2 files changed, 15 insertions, 3 deletions
diff --git a/MdeModulePkg/Universal/Disk/PartitionDxe/Gpt.c b/MdeModulePkg/Universal/Disk/PartitionDxe/Gpt.c
index 7bcfe69..68d5830 100644
--- a/MdeModulePkg/Universal/Disk/PartitionDxe/Gpt.c
+++ b/MdeModulePkg/Universal/Disk/PartitionDxe/Gpt.c
@@ -339,10 +339,12 @@ PartitionInstallGptChildHandles (
   for (Index = 0; Index < PrimaryHeader->NumberOfPartitionEntries; Index++) {
     if (CompareGuid (&PartEntry[Index].PartitionTypeGUID, &gEfiPartTypeUnusedGuid) ||
         PEntryStatus[Index].OutOfRange ||
-        PEntryStatus[Index].Overlap
+        PEntryStatus[Index].Overlap ||
+        PEntryStatus[Index].OsSpecific
         ) {
       //
-      // Don't use null EFI Partition Entries or Invalid Partition Entries
+      // Don't use null EFI Partition Entries, Invalid Partition Entries or OS specific
+      // partition Entries
       //
       continue;
     }
@@ -652,6 +654,7 @@ PartitionCheckGptEntry (
   EFI_LBA EndingLBA;
   UINTN   Index1;
   UINTN   Index2;
+  UINT64  Attributes;
 
   DEBUG ((EFI_D_INFO, " start check partition entries\n"));
   for (Index1 = 0; Index1 < PartHeader->NumberOfPartitionEntries; Index1++) {
@@ -687,6 +690,14 @@ PartitionCheckGptEntry (
 
       }
     }
+
+    Attributes = PartEntry[Index1].Attributes;
+    if ((Attributes & BIT1) != 0) {
+      //
+      // If Bit 1 is set, this indicate that this is an OS specific GUID partition. 
+      //
+      PEntryStatus[Index1].OsSpecific = TRUE;
+    }
   }
 
   DEBUG ((EFI_D_INFO, " End check partition entries\n"));
diff --git a/MdeModulePkg/Universal/Disk/PartitionDxe/Partition.h b/MdeModulePkg/Universal/Disk/PartitionDxe/Partition.h
index 6b0d734..d1288ba 100644
--- a/MdeModulePkg/Universal/Disk/PartitionDxe/Partition.h
+++ b/MdeModulePkg/Universal/Disk/PartitionDxe/Partition.h
@@ -4,7 +4,7 @@
   of the raw block devices media. Currently "El Torito CD-ROM", Legacy 
   MBR, and GPT partition schemes are supported.
 
-Copyright (c) 2006 - 2008, Intel Corporation. <BR>
+Copyright (c) 2006 - 2009, Intel Corporation. <BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -92,6 +92,7 @@ extern EFI_COMPONENT_NAME2_PROTOCOL  gPartitionComponentName2;
 typedef struct {
   BOOLEAN OutOfRange;
   BOOLEAN Overlap;
+  BOOLEAN OsSpecific;
 } EFI_PARTITION_ENTRY_STATUS;
 
 //