diff --git a/sys/contrib/dev/acpica/dbstats.c b/sys/contrib/dev/acpica/dbstats.c
index 8a2f261281c6..d7b2cc05c73a 100644
--- a/sys/contrib/dev/acpica/dbstats.c
+++ b/sys/contrib/dev/acpica/dbstats.c
@@ -141,9 +141,11 @@ AcpiDbClassifyOneObject (
     void                    *Context,
     void                    **ReturnValue);
 
+#if defined ACPI_DBG_TRACK_ALLOCATIONS || defined ACPI_USE_LOCAL_CACHE
 static void
 AcpiDbListInfo (
     ACPI_MEMORY_LIST        *List);
+#endif
 
 
 /*
@@ -522,17 +524,18 @@ AcpiDbDisplayStatistics (
     case CMD_STAT_MEMORY:
 
 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
-        AcpiOsPrintf ("\n----Object and Cache Statistics (all in hex)---------\n");
+        AcpiOsPrintf ("\n----Object Statistics (all in hex)---------\n");
 
         AcpiDbListInfo (AcpiGbl_GlobalList);
         AcpiDbListInfo (AcpiGbl_NsNodeList);
+#endif
 
 #ifdef ACPI_USE_LOCAL_CACHE
+        AcpiOsPrintf ("\n----Cache Statistics (all in hex)----------\n");
         AcpiDbListInfo (AcpiGbl_OperandCache);
         AcpiDbListInfo (AcpiGbl_PsNodeCache);
         AcpiDbListInfo (AcpiGbl_PsNodeExtCache);
         AcpiDbListInfo (AcpiGbl_StateCache);
-#endif
 #endif
 
         break;
diff --git a/sys/contrib/dev/acpica/nsparse.c b/sys/contrib/dev/acpica/nsparse.c
index 21ff6a48b07e..8cb17a712517 100644
--- a/sys/contrib/dev/acpica/nsparse.c
+++ b/sys/contrib/dev/acpica/nsparse.c
@@ -211,7 +211,8 @@ AcpiNsOneCompleteParse (
 
     /* Parse the AML */
 
-    ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "*PARSE* pass %d parse\n", PassNumber));
+    ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "*PARSE* pass %lu parse\n",
+        (unsigned long) PassNumber));
     Status = AcpiPsParseAml (WalkState);
 
     AcpiPsDeleteParseTree (ParseRoot);
diff --git a/sys/contrib/dev/acpica/tbfadt.c b/sys/contrib/dev/acpica/tbfadt.c
index c22cf5ec7595..554e46427516 100644
--- a/sys/contrib/dev/acpica/tbfadt.c
+++ b/sys/contrib/dev/acpica/tbfadt.c
@@ -320,7 +320,7 @@ AcpiTbCreateLocalFadt (
     if (Length > sizeof (ACPI_TABLE_FADT))
     {
         ACPI_WARNING ((AE_INFO,
-            "FADT (revision %u) is longer than ACPI 2.0 version, truncating length 0x%X to 0x%X",
+            "FADT (revision %u) is longer than ACPI 2.0 version, truncating length 0x%X to 0x%zX",
             Table->Revision, Length, sizeof (ACPI_TABLE_FADT)));
     }
 
diff --git a/sys/contrib/dev/acpica/tbxface.c b/sys/contrib/dev/acpica/tbxface.c
index 1e820dd7c350..a7a27c696e2f 100644
--- a/sys/contrib/dev/acpica/tbxface.c
+++ b/sys/contrib/dev/acpica/tbxface.c
@@ -535,6 +535,7 @@ AcpiTbLoadNamespace (
     ACPI_STATUS             Status;
     ACPI_TABLE_HEADER       *Table;
     ACPI_NATIVE_UINT        i;
+    BOOLEAN                 DsdtOverriden;
 
 
     ACPI_FUNCTION_TRACE (TbLoadNamespace);
@@ -558,6 +559,7 @@ AcpiTbLoadNamespace (
     /*
      * Find DSDT table
      */
+    DsdtOverriden = FALSE;
     Status = AcpiOsTableOverride (
                 AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Pointer, &Table);
     if (ACPI_SUCCESS (Status) && Table)
@@ -569,6 +571,7 @@ AcpiTbLoadNamespace (
         AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Pointer = Table;
         AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Length = Table->Length;
         AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Flags = ACPI_TABLE_ORIGIN_UNKNOWN;
+        DsdtOverriden = TRUE;
 
         ACPI_INFO ((AE_INFO, "Table DSDT replaced by host OS"));
         AcpiTbPrintTableHeader (0, Table);
@@ -598,7 +601,7 @@ AcpiTbLoadNamespace (
      * Load any SSDT or PSDT tables. Note: Loop leaves tables locked
      */
     (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
-    for (i = 0; i < AcpiGbl_RootTableList.Count; ++i)
+    for (i = 2; i < AcpiGbl_RootTableList.Count; ++i)
     {
         if ((!ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
                     ACPI_SIG_SSDT) &&
@@ -609,6 +612,15 @@ AcpiTbLoadNamespace (
             continue;
         }
 
+        /* Delete SSDT when DSDT is overriden */
+
+        if (ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
+                    ACPI_SIG_SSDT) && DsdtOverriden)
+        {
+            AcpiTbDeleteTable (&AcpiGbl_RootTableList.Tables[i]);
+            continue;
+        }
+
         /* Ignore errors while loading tables, get as many as possible */
 
         (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);