diff --git a/sys/compat/ndis/kern_ndis.c b/sys/compat/ndis/kern_ndis.c
index 39a8be47a55c..50b9e8f128da 100644
--- a/sys/compat/ndis/kern_ndis.c
+++ b/sys/compat/ndis/kern_ndis.c
@@ -477,12 +477,14 @@ ndis_convert_res(arg)
 	if (brl != NULL) {
 		SLIST_FOREACH(brle, brl, link) {
 			switch (brle->type) {
+#ifdef notdef
 			case SYS_RES_IOPORT:
 				prd->cprd_type = CmResourceTypePort;
 				prd->u.cprd_port.cprd_start.np_quad =
 				    brle->start;
 				prd->u.cprd_port.cprd_len = brle->count;
 				break;
+#endif
 			case SYS_RES_MEMORY:
 				prd->cprd_type = CmResourceTypeMemory;
 				prd->u.cprd_port.cprd_start.np_quad =
@@ -1084,6 +1086,8 @@ ndis_unload_driver(arg)
 	return(0);
 }
 
+#define NDIS_LOADED		0x42534F44
+
 int
 ndis_load_driver(img, arg)
 	vm_offset_t		img;
@@ -1102,22 +1106,34 @@ ndis_load_driver(img, arg)
 
 	sc = arg;
 
-	/* Perform text relocation */
-	if (pe_relocate(img))
-		return(ENOEXEC);
+	/*
+	 * Only perform the relocation/linking phase once
+	 * since the binary image may be shared among multiple
+	 * device instances.
+	 */
 
-        /* Dynamically link the NDIS.SYS routines -- required. */
-	if (pe_patch_imports(img, "NDIS", ndis_functbl))
-		return(ENOEXEC);
-
-	/* Dynamically link the HAL.dll routines -- also required. */
-	if (pe_patch_imports(img, "HAL", hal_functbl))
-		return(ENOEXEC);
-
-	/* Dynamically link ntoskrnl.exe -- optional. */
-	if (pe_get_import_descriptor(img, &imp_desc, "ntoskrnl") == 0) {
-		if (pe_patch_imports(img, "ntoskrnl", ntoskrnl_functbl))
+	ptr = (uint32_t *)(img + 8);
+	if (*ptr != NDIS_LOADED) {
+		/* Perform text relocation */
+		if (pe_relocate(img))
 			return(ENOEXEC);
+
+		/* Dynamically link the NDIS.SYS routines -- required. */
+		if (pe_patch_imports(img, "NDIS", ndis_functbl))
+			return(ENOEXEC);
+
+		/* Dynamically link the HAL.dll routines -- also required. */
+		if (pe_patch_imports(img, "HAL", hal_functbl))
+			return(ENOEXEC);
+
+		/* Dynamically link ntoskrnl.exe -- optional. */
+		if (pe_get_import_descriptor(img,
+		    &imp_desc, "ntoskrnl") == 0) {
+			if (pe_patch_imports(img,
+			    "ntoskrnl", ntoskrnl_functbl))
+				return(ENOEXEC);
+		}
+		*ptr = NDIS_LOADED;
 	}
 
         /* Locate the driver entry point */
diff --git a/sys/compat/ndis/subr_ntoskrnl.c b/sys/compat/ndis/subr_ntoskrnl.c
index 14a446b635fe..5376008cf998 100644
--- a/sys/compat/ndis/subr_ntoskrnl.c
+++ b/sys/compat/ndis/subr_ntoskrnl.c
@@ -119,8 +119,12 @@ __stdcall static uint32_t
 __stdcall static void ntoskrnl_freemdl(ndis_buffer *);
 __stdcall static void *ntoskrnl_mmaplockedpages(ndis_buffer *, uint8_t);
 __stdcall static void ntoskrnl_init_lock(kspin_lock *);
-__stdcall static void dummy(void);
 __stdcall static size_t ntoskrnl_memcmp(const void *, const void *, size_t);
+__stdcall static void ntoskrnl_init_ansi_string(ndis_ansi_string *, char *);
+__stdcall static void ntoskrnl_init_unicode_string(ndis_unicode_string *,
+	uint16_t *);
+__stdcall static void ntoskrnl_free_unicode_string(ndis_unicode_string *);
+__stdcall static void dummy(void);
 
 static struct mtx *ntoskrnl_interlock;
 extern struct mtx_pool *ndis_mtxpool;
@@ -185,8 +189,12 @@ ntoskrnl_unicode_to_ansi(dest, src, allocate)
 {
 	char			*astr = NULL;
 
+	if (dest == NULL || src == NULL)
+		return(NDIS_STATUS_FAILURE);
+
 	if (allocate) {
-		ndis_unicode_to_ascii(src->nus_buf, src->nus_len, &astr);
+		if (ndis_unicode_to_ascii(src->nus_buf, src->nus_len, &astr))
+			return(NDIS_STATUS_FAILURE);
 		dest->nas_buf = astr;
 		dest->nas_len = dest->nas_maxlen = strlen(astr);
 	} else {
@@ -646,6 +654,60 @@ ntoskrnl_memcmp(s1, s2, len)
 	return(total);
 }
 
+__stdcall static void
+ntoskrnl_init_ansi_string(dst, src)
+	ndis_ansi_string	*dst;
+	char			*src;
+{
+	ndis_ansi_string	*a;
+
+	a = dst;
+	if (a == NULL)
+		return;
+	if (src == NULL) {
+		a->nas_len = a->nas_maxlen = 0;
+		a->nas_buf = NULL;
+	} else {
+		a->nas_buf = src;
+		a->nas_len = a->nas_maxlen = strlen(src);
+	}
+
+	return;
+}
+
+__stdcall static void
+ntoskrnl_init_unicode_string(dst, src)
+	ndis_unicode_string	*dst;
+	uint16_t		*src;
+{
+	ndis_unicode_string	*u;
+	int			i;
+
+	u = dst;
+	if (u == NULL)
+		return;
+	if (src == NULL) {
+		u->nus_len = u->nus_maxlen = 0;
+		u->nus_buf = NULL;
+	} else {
+		i = 0;
+		while(src[i] != 0)
+			i++;
+		u->nus_buf = src;
+		u->nus_len = u->nus_maxlen = i * 2;
+	}
+
+	return;
+}
+
+__stdcall static void
+ntoskrnl_free_unicode_string(ustr)
+	ndis_unicode_string	*ustr;
+{
+	free(ustr->nus_buf, M_DEVBUF);
+	return;
+}
+
 __stdcall static void
 dummy()
 {
@@ -659,6 +721,10 @@ image_patch_table ntoskrnl_functbl[] = {
 	{ "RtlEqualUnicodeString",	(FUNC)ntoskrnl_unicode_equal },
 	{ "RtlCopyUnicodeString",	(FUNC)ntoskrnl_unicode_copy },
 	{ "RtlUnicodeStringToAnsiString", (FUNC)ntoskrnl_unicode_to_ansi },
+	{ "RtlAnsiStringToUnicodeString", (FUNC)ntoskrnl_ansi_to_unicode },
+	{ "RtlInitAnsiString",		(FUNC)ntoskrnl_init_ansi_string },
+	{ "RtlInitUnicodeString",	(FUNC)ntoskrnl_init_unicode_string },
+	{ "RtlFreeUnicodeString",	(FUNC)ndoskrnl_free_unicode_string },
 	{ "sprintf",			(FUNC)sprintf },
 	{ "DbgPrint",			(FUNC)printf },
 	{ "strncmp",			(FUNC)strncmp },