1.1 --- a/src/asic.c	Fri Dec 15 10:18:39 2006 +0000
     1.2 +++ b/src/asic.c	Tue Dec 19 11:54:47 2006 +0000
     1.3 @@ -1,5 +1,5 @@
     1.4  /**
     1.5 - * $Id: asic.c,v 1.20 2006-12-15 10:18:39 nkeynes Exp $
     1.6 + * $Id: asic.c,v 1.21 2006-12-19 09:51:35 nkeynes Exp $
     1.7   *
     1.8   * Support for the miscellaneous ASIC functions (Primarily event multiplexing,
     1.9   * and DMA). 
    1.10 @@ -213,6 +213,13 @@
    1.11  	MMIO_WRITE( ASIC, reg, MMIO_READ(ASIC, reg)&~val );
    1.12  	asic_check_cleared_events();
    1.13  	break;
    1.14 +    case SYSRESET:
    1.15 +	if( val == 0x7611 ) {
    1.16 +	    dreamcast_reset();
    1.17 +	} else {
    1.18 +	    WARN( "Unknown value %08X written to SYSRESET port", val );
    1.19 +	}
    1.20 +	break;
    1.21      case MAPLE_STATE:
    1.22  	MMIO_WRITE( ASIC, reg, val );
    1.23  	if( val & 1 ) {
    1.24 @@ -279,6 +286,10 @@
    1.25  
    1.26  MMIO_REGION_WRITE_FN( EXTDMA, reg, val )
    1.27  {
    1.28 +    if( !idereg.interface_enabled && IS_IDE_REGISTER(reg) ) {
    1.29 +	return; /* disabled */
    1.30 +    }
    1.31 +
    1.32      switch( reg ) {
    1.33      case IDEALTSTATUS: /* Device control */
    1.34  	ide_write_control( val );
    1.35 @@ -321,6 +332,15 @@
    1.36  	MMIO_WRITE( EXTDMA, reg, val );
    1.37  	asic_ide_dma_transfer( );
    1.38  	break;
    1.39 +    case IDEACTIVATE:
    1.40 +	if( val == 0x001FFFFF ) {
    1.41 +	    idereg.interface_enabled = TRUE;
    1.42 +	    /* Conventional wisdom says that this is necessary but not
    1.43 +	     * sufficient to enable the IDE interface.
    1.44 +	     */
    1.45 +	} else if( val == 0x000042FE ) {
    1.46 +	    idereg.interface_enabled = FALSE;
    1.47 +	}
    1.48      default:
    1.49              MMIO_WRITE( EXTDMA, reg, val );
    1.50      }
    1.51 @@ -329,6 +349,10 @@
    1.52  MMIO_REGION_READ_FN( EXTDMA, reg )
    1.53  {
    1.54      uint32_t val;
    1.55 +    if( !idereg.interface_enabled && IS_IDE_REGISTER(reg) ) {
    1.56 +	return 0xFFFFFFFF; /* disabled */
    1.57 +    }
    1.58 +
    1.59      switch( reg ) {
    1.60      case IDEALTSTATUS: 
    1.61  	val = idereg.status;