[Qemu-devel] [PATCH] Additional serial and parallel device

[Stefan Weil]

Hello,

well, the subject line is not exactly true: my patch does not
add a new device, but allows to disable a device.

"-serial none" disables the default serial device,
"-parallel none" disables the default parallel device.

It is also possible to skip a device:
"-serial none -serial vc" adds serial 1 without serial 0.

Many new PC platforms do not provide a serial device - now
QEMU can emulate these platforms better :-)

Regards
Stefan

Index: vl.c
===================================================================
RCS file: /sources/qemu/qemu/vl.c,v
retrieving revision 1.210
diff -u -b -B -r1.210 vl.c
--- vl.c        19 Aug 2006 12:37:52 -0000      1.210
+++ vl.c        1 Sep 2006 15:13:30 -0000
@@ -6844,27 +6844,29 @@
     monitor_init(monitor_hd, !nographic);
 
     for(i = 0; i < MAX_SERIAL_PORTS; i++) {
-        if (serial_devices[i][0] != '\0') {
-            serial_hds[i] = qemu_chr_open(serial_devices[i]);
+        const char *devname = serial_devices[i];
+        if (devname[0] != '\0' && strcmp(devname, "none")) {
+            serial_hds[i] = qemu_chr_open(devname);
             if (!serial_hds[i]) {
                 fprintf(stderr, "qemu: could not open serial device '%s'\n", 
-                        serial_devices[i]);
+                        devname);
                 exit(1);
             }
-            if (!strcmp(serial_devices[i], "vc"))
+            if (!strcmp(devname, "vc"))
                 qemu_chr_printf(serial_hds[i], "serial%d console\r\n", i);
         }
     }
 
     for(i = 0; i < MAX_PARALLEL_PORTS; i++) {
-        if (parallel_devices[i][0] != '\0') {
-            parallel_hds[i] = qemu_chr_open(parallel_devices[i]);
+        const char *devname = parallel_devices[i];
+        if (devname[0] != '\0' && strcmp(devname, "none")) {
+            parallel_hds[i] = qemu_chr_open(devname);
             if (!parallel_hds[i]) {
                 fprintf(stderr, "qemu: could not open parallel device '%s'\n", 
-                        parallel_devices[i]);
+                        devname);
                 exit(1);
             }
-            if (!strcmp(parallel_devices[i], "vc"))
+            if (!strcmp(devname, "vc"))
                 qemu_chr_printf(parallel_hds[i], "parallel%d console\r\n", i);
         }
     }
Index: qemu-doc.texi
===================================================================
RCS file: /sources/qemu/qemu/qemu-doc.texi,v
retrieving revision 1.107
diff -u -b -B -r1.107 qemu-doc.texi
--- qemu-doc.texi       21 Aug 2006 20:28:18 -0000      1.107
+++ qemu-doc.texi       1 Sep 2006 15:13:31 -0000
@@ -506,12 +506,16 @@
 This option can be used several times to simulate up to 4 serials
 ports.
 
+Use @code{-serial none} to disable all serial ports.
+
 Available character devices are:
 @table @code
 @item vc
 Virtual console
 @item pty
 [Linux only] Pseudo TTY (a new PTY is automatically allocated)
address@hidden none
+No device is allocated.
 @item null
 void device
 @item /dev/XXX
@@ -593,6 +597,8 @@
 This option can be used several times to simulate up to 3 parallel
 ports.
 
+Use @code{-parallel none} to disable all parallel ports.
+
 @item -monitor dev
 Redirect the monitor to host device @var{dev} (same devices as the
 serial port).