY_CTRL			0x00000020

        eg. "PanelSettings"=hex:0a,00,00,00,7f,03,d4,00,58,02,18,00
		Mask = 0x0000000a
		Values = 0x00d4037f, 0x00180258 (based on mask bit from LSB to MSB)
		so register PANEL_HORIZONTAL_SYNC = 0x00d4037f, PANEL_VERTICAL_SYNC = 0x00180258

  - Angle: Angle of rotation 0(0), 90(0x5A), 180(0xB4), and 270(0x10E),
  		only if Rotation feature is enabled.
		If not specified, Angle is defaulted to 0.
  - MemorySize: Memory size is 8M(0x8), 16M(0x10) or 32M(0x20).

  - MemoryClock:same below
  - EngineClock: select the clock.
		 0 - 336MHZ, 1 - 288MHZ, 2 - 168MHZ, 3 - 144MHZ, 4 - 112MHZ, 5 - 96MHZ 
		 6 - 84MHZ,  7 - 72MHZ,  8 - 56MHZ,  9 - 48MHZ,  A - 42MHZ,  B - 36MHZ
		 C - 28MHZ,  D - 24MHZ,  E - 21MHZ,  F - 18MHZ,  10- 14MHZ,  11- 7MHZ
		 12- 6MHZ,   13-3MHZ 


.






Troubleshooting
---------------
Note: Due to internal clock issue on rev.A chips, certain settings
      (resolutions & refresh rate) may not work and may hang the system.