3 files changed, 27 insertions, 7 deletions
diff --git a/source/components/tables/tbfadt.c b/source/components/tables/tbfadt.c
index ae4052099fe5..e8773204478c 100644
--- a/source/components/tables/tbfadt.c
+++ b/source/components/tables/tbfadt.c
@@ -400,10 +400,6 @@ AcpiTbConvertFadt (
     UINT32                  i;
 
 
-    /* Update the local FADT table header length */
-
-    AcpiGbl_FADT.Header.Length = sizeof (ACPI_TABLE_FADT);
-
     /*
      * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
      * Later code will always use the X 64-bit field.
@@ -437,6 +433,13 @@ AcpiTbConvertFadt (
     }
 
     /*
+     * Now we can update the local FADT length to the length of the
+     * current FADT version as defined by the ACPI specification.
+     * Thus, we will have a common FADT internally.
+     */
+    AcpiGbl_FADT.Header.Length = sizeof (ACPI_TABLE_FADT);
+
+    /*
      * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
      * generic address structures as necessary. Later code will always use
      * the 64-bit address structures.
diff --git a/source/components/tables/tbinstal.c b/source/components/tables/tbinstal.c
index 5c6bd876f819..f100ab43f721 100644
--- a/source/components/tables/tbinstal.c
+++ b/source/components/tables/tbinstal.c
@@ -510,8 +510,10 @@ AcpiTbDeleteTable (
         ACPI_FREE (TableDesc->Pointer);
         break;
 
+    /* Not mapped or allocated, there is nothing we can do */
+
     default:
-        break;
+        return;
     }
 
     TableDesc->Pointer = NULL;
diff --git a/source/components/tables/tbutils.c b/source/components/tables/tbutils.c
index bfdcf0c29832..e8b5705e96e7 100644
--- a/source/components/tables/tbutils.c
+++ b/source/components/tables/tbutils.c
@@ -492,8 +492,9 @@ AcpiTbInstallTable (
      *
      * NOTE: If the table is overridden, then FinalTable will contain a
      * mapped pointer to the full new table. If the table is not overridden,
-     * then the table will be fully mapped elsewhere (in verify table).
-     * In any case, we must unmap the header that was mapped above.
+     * or if there has been a physical override, then the table will be
+     * fully mapped later (in verify table). In any case, we must
+     * unmap the header that was mapped above.
      */
     FinalTable = AcpiTbTableOverride (Table, TableDesc);
     if (!FinalTable)
@@ -510,6 +511,20 @@ AcpiTbInstallTable (
         AcpiUtSetIntegerWidth (FinalTable->Revision);
     }
 
+    /*
+     * If we have a physical override during this early loading of the ACPI
+     * tables, unmap the table for now. It will be mapped again later when
+     * it is actually used. This supports very early loading of ACPI tables,
+     * before virtual memory is fully initialized and running within the
+     * host OS. Note: A logical override has the ACPI_TABLE_ORIGIN_OVERRIDE
+     * flag set and will not be deleted below.
+     */
+    if (FinalTable != Table)
+    {
+        AcpiTbDeleteTable (TableDesc);
+    }
+
+
 UnmapAndExit:
 
     /* Always unmap the table header that we mapped above */