Hi,

the attached patch adds host serial port support on linux hosts.
To enable it use the following commands:

VBoxManage setextradata "YourVM"
   "VBoxInternal/Devices/serial/0/Config/IRQ" 4
VBoxManage setextradata "YourVM"
   "VBoxInternal/Devices/serial/0/Config/IOBase" 0x3f8
VBoxManage setextradata "YourVM"
   "VBoxInternal/Devices/serial/0/LUN#0/Driver" "Host Serial"
VBoxManage setextradata "YourVM"
   "VBoxInternal/Devices/serial/0/LUN#0/Config/DevicePath" DevicePath
(for example /dev/ttyS0 for the first serial port (COM1))

be sure to have read/write permissions on the device file.
I'm able to program my Asuro robot on an windows guest (it's a little
bit slow but it works).

The patch is licensed under the MIT license.

Kind regards,
Alexander Eichner


Index: include/VBox/pdmifs.h
===================================================================
--- include/VBox/pdmifs.h	(Revision 4060)
+++ include/VBox/pdmifs.h	(Arbeitskopie)
@@ -1123,6 +1123,19 @@
      * @thread  Any thread.
      */
     DECLR3CALLBACKMEMBER(int, pfnWrite,(PPDMICHAR pInterface, const void *pvBuf, size_t cbWrite));
+
+    /**
+     * Set device parameters.
+     *
+     * @returns VBox status code.
+     * @param   pInterface      Pointer to the interface structure containing the called function pointer.
+     * @param   speed           Speed of the serial connection.
+     * @param   parity          Enable parity
+     * @param   data_bits       Number of data bits
+     * @param   stop_bits       Number of stop bits
+     * @thread  Any thread.
+     */
+    DECLR3CALLBACKMEMBER(int, pfnSetParameters,(PPDMICHAR pInterface, int speed, int parity, int data_bits, int stop_bits));
 } PDMICHAR;
 
 
Index: src/VBox/Devices/Builtins.h
===================================================================
--- src/VBox/Devices/Builtins.h	(Revision 4060)
+++ src/VBox/Devices/Builtins.h	(Arbeitskopie)
@@ -76,6 +76,7 @@
 extern const PDMDRVREG g_DrvChar;
 extern const PDMDRVREG g_DrvNamedPipe;
 extern const PDMDRVREG g_DrvHostParallel;
+extern const PDMDRVREG g_DrvHostSerial;
 
 #ifdef VBOX_WITH_USB
 extern const PDMUSBREG g_UsbDevProxy;
Index: src/VBox/Devices/Serial/DevSerial.cpp
===================================================================
--- src/VBox/Devices/Serial/DevSerial.cpp	(Revision 4060)
+++ src/VBox/Devices/Serial/DevSerial.cpp	(Arbeitskopie)
@@ -178,7 +178,7 @@
 PDMBOTHCBDECL(int) serialIOPortWrite(PPDMDEVINS pDevIns, void *pvUser, RTIOPORT Port, uint32_t u32, unsigned cb);
 __END_DECLS
 
-
+#ifdef IN_RING3
 static void serial_update_irq(SerialState *s)
 {
     if ((s->lsr & UART_LSR_DR) && (s->ier & UART_IER_RDI)) {
@@ -226,7 +226,9 @@
         return;
     speed = 115200 / s->divider;
     Log(("speed=%d parity=%c data=%d stop=%d\n", speed, parity, data_bits, stop_bits));
+    s->pDrvChar->pfnSetParameters(s->pDrvChar, speed, parity, data_bits, stop_bits);
 }
+#endif
 
 static int serial_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 {
@@ -235,6 +237,12 @@
 
     addr &= 7;
     LogFlow(("serial: write addr=0x%02x val=0x%02x\n", addr, val));
+
+#ifndef IN_RING3
+    NOREF(ch);
+    NOREF(s);
+    return VINF_IOM_HC_IOPORT_WRITE;
+#else
     switch(addr) {
     default:
     case 0:
@@ -242,10 +250,6 @@
             s->divider = (s->divider & 0xff00) | val;
             serial_update_parameters(s);
         } else {
-#ifndef IN_RING3
-            NOREF(ch);
-            return VINF_IOM_HC_IOPORT_WRITE;
-#else
             s->thr_ipending = 0;
             s->lsr &= ~UART_LSR_THRE;
             serial_update_irq(s);
@@ -260,7 +264,6 @@
             s->lsr |= UART_LSR_THRE;
             s->lsr |= UART_LSR_TEMT;
             serial_update_irq(s);
-#endif
         }
         break;
     case 1:
@@ -300,6 +303,7 @@
         break;
     }
     return VINF_SUCCESS;
+#endif
 }
 
 static uint32_t serial_ioport_read(void *opaque, uint32_t addr, int *pRC)
@@ -338,11 +342,15 @@
         }
         break;
     case 2:
+#ifndef IN_RING3
+        *pRC = VINF_IOM_HC_IOPORT_READ;
+#else
         ret = s->iir;
         /* reset THR pending bit */
         if ((ret & 0x7) == UART_IIR_THRI)
             s->thr_ipending = 0;
         serial_update_irq(s);
+#endif
         break;
     case 3:
         ret = s->lcr;
Index: src/VBox/Devices/Serial/DrvChar.cpp
===================================================================
--- src/VBox/Devices/Serial/DrvChar.cpp	(Revision 4060)
+++ src/VBox/Devices/Serial/DrvChar.cpp	(Arbeitskopie)
@@ -130,7 +130,13 @@
     return VINF_SUCCESS;
 }
 
+static DECLCALLBACK(int) drvCharSetParameters(PPDMICHAR pInterface, int speed, int parity, int data_bits, int stop_bits)
+{
+    PDRVCHAR pData = PDMICHAR_2_DRVCHAR(pInterface);
 
+    LogFlow(("%s: speed=%d parity=%c data_bits=%d stop_bits=%d\n", __FUNCTION__, speed, parity, data_bits, stop_bits));
+}
+
 /* -=-=-=-=- receive thread -=-=-=-=- */
 
 /**
@@ -290,6 +296,7 @@
     pDrvIns->IBase.pfnQueryInterface        = drvCharQueryInterface;
     /* IChar. */
     pData->IChar.pfnWrite                   = drvCharWrite;
+    pData->IChar.pfnSetParameters           = drvCharSetParameters;
 
 
     /*
Index: src/VBox/Devices/Serial/DrvHostSerial.cpp
===================================================================
--- src/VBox/Devices/Serial/DrvHostSerial.cpp	(Revision 0)
+++ src/VBox/Devices/Serial/DrvHostSerial.cpp	(Revision 0)
@@ -0,0 +1,530 @@
+/** @file
+ *
+ * VBox stream I/O devices:
+ * Host serial driver
+ */
+
+/*
+ * Copyright (C) 2006-2007 innotek GmbH
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License as published by the Free Software Foundation,
+ * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
+ * distribution. VirtualBox OSE is distributed in the hope that it will
+ * be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * If you received this file as part of a commercial VirtualBox
+ * distribution, then only the terms of your commercial VirtualBox
+ * license agreement apply instead of the previous paragraph.
+ */
+
+
+
+/*******************************************************************************
+*   Header Files                                                               *
+*******************************************************************************/
+#define LOG_GROUP LOG_GROUP_DRV_CHAR
+#include <VBox/pdm.h>
+#include <VBox/err.h>
+
+#include <VBox/log.h>
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/stream.h>
+#include <iprt/semaphore.h>
+
+#ifdef RT_OS_LINUX
+#include <termios.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#endif
+
+#include "Builtins.h"
+
+
+/** Size of the send fifo queue (in bytes) */
+#define CHAR_MAX_SEND_QUEUE             0x80
+#define CHAR_MAX_SEND_QUEUE_MASK        0x7f
+
+/*******************************************************************************
+*   Structures and Typedefs                                                    *
+*******************************************************************************/
+
+/**
+ * Char driver instance data.
+ */
+typedef struct DRVHOSTSERIAL
+{
+    /** Pointer to the driver instance structure. */
+    PPDMDRVINS                  pDrvIns;
+    /** Pointer to the char port interface of the driver/device above us. */
+    PPDMICHARPORT               pDrvCharPort;
+    /** Our char interface. */
+    PDMICHAR                    IChar;
+    /** Flag to notify the receive thread it should terminate. */
+    volatile bool               fShutdown;
+    /** Receive thread ID. */
+    RTTHREAD                    ReceiveThread;
+    /** Send thread ID. */
+    RTTHREAD                    SendThread;
+    /** Send event semephore */
+    RTSEMEVENT                  SendSem;
+
+    /** the device path */
+    char                        *pszDevicePath;
+    /** the device handle */
+    int                         DeviceFile;
+
+    /** Internal send FIFO queue */
+    uint8_t                     aSendQueue[CHAR_MAX_SEND_QUEUE];
+    uint32_t                    iSendQueueHead;
+    uint32_t                    iSendQueueTail;
+
+    /** Read/write statistics */
+    STAMCOUNTER                 StatBytesRead;
+    STAMCOUNTER                 StatBytesWritten;
+} DRVHOSTSERIAL, *PDRVHOSTSERIAL;
+
+
+/** Converts a pointer to DRVCHAR::IChar to a PDRVHOSTSERIAL. */
+#define PDMICHAR_2_DRVHOSTSERIAL(pInterface) ( (PDRVHOSTSERIAL)((uintptr_t)pInterface - RT_OFFSETOF(DRVHOSTSERIAL, IChar)) )
+
+
+/* -=-=-=-=- IBase -=-=-=-=- */
+
+/**
+ * Queries an interface to the driver.
+ *
+ * @returns Pointer to interface.
+ * @returns NULL if the interface was not supported by the driver.
+ * @param   pInterface          Pointer to this interface structure.
+ * @param   enmInterface        The requested interface identification.
+ */
+static DECLCALLBACK(void *) drvHostSerialQueryInterface(PPDMIBASE pInterface, PDMINTERFACE enmInterface)
+{
+    PPDMDRVINS  pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
+    PDRVHOSTSERIAL    pData = PDMINS2DATA(pDrvIns, PDRVHOSTSERIAL);
+    switch (enmInterface)
+    {
+        case PDMINTERFACE_BASE:
+            return &pDrvIns->IBase;
+        case PDMINTERFACE_CHAR:
+            return &pData->IChar;
+        default:
+            return NULL;
+    }
+}
+
+
+/* -=-=-=-=- IChar -=-=-=-=- */
+
+/** @copydoc PDMICHAR::pfnWrite */
+static DECLCALLBACK(int) drvHostSerialWrite(PPDMICHAR pInterface, const void *pvBuf, size_t cbWrite)
+{
+    PDRVHOSTSERIAL pData = PDMICHAR_2_DRVHOSTSERIAL(pInterface);
+    const char *pBuffer = (const char *)pvBuf;
+
+    LogFlow(("%s: pvBuf=%#p cbWrite=%d\n", __FUNCTION__, pvBuf, cbWrite));
+
+    for (uint32_t i=0;i<cbWrite;i++)
+    {
+        uint32_t idx = pData->iSendQueueHead;
+
+        pData->aSendQueue[idx] = pBuffer[i];
+        idx = (idx + 1) & CHAR_MAX_SEND_QUEUE_MASK;
+
+        STAM_COUNTER_INC(&pData->StatBytesWritten);
+        ASMAtomicXchgU32(&pData->iSendQueueHead, idx);
+    }
+    RTSemEventSignal(pData->SendSem);
+    return VINF_SUCCESS;
+}
+
+static DECLCALLBACK(int) drvHostSerialSetParameters(PPDMICHAR pInterface, int speed, int parity, int data_bits, int stop_bits)
+{
+    PDRVHOSTSERIAL pData = PDMICHAR_2_DRVHOSTSERIAL(pInterface);
+    struct termios termiosSetup;
+    int baud_rate;
+
+    LogFlow(("%s: speed=%d parity=%c data_bits=%d stop_bits=%d\n", __FUNCTION__, speed, parity, data_bits, stop_bits));
+
+    memset(&termiosSetup, 0, sizeof(termiosSetup));
+
+    /* Enable receiver */
+    termiosSetup.c_cflag |= (CLOCAL | CREAD);
+
+    switch (speed) {
+        case 50:
+            baud_rate = B50;
+            break;
+        case 75:
+            baud_rate = B75;
+            break;
+        case 110:
+            baud_rate = B110;
+            break;
+        case 134:
+            baud_rate = B134;
+            break;
+        case 150:
+            baud_rate = B150;
+            break;
+        case 200:
+            baud_rate = B200;
+            break;
+        case 300:
+            baud_rate = B300;
+            break;
+        case 600:
+            baud_rate = B600;
+            break;
+        case 1200:
+            baud_rate = B1200;
+            break;
+        case 1800:
+            baud_rate = B1800;
+            break;
+        case 2400:
+            baud_rate = B2400;
+            break;
+        case 4800:
+            baud_rate = B4800;
+            break;
+        case 9600:
+            baud_rate = B9600;
+            break;
+        case 19200:
+            baud_rate = B19200;
+            break;
+        case 38400:
+            baud_rate = B38400;
+            break;
+        case 57600:
+            baud_rate = B57600;
+            break;
+        case 115200:
+            baud_rate = B115200;
+            break;
+        default:
+            baud_rate = B9600;
+    }
+
+    cfsetispeed(&termiosSetup, baud_rate);
+    cfsetospeed(&termiosSetup, baud_rate);
+
+    switch (parity) {
+        case 'E':
+            termiosSetup.c_cflag |= PARENB;
+            break;
+        case 'O':
+            termiosSetup.c_cflag |= (PARENB | PARODD);
+            break;
+        case 'N':
+            break;
+        default:
+            break;
+    }
+
+    switch (data_bits) {
+        case 5:
+            termiosSetup.c_cflag |= CS5;
+            break;
+        case 6:
+            termiosSetup.c_cflag |= CS6;
+            break;
+        case 7:
+            termiosSetup.c_cflag |= CS7;
+            break;
+        case 8:
+            termiosSetup.c_cflag |= CS8;
+            break;
+        default:
+            break;
+    }
+
+    switch (stop_bits) {
+        case 2:
+            termiosSetup.c_cflag |= CSTOPB;
+        default:
+            break;
+    }
+
+    /* set serial port to raw input */
+    termiosSetup.c_lflag = ~(ICANON | ECHO | ECHOE | ISIG); 
+
+    tcsetattr(pData->DeviceFile, TCSANOW, &termiosSetup);
+}
+
+/* -=-=-=-=- receive thread -=-=-=-=- */
+
+/**
+ * Send thread loop.
+ *
+ * @returns 0 on success.
+ * @param   ThreadSelf  Thread handle to this thread.
+ * @param   pvUser      User argument.
+ */
+static DECLCALLBACK(int) drvHostSerialSendLoop(RTTHREAD ThreadSelf, void *pvUser)
+{
+    PDRVHOSTSERIAL pData = (PDRVHOSTSERIAL)pvUser;
+
+    for(;;)
+    {
+        int rc = RTSemEventWait(pData->SendSem, RT_INDEFINITE_WAIT);
+        if (VBOX_FAILURE(rc))
+            break;
+
+        /*
+         * Write the character to the host device.
+         */
+        if (!pData->fShutdown) 
+        {
+            while (pData->iSendQueueTail != pData->iSendQueueHead)
+            {
+                size_t cbProcessed = 1;
+
+                rc = write(pData->DeviceFile, &pData->aSendQueue[pData->iSendQueueTail], cbProcessed);
+                if (rc > 0)
+                {
+                    Assert(cbProcessed);
+                    pData->iSendQueueTail++;
+                    pData->iSendQueueTail &= CHAR_MAX_SEND_QUEUE_MASK;
+                }
+                else if (rc < 0)
+                {
+                    LogFlow(("Write failed with %Vrc; skipping\n", rc));
+                    break;
+                }
+            }
+        }
+        else
+            break;
+    }
+
+    pData->SendThread = NIL_RTTHREAD;
+
+    return VINF_SUCCESS;
+}
+
+
+/* -=-=-=-=- receive thread -=-=-=-=- */
+
+/**
+ * Receive thread loop.
+ *
+ * @returns 0 on success.
+ * @param   ThreadSelf  Thread handle to this thread.
+ * @param   pvUser      User argument.
+ */
+static DECLCALLBACK(int) drvHostSerialReceiveLoop(RTTHREAD ThreadSelf, void *pvUser)
+{
+    PDRVHOSTSERIAL pData = (PDRVHOSTSERIAL)pvUser;
+    char aBuffer[256], *pBuffer;
+    size_t cbRemaining, cbProcessed;
+    int rc;
+
+    cbRemaining = 0;
+    pBuffer = aBuffer;
+    while (!pData->fShutdown)
+    {
+        if (!cbRemaining)
+        {
+            /* Get block of data from stream driver. */
+            cbRemaining = sizeof(aBuffer);
+            rc = read(pData->DeviceFile, aBuffer, cbRemaining);
+            if (rc < 0)
+            {
+                LogFlow(("Read failed with %Vrc\n", rc));
+                break;
+            } else {
+                cbRemaining = rc;
+            }
+            pBuffer = aBuffer;
+        }
+        else
+        {
+            /* Send data to guest. */
+            cbProcessed = cbRemaining;
+            rc = pData->pDrvCharPort->pfnNotifyRead(pData->pDrvCharPort, pBuffer, &cbProcessed);
+            if (VBOX_SUCCESS(rc))
+            {
+                Assert(cbProcessed);
+                pBuffer += cbProcessed;
+                cbRemaining -= cbProcessed;
+                STAM_COUNTER_ADD(&pData->StatBytesRead, cbProcessed);
+            }
+            else if (rc == VERR_TIMEOUT)
+            {
+                /* Normal case, just means that the guest didn't accept a new
+                 * character before the timeout elapsed. Just retry. */
+                rc = VINF_SUCCESS;
+            }
+            else
+            {
+                LogFlow(("NotifyRead failed with %Vrc\n", rc));
+                break;
+            }
+        }
+    }
+
+    pData->ReceiveThread = NIL_RTTHREAD;
+
+    return VINF_SUCCESS;
+}
+
+
+/* -=-=-=-=- driver interface -=-=-=-=- */
+
+/**
+ * Construct a char driver instance.
+ *
+ * @returns VBox status.
+ * @param   pDrvIns     The driver instance data.
+ *                      If the registration structure is needed,
+ *                      pDrvIns->pDrvReg points to it.
+ * @param   pCfgHandle  Configuration node handle for the driver. Use this to
+ *                      obtain the configuration of the driver instance. It's
+ *                      also found in pDrvIns->pCfgHandle as it's expected to
+ *                      be used frequently in this function.
+ */
+static DECLCALLBACK(int) drvHostSerialConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfgHandle)
+{
+    PDRVHOSTSERIAL pData = PDMINS2DATA(pDrvIns, PDRVHOSTSERIAL);
+    LogFlow(("%s: iInstance=%d\n", __FUNCTION__, pDrvIns->iInstance));
+
+    /*
+     * Init basic data members and interfaces.
+     */
+    pData->ReceiveThread                    = NIL_RTTHREAD;
+    pData->fShutdown                        = false;
+    /* IBase. */
+    pDrvIns->IBase.pfnQueryInterface        = drvHostSerialQueryInterface;
+    /* IChar. */
+    pData->IChar.pfnWrite                   = drvHostSerialWrite;
+    pData->IChar.pfnSetParameters           = drvHostSerialSetParameters;
+
+    /*
+     * Query configuration.
+     */
+    /* Device */
+    int rc = CFGMR3QueryStringAlloc(pCfgHandle, "DevicePath", &pData->pszDevicePath);
+    if (VBOX_FAILURE(rc))
+    {
+        AssertMsgFailed(("Configuration error: query for \"DevicePath\" string returned %Vra.\n", rc));
+        return rc;
+    }
+
+    /*
+     * Open the device
+     */
+    pData->DeviceFile = open(pData->pszDevicePath, O_RDWR | O_NONBLOCK);
+    if (pData->DeviceFile < 0) {
+        
+    }
+
+    /*
+     * Get the ICharPort interface of the above driver/device.
+     */
+    pData->pDrvCharPort = (PPDMICHARPORT)pDrvIns->pUpBase->pfnQueryInterface(pDrvIns->pUpBase, PDMINTERFACE_CHAR_PORT);
+    if (!pData->pDrvCharPort)
+        return PDMDrvHlpVMSetError(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE, RT_SRC_POS, N_("Char#%d has no char port interface above"), pDrvIns->iInstance);
+
+    rc = RTThreadCreate(&pData->ReceiveThread, drvHostSerialReceiveLoop, (void *)pData, 0, RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE, "Char Receive");
+    if (VBOX_FAILURE(rc))
+        return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("Char#%d cannot create receive thread"), pDrvIns->iInstance);
+
+    rc = RTSemEventCreate(&pData->SendSem);
+    AssertRC(rc);
+
+    rc = RTThreadCreate(&pData->SendThread, drvHostSerialSendLoop, (void *)pData, 0, RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE, "Char Send");
+    if (VBOX_FAILURE(rc))
+        return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("Char#%d cannot create send thread"), pDrvIns->iInstance);
+
+
+    PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatBytesWritten,    STAMTYPE_COUNTER, STAMVISIBILITY_USED, STAMUNIT_BYTES, "Nr of bytes written",         "/Devices/Char%d/Written", pDrvIns->iInstance);
+    PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatBytesRead,       STAMTYPE_COUNTER, STAMVISIBILITY_USED, STAMUNIT_BYTES, "Nr of bytes read",            "/Devices/Char%d/Read", pDrvIns->iInstance);
+    
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Destruct a char driver instance.
+ *
+ * Most VM resources are freed by the VM. This callback is provided so that
+ * any non-VM resources can be freed correctly.
+ *
+ * @param   pDrvIns     The driver instance data.
+ */
+static DECLCALLBACK(void) drvHostSerialDestruct(PPDMDRVINS pDrvIns)
+{
+    PDRVHOSTSERIAL     pData = PDMINS2DATA(pDrvIns, PDRVHOSTSERIAL);
+
+    LogFlow(("%s: iInstance=%d\n", __FUNCTION__, pDrvIns->iInstance));
+
+    pData->fShutdown = true;
+    if (pData->ReceiveThread)
+    {
+        RTThreadWait(pData->ReceiveThread, 1000, NULL);
+        if (pData->ReceiveThread != NIL_RTTHREAD)
+            LogRel(("Char%d: receive thread did not terminate\n", pDrvIns->iInstance));
+    }
+
+    /* Empty the send queue */
+    pData->iSendQueueTail = pData->iSendQueueHead = 0;
+
+    RTSemEventSignal(pData->SendSem);
+    RTSemEventDestroy(pData->SendSem);
+    pData->SendSem = NIL_RTSEMEVENT;
+
+    if (pData->SendThread)
+    {
+        RTThreadWait(pData->SendThread, 1000, NULL);
+        if (pData->SendThread != NIL_RTTHREAD)
+            LogRel(("Char%d: send thread did not terminate\n", pDrvIns->iInstance));
+    }
+}
+
+/**
+ * Char driver registration record.
+ */
+const PDMDRVREG g_DrvHostSerial =
+{
+    /* u32Version */
+    PDM_DRVREG_VERSION,
+    /* szDriverName */
+    "Host Serial",
+    /* pszDescription */
+    "Host serial driver.",
+    /* fFlags */
+    PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
+    /* fClass. */
+    PDM_DRVREG_CLASS_CHAR,
+    /* cMaxInstances */
+    ~0,
+    /* cbInstance */
+    sizeof(DRVHOSTSERIAL),
+    /* pfnConstruct */
+    drvHostSerialConstruct,
+    /* pfnDestruct */
+    drvHostSerialDestruct,
+    /* pfnIOCtl */
+    NULL,
+    /* pfnPowerOn */
+    NULL,
+    /* pfnReset */
+    NULL,
+    /* pfnSuspend */
+    NULL,
+    /* pfnResume */
+    NULL,
+    /* pfnDetach */
+    NULL,
+    /** pfnPowerOff */
+    NULL
+};
+
Index: src/VBox/Devices/Makefile.kmk
===================================================================
--- src/VBox/Devices/Makefile.kmk	(Revision 4060)
+++ src/VBox/Devices/Makefile.kmk	(Arbeitskopie)
@@ -427,7 +427,8 @@
 Drivers_SOURCES.linux = \
 	Network/DrvTAP.cpp \
 	Audio/ossaudio.c \
-	Parallel/DrvHostParallel.cpp
+	Parallel/DrvHostParallel.cpp \
+	Serial/DrvHostSerial.cpp
 
 ifeq ($(BUILD_TARGET),os2)
 Drivers_SOURCES      := $(filter-out \
Index: src/VBox/Devices/Builtins.cpp
===================================================================
--- src/VBox/Devices/Builtins.cpp	(Revision 4060)
+++ src/VBox/Devices/Builtins.cpp	(Arbeitskopie)
@@ -231,6 +231,10 @@
     rc = pCallbacks->pfnRegister(pCallbacks, &g_DrvHostParallel);
     if (VBOX_FAILURE(rc))
         return rc;
+
+    rc = pCallbacks->pfnRegister(pCallbacks, &g_DrvHostSerial);
+    if (VBOX_FAILURE(rc))
+        return rc;
 #endif
 
     return VINF_SUCCESS;
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