*RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_VCLKSTRTSTOP     = (ulVLinesTotal<<RASTER_START_SHIFT) | (ulVLinesTotal<<RASTER_STOP_SHIFT);

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_HCLKSTOTAL       = ulHClocksTotal;

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_HSYNCSTRTSTOP    = (ulHSyncStart<<RASTER_START_SHIFT) | (ulHSyncStop<<RASTER_STOP_SHIFT);

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_HBLANKSTRTSTOP   = (ulHBlankStart<<RASTER_START_SHIFT) | (ulHBlankStop<<RASTER_STOP_SHIFT);

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_HACTIVESTRTSTOP  = (pStartStop->ulHActiveStart<<RASTER_START_SHIFT) | 
                               (pStartStop->ulHActiveStop<<RASTER_STOP_SHIFT);

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_HCLKSTRTSTOP     = (ulHClocksTotal<<RASTER_START_SHIFT) | (ulHClocksTotal<<RASTER_STOP_SHIFT);

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_LINECARRY        = 0x00;

    *RASTER_SCRNLINES        = ulHeight -1 ;
    *RASTER_LINELENGTH       = (ulWidth * ulColorDepth) / 32 -1;
    *RASTER_VLINESTEP        = (ulWidth * ulColorDepth) / 32;
    *RASTER_VIDSCRNPAGE      = ulPhysicalFramePointer & VIDSCRNPAGE_MASK;
    

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_VIDEOATTRIBS     = VIDEOATTRIBS_INVCLK | VIDEOATTRIBS_DATEN | VIDEOATTRIBS_SYNCEN |
                               VIDEOATTRIBS_PCLKEN | VIDEOATTRIBS_EN | VIDEOATTRIBS_SDSEL_CS3;

}



//****************************************************************************
// GenericDisplaySetup
//****************************************************************************
// Uses the registry settings to setup the display.
// 
//
void GenericDisplaySetup
(
    Ep931xRegistrySettings  *pRegSetting,
    ULONG                   ulPhysicalFramePointer,
    StartStop               *pStartStop
)
{   
    ULONG ulRequestedVideoFreq;
    ULONG ulVidDiv, ulVid1Div, ulVid2Div;
    ULONG ulVid1Freq, ulVid2Freq;
    ULONG ulTemp;
    ULONG ulDevCfg;

    //
    // If we are using a Conexant CX25871 video encoder perform the
    // following setup.
    //
    if(pRegSetting->fUseCX25871)
    {
        InitializeCX25871For640x480NTSC();
    }

    //
    // Read in the device configuration register.
    //
    ulDevCfg                = *CSC_DEVCFG;

    //
    // If we are using an external video clock then don't worry about calculating
    // a video divisor.
    //
    if(pRegSetting->fExtVideoClock)
    {
        ulDevCfg   |= DEVCFG_EXVC;
        ulVidDiv   = 0; 
    }
    else
    {
        //
        // Calculate the proper video clock based on the refresh rate, number of lines
        // and pixels per line.
        //
        ulRequestedVideoFreq = ( pRegSetting->ulFrequency * pRegSetting->ulHClocksTotal * 
                                 pRegSetting->ulVLinesTotal);

        CalculateClosestFreq
        (
            PLL1_CLOCK, 
            ulRequestedVideoFreq,
            &ulVid1Freq,
            &ulVid1Div
        );
        CalculateClosestFreq
        (
            PLL2_CLOCK, 
            ulRequestedVideoFreq,
            &ulVid2Freq,
            &ulVid2Div
        );

        //
        // See which is closer, Video rate 1 or video rate 2.
        //
        if(abs(ulVid1Freq - ulRequestedVideoFreq) <abs(ulVid2Freq - ulRequestedVideoFreq))
        {
            ulVidDiv =ulVid1Div;
        }
        else
        {
            ulVidDiv =ulVid2Div | VIDDIV_PSEL;
        }
        ulVidDiv |= VIDDIV_ESEL;
    }

    //
    // Change to Raster on P3, set/clear the EXVC bit and clear RAS.
    //
    HalWriteCommonReg
    (
        CSC_DEVCFG, 
        DEVCFG_EXVC | DEVCFG_RAS | DEVCFG_RASONP3, 
        ulDevCfg | DEVCFG_RASONP3
    );

    //
    // Set the proper video divsor value.
    //
    HalWriteCommonReg(CSC_VIDDIV, 0xFFFFFFFF, VIDDIV_VENA | ulVidDiv);

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_VLINESTOTAL      = pRegSetting->ulVLinesTotal;

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_VSYNCSTRTSTOP    = pRegSetting->ulVSyncStartStop;

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_VBLANKSTRTSTOP   = pRegSetting->ulVBlankStartStop;

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_VACTIVESTRTSTOP  = pRegSetting->ulVActiveStartStop;

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_VCLKSTRTSTOP     = pRegSetting->ulVClockStartStop;

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_HCLKSTOTAL       = pRegSetting->ulHClocksTotal;

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_HSYNCSTRTSTOP    = pRegSetting->ulHSyncStartStop;

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_HBLANKSTRTSTOP   = pRegSetting->ulHBlankStartStop;

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_HACTIVESTRTSTOP  = pRegSetting->ulHActiveStartStop;

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_HCLKSTRTSTOP     = pRegSetting->ulHClockStartStop;


    //
    // Calculate the active start stop values from the raster settings.
    //
    pStartStop->ulVActiveStop = (pRegSetting->ulVActiveStartStop & RASTER_STOP_MASK) >> RASTER_STOP_SHIFT;
    pStartStop->ulVActiveStart= (pRegSetting->ulVActiveStartStop & RASTER_START_MASK) >> RASTER_START_SHIFT;
    pStartStop->ulHActiveStop = (pRegSetting->ulHActiveStartStop & RASTER_STOP_MASK) >> RASTER_STOP_SHIFT;
    pStartStop->ulHActiveStart= (pRegSetting->ulHActiveStartStop & RASTER_START_MASK) >> RASTER_START_SHIFT;

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_LINECARRY        = 0x00;


    //*RASTER_SCRNLINES        = pRegSetting->ulScreenHeight ;
    *RASTER_SCRNLINES        = pRegSetting->ulScreenHeight - 1;
    *RASTER_LINELENGTH       = (pRegSetting->ulScreenWidth * pRegSetting->ulColorDepth) / 32 -1;
    *RASTER_VLINESTEP        = (pRegSetting->ulScreenWidth * pRegSetting->ulColorDepth) / 32;
    *RASTER_VIDSCRNPAGE      = ulPhysicalFramePointer & VIDSCRNPAGE_MASK;
    

    *RASTER_REALITI_SWLOCK   = 0xaa;
    *RASTER_VIDEOATTRIBS     = VIDEOATTRIBS_DATEN | VIDEOATTRIBS_SYNCEN |
                               VIDEOATTRIBS_EN | VIDEOATTRIBS_SDSEL_CS3 |
                               ((!pRegSetting->fExtVideoClock)?VIDEOATTRIBS_PCLKEN: 0) |
                               (pRegSetting->fInvertPixelClock? VIDEOATTRIBS_INVCLK: 0);

    //
    // Set the GPIO pin so that the screen wakes up.
    //
    if(pRegSetting->fSleepSignalActive)
    {
        ulTemp = *GPIO_PADDR;
        *GPIO_PADDR = ulTemp | 0x2;

        ulTemp = *GPIO_PADR;
        *GPIO_PADR = ulTemp | 0x2;
    }

}

//****************************************************************************
// ReadRegistryValue
//****************************************************************************
// Read the Registry Value
// 
//
DWORD ReadRegistryValue(HKEY hKey, PTSTR szValueName, DWORD dwDefault)
{
    LONG    lStatus;
    ULONG   ulReturnValue;
    DWORD   dwValType;
    DWORD   dwValLen;

    lStatus = RegQueryValueEx( hKey, szValueName, NULL, &dwValType, (PBYTE)&ulReturnValue, &dwValLen);
        
    if ((lStatus != ERROR_SUCCESS) || (dwValType != REG_DWORD)) 
    {           
        ulReturnValue = dwDefault;
    } 
 
    return ulReturnValue;
}



//****************************************************************************
// GetDisplayRegistrySettings
//****************************************************************************
// Gets the display settings from the registry.
//
// See the platform.reg for example registry settings.
// 
//
void GetDisplayRegistrySettings
(
    Ep931xRegistrySettings *pRegSetting
)
{
    HKEY    hKey;

    //
    // remove our registry entry "claiming" this particular card
    //
    if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, DRIVER_REGISTRY_STRING, 0, 0, &hKey) != ERROR_SUCCESS)
    {
        return;
    }
  
    //
    // Get the values from the registry.
    //
    pRegSetting->ulScreenWidth      = ReadRegistryValue(hKey, REG_VALUE_SCREENWIDTH      , 640  );
    pRegSetting->ulScreenHeight     = ReadRegistryValue(hKey, REG_VALUE_SCREENHEIGHT     , 480  );
    pRegSetting->ulFrequency        = ReadRegistryValue(hKey, REG_VALUE_FREQUENCY        , 60   );
    pRegSetting->ulColorDepth       = ReadRegistryValue(hKey, REG_VALUE_COLORDEPTH       , 16   );
    pRegSetting->ulSetDirectly      = ReadRegistryValue(hKey, REG_VALUE_SETDIRECTLY      , 0    );
    pRegSetting->ulVLinesTotal      = ReadRegistryValue(hKey, REG_VALUE_VLINESTOTAL      , -1   );
    pRegSetting->ulVSyncStartStop   = ReadRegistryValue(hKey, REG_VALUE_VSYNCSTARTSTOP   , -1   );
    pRegSetting->ulVActiveStartStop = ReadRegistryValue(hKey, REG_VALUE_VACTIVESTARTSTOP , -1   );
    pRegSetting->ulVBlankStartStop  = ReadRegistryValue(hKey, REG_VALUE_VBLANKSTARTSTOP  , 0    );
    pRegSetting->ulVClockStartStop  = ReadRegistryValue(hKey, REG_VALUE_VCLOCKSTARTSTOP  , -1   );
    pRegSetting->ulHClocksTotal     = ReadRegistryValue(hKey, REG_VALUE_HCLOCKSTOTAL     , -1   );
    pRegSetting->ulHSyncStartStop   = ReadRegistryValue(hKey, REG_VALUE_HSYNCSTARTSTOP   , -1   );
    pRegSetting->ulHActiveStartStop = ReadRegistryValue(hKey, REG_VALUE_HACTIVESTARTSTOP , -1   );
    pRegSetting->ulHBlankStartStop  = ReadRegistryValue(hKey, REG_VALUE_HBLANKSTARTSTOP  , 0    );
    pRegSetting->ulHClockStartStop  = ReadRegistryValue(hKey, REG_VALUE_HCLOCKSTARTSTOP  , -1   );
    pRegSetting->fInvertPixelClock  = ReadRegistryValue(hKey, REG_VALUE_INVERTPIXELCLOCK ,  1   );
    pRegSetting->fSleepSignalActive = ReadRegistryValue(hKey, REG_VALUE_SLEEPSIGNALACTIVE,  0   );
    pRegSetting->fUseCX25871        = ReadRegistryValue(hKey, REG_VALUE_USECX25871       ,  0   );
    pRegSetting->fExtVideoClock     = ReadRegistryValue(hKey, REG_VALUE_EXT_VIDEO_CLOCK  ,  0   );

    
    //
    // Check to make sure that all of the important registry settings are there.
    //
    if( pRegSetting->ulVLinesTotal       == -1 ||  
        pRegSetting->ulVSyncStartStop    == -1 ||
        pRegSetting->ulVActiveStartStop  == -1 ||
        // pRegSetting->ulVBlankStartStop   == -1 ||
        pRegSetting->ulVClockStartStop   == -1 ||
        pRegSetting->ulHClocksTotal      == -1 ||
        pRegSetting->ulHSyncStartStop    == -1 ||
        pRegSetting->ulHActiveStartStop  == -1 ||
        // pRegSetting->ulHBlankStartStop   == -1 ||
        pRegSetting->ulHClockStartStop   == -1)
    {
        pRegSetting->ulSetDirectly = 0;    
    }

    RegCloseKey( hKey);
}