diff -r afabaa39be52 tools/ioemu/hw/pc.c
--- a/tools/ioemu/hw/pc.c	Wed May 31 07:20:36 2006 +0100
+++ b/tools/ioemu/hw/pc.c	Wed May 31 09:47:08 2006 -0400
@@ -537,8 +537,11 @@ void pc_init(uint64_t ram_size, int vga_
     for(i = 0; i < MAX_SERIAL_PORTS; i++) {
         if (serial_hds[i]) {
             sp = serial_init(serial_io[i], serial_irq[i], serial_hds[i]);
-            if (i == SUMMA_PORT)
+            if (i == serial_summa_port) {
 		summa_init(sp, serial_hds[i]);
+		fprintf(stderr, "Serial port %d (COM%d) initialized for Summagraphics\n",
+			i, i+1);
+	    }
         }
     }
 
diff -r afabaa39be52 tools/ioemu/vl.c
--- a/tools/ioemu/vl.c	Wed May 31 07:20:36 2006 +0100
+++ b/tools/ioemu/vl.c	Wed May 31 09:47:08 2006 -0400
@@ -146,6 +146,7 @@ int repeat_key = 1;
 int repeat_key = 1;
 TextConsole *vga_console;
 CharDriverState *serial_hds[MAX_SERIAL_PORTS];
+int serial_summa_port = -1;
 int xc_handle;
 time_t timeoffset = 0;
 
@@ -2588,8 +2589,8 @@ int main(int argc, char **argv)
     pstrcpy(monitor_device, sizeof(monitor_device), "vc");
 
     pstrcpy(serial_devices[0], sizeof(serial_devices[0]), "vc");
-    pstrcpy(serial_devices[1], sizeof(serial_devices[1]), "null");
-    for(i = 2; i < MAX_SERIAL_PORTS; i++)
+    serial_summa_port = -1;
+    for(i = 1; i < MAX_SERIAL_PORTS; i++)
         serial_devices[i][0] = '\0';
     serial_device_index = 0;
 
@@ -3173,6 +3174,20 @@ int main(int argc, char **argv)
     }
     monitor_init(monitor_hd, !nographic);
 
+    /* Find which port should be the Summagraphics port */
+    /* It's the first unspecified serial line. Note that COM1 is set */
+    /* by default, so the Summagraphics port would be COM2 or higher */
+
+    for(i = 0; i < MAX_SERIAL_PORTS; i++) {
+      if (serial_devices[i][0] != '\0')
+	continue;
+      serial_summa_port = i;
+      pstrcpy(serial_devices[serial_summa_port], sizeof(serial_devices[0]), "null");
+      break;
+    }
+
+    /* Now, open the ports */
+
     for(i = 0; i < MAX_SERIAL_PORTS; i++) {
         if (serial_devices[i][0] != '\0') {
             serial_hds[i] = qemu_chr_open(serial_devices[i]);
diff -r afabaa39be52 tools/ioemu/vl.h
--- a/tools/ioemu/vl.h	Wed May 31 07:20:36 2006 +0100
+++ b/tools/ioemu/vl.h	Wed May 31 09:47:08 2006 -0400
@@ -238,9 +238,9 @@ void console_select(unsigned int index);
 /* serial ports */
 
 #define MAX_SERIAL_PORTS 4
-#define SUMMA_PORT	1
 
 extern CharDriverState *serial_hds[MAX_SERIAL_PORTS];
+extern int serial_summa_port;
 
 /* network redirectors support */