diff -Naur old-rc2/drivers/scsi/megaraid/mega_common.h new-rc2/drivers/scsi/megaraid/mega_common.h
--- old-rc2/drivers/scsi/megaraid/mega_common.h	2004-10-18 17:54:31.000000000 -0400
+++ new-rc2/drivers/scsi/megaraid/mega_common.h	2004-12-02 20:23:35.000000000 -0500
@@ -242,6 +242,15 @@
 					[SCP2TARGET(scp)] & 0xFF);	\
 	}
 
+/**
+ * MRAID_LD_TARGET
+ * @param adp		- Adapter's soft state
+ * @param ld		- Logical drive number
+ *
+ * Macro to retrieve the SCSI target id of a logical drive
+ */
+#define MRAID_LD_TARGET(adp, ld) (((ld) < (adp)->init_id) ? (ld) : (ld)+1)	
+
 /*
  * ### Helper routines ###
  */
diff -Naur old-rc2/drivers/scsi/megaraid/megaraid_ioctl.h new-rc2/drivers/scsi/megaraid/megaraid_ioctl.h
--- old-rc2/drivers/scsi/megaraid/megaraid_ioctl.h	2004-12-02 20:20:16.000000000 -0500
+++ new-rc2/drivers/scsi/megaraid/megaraid_ioctl.h	2004-12-02 20:23:25.000000000 -0500
@@ -51,8 +51,11 @@
 #define MEGAIOC_QNADAP		'm'	/* Query # of adapters		*/
 #define MEGAIOC_QDRVRVER	'e'	/* Query driver version		*/
 #define MEGAIOC_QADAPINFO   	'g'	/* Query adapter information	*/
+#define MEGAIOC_ADD_LD		'a'
+#define MEGAIOC_DEL_LD		'r'
 
 #define USCSICMD		0x80
+#define UIOC_NONE		0x00000
 #define UIOC_RD			0x00001
 #define UIOC_WR			0x00002
 
@@ -62,6 +65,8 @@
 #define GET_ADAP_INFO		0x30000
 #define GET_CAP			0x40000
 #define GET_STATS		0x50000
+#define	ADD_LD			0x60000
+#define DEL_LD			0x70000
 #define GET_IOCTL_VERSION	0x01
 
 #define EXT_IOCTL_SIGN_SZ	16
diff -Naur old-rc2/drivers/scsi/megaraid/megaraid_mbox.c new-rc2/drivers/scsi/megaraid/megaraid_mbox.c
--- old-rc2/drivers/scsi/megaraid/megaraid_mbox.c	2004-12-02 20:20:16.000000000 -0500
+++ new-rc2/drivers/scsi/megaraid/megaraid_mbox.c	2004-12-02 20:32:33.408278216 -0500
@@ -10,7 +10,7 @@
  *	   2 of the License, or (at your option) any later version.
  *
  * FILE		: megaraid_mbox.c
- * Version	: v2.20.4.1 (Nov 04 2004)
+ * Version	: v2.20.4.1+ TEST VERSION
  *
  * Authors:
  * 	Atul Mukker		<Atul.Mukker@lsil.com>
@@ -3642,6 +3642,10 @@
 megaraid_mbox_mm_handler(unsigned long drvr_data, uioc_t *kioc, uint32_t action)
 {
 	adapter_t *adapter;
+	uint32_t ld;
+	struct scsi_device* sdev;
+	int ch;
+	int tg;
 
 	if (action != IOCTL_ISSUE) {
 		con_log(CL_ANN, (KERN_WARNING
@@ -3670,6 +3674,31 @@
 
 		return kioc->status;
 
+	case ADD_LD:
+		ld = *(uint32_t*) kioc->buf_vaddr;
+		ch = adapter->max_channel;
+		tg = MRAID_LD_TARGET( adapter, ld );
+		scsi_add_device(adapter->host, ch, tg, 0);
+
+		kioc->status = 0;
+		kioc->done(kioc);
+		return kioc->status;
+
+	case DEL_LD:
+		ld = *(uint32_t*) kioc->buf_vaddr;
+		ch = adapter->max_channel;
+		tg = MRAID_LD_TARGET( adapter, ld );
+		sdev = scsi_device_lookup( adapter->host, ch, tg, 0);
+		
+		if( sdev ) {
+			scsi_remove_device( sdev );
+			scsi_device_put( sdev );
+		}
+
+		kioc->status = 0;
+		kioc->done(kioc);
+		return kioc->status;
+
 	case MBOX_CMD:
 
 		return megaraid_mbox_mm_command(adapter, kioc);
diff -Naur old-rc2/drivers/scsi/megaraid/megaraid_mbox.h new-rc2/drivers/scsi/megaraid/megaraid_mbox.h
--- old-rc2/drivers/scsi/megaraid/megaraid_mbox.h	2004-12-02 20:20:16.000000000 -0500
+++ new-rc2/drivers/scsi/megaraid/megaraid_mbox.h	2004-12-02 20:32:09.737876664 -0500
@@ -21,8 +21,8 @@
 #include "megaraid_ioctl.h"
 
 
-#define MEGARAID_VERSION	"2.20.4.1"
-#define MEGARAID_EXT_VERSION	"(Release Date: Thu Nov  4 17:44:59 EST 2004)"
+#define MEGARAID_VERSION	"2.20.4.1+ TEST VERSION"
+#define MEGARAID_EXT_VERSION	"(Release Date: TEST VERSION)"
 
 
 /*
diff -Naur old-rc2/drivers/scsi/megaraid/megaraid_mm.c new-rc2/drivers/scsi/megaraid/megaraid_mm.c
--- old-rc2/drivers/scsi/megaraid/megaraid_mm.c	2004-12-02 20:20:16.000000000 -0500
+++ new-rc2/drivers/scsi/megaraid/megaraid_mm.c	2004-12-02 20:22:57.000000000 -0500
@@ -373,6 +373,34 @@
 			if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
 				return (-ENOMEM);
 		}
+		else if (subopcode == MEGAIOC_ADD_LD) {
+
+			kioc->opcode	= ADD_LD;
+			kioc->data_dir	= UIOC_NONE;
+			kioc->xferlen	= sizeof(uint32_t);
+
+			if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
+				return -(ENOMEM);
+
+			if (copy_from_user(kioc->buf_vaddr, mimd.data,
+							kioc->xferlen)) {
+				return (-EFAULT);
+			}
+		}
+		else if (subopcode == MEGAIOC_DEL_LD) {
+
+			kioc->opcode	= DEL_LD;
+			kioc->data_dir	= UIOC_NONE;
+			kioc->xferlen	= sizeof(uint32_t);
+
+			if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
+				return -(ENOMEM);
+
+			if (copy_from_user(kioc->buf_vaddr, mimd.data,
+							kioc->xferlen)) {
+				return (-EFAULT);
+			}
+		}
 		else {
 			con_log(CL_ANN, (KERN_WARNING
 					"megaraid cmm: Invalid subop\n"));
@@ -809,6 +837,9 @@
 
 			return 0;
 
+		case MEGAIOC_ADD_LD:
+		case MEGAIOC_DEL_LD:
+			return 0;
 		default:
 			return (-EINVAL);
 		}
diff -Naur old-rc2/drivers/scsi/megaraid/megaraid_mm.h new-rc2/drivers/scsi/megaraid/megaraid_mm.h
--- old-rc2/drivers/scsi/megaraid/megaraid_mm.h	2004-12-02 20:20:16.000000000 -0500
+++ new-rc2/drivers/scsi/megaraid/megaraid_mm.h	2004-12-02 20:33:00.709127856 -0500
@@ -29,9 +29,9 @@
 #include "megaraid_ioctl.h"
 
 
-#define LSI_COMMON_MOD_VERSION	"2.20.2.2"
+#define LSI_COMMON_MOD_VERSION	"2.20.2.2+ TEST VERSION"
 #define LSI_COMMON_MOD_EXT_VERSION	\
-		"(Release Date: Thu Nov  4 17:46:29 EST 2004)"
+		"(Release Date: TEST VERSION)"
 
 
 #define LSI_DBGLVL			dbglevel