diff --git a/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.c b/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.c
index 8c6f7e326f..91b3a87413 100644
--- a/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.c
+++ b/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.c
@@ -7,10 +7,159 @@
 
 #include "UefiPayloadEntry.h"
 
+STATIC UINT32 mTopOfLowerUsableDram = 0;
+
 /**
    Callback function to build resource descriptor HOB
 
    This function build a HOB based on the memory map entry info.
+   It creates only EFI_RESOURCE_MEMORY_MAPPED_IO and EFI_RESOURCE_MEMORY_RESERVED
+   resources.
+
+   @param MemoryMapEntry         Memory map entry info got from bootloader.
+   @param Params                 A pointer to ACPI_BOARD_INFO.
+
+  @retval EFI_SUCCESS            Successfully build a HOB.
+  @retval EFI_INVALID_PARAMETER  Invalid parameter provided.
+**/
+EFI_STATUS
+MemInfoCallbackMmio (
+  IN MEMROY_MAP_ENTRY          *MemoryMapEntry,
+  IN VOID                      *Params
+  )
+{
+  EFI_PHYSICAL_ADDRESS         Base;
+  EFI_RESOURCE_TYPE            Type;
+  UINT64                       Size;
+  EFI_RESOURCE_ATTRIBUTE_TYPE  Attribue;
+  ACPI_BOARD_INFO              *AcpiBoardInfo;
+
+  AcpiBoardInfo = (ACPI_BOARD_INFO *)Params;
+  if (AcpiBoardInfo == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // Skip types already handled in MemInfoCallback
+  //
+  if (MemoryMapEntry->Type == E820_RAM || MemoryMapEntry->Type == E820_ACPI) {
+    return EFI_SUCCESS;
+  }
+
+  if (MemoryMapEntry->Base == AcpiBoardInfo->PcieBaseAddress) {
+    //
+    // MMCONF is always MMIO
+    //
+    Type = EFI_RESOURCE_MEMORY_MAPPED_IO;
+  } else if (MemoryMapEntry->Base < mTopOfLowerUsableDram) {
+    //
+    // It's in DRAM and thus must be reserved
+    //
+    Type = EFI_RESOURCE_MEMORY_RESERVED;
+  } else if ((MemoryMapEntry->Base < 0x100000000ULL) && (MemoryMapEntry->Base >= mTopOfLowerUsableDram)) {
+    //
+    // It's not in DRAM, must be MMIO
+    //
+    Type = EFI_RESOURCE_MEMORY_MAPPED_IO;
+  } else {
+    Type = EFI_RESOURCE_MEMORY_RESERVED;
+  }
+
+  Base    = MemoryMapEntry->Base;
+  Size    = MemoryMapEntry->Size;
+
+  Attribue = EFI_RESOURCE_ATTRIBUTE_PRESENT |
+             EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
+             EFI_RESOURCE_ATTRIBUTE_TESTED |
+             EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |
+             EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |
+             EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
+             EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE;
+
+  BuildResourceDescriptorHob (Type, Attribue, (EFI_PHYSICAL_ADDRESS)Base, Size);
+  DEBUG ((DEBUG_INFO , "buildhob: base = 0x%lx, size = 0x%lx, type = 0x%x\n", Base, Size, Type));
+
+  if (MemoryMapEntry->Type == E820_UNUSABLE ||
+    MemoryMapEntry->Type == E820_DISABLED) {
+    BuildMemoryAllocationHob (Base, Size, EfiUnusableMemory);
+  } else if (MemoryMapEntry->Type == E820_PMEM) {
+    BuildMemoryAllocationHob (Base, Size, EfiPersistentMemory);
+  }
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+   Callback function to find TOLUD (Top of Lower Usable DRAM)
+
+   Estimate where TOLUD (Top of Lower Usable DRAM) resides. The exact position
+   would require platform specific code.
+
+   @param MemoryMapEntry         Memory map entry info got from bootloader.
+   @param Params                 Not used for now.
+
+  @retval EFI_SUCCESS            Successfully updated mTopOfLowerUsableDram.
+**/
+EFI_STATUS
+FindToludCallback (
+  IN MEMROY_MAP_ENTRY          *MemoryMapEntry,
+  IN VOID                      *Params
+  )
+{
+  //
+  // This code assumes that the memory map on this x86 machine below 4GiB is continous
+  // until TOLUD. In addition it assumes that the bootloader provided memory tables have
+  // no "holes" and thus the first memory range not covered by e820 marks the end of
+  // usable DRAM. In addition it's assumed that every reserved memory region touching
+  // usable RAM is also covering DRAM, everything else that is marked reserved thus must be
+  // MMIO not detectable by bootloader/OS
+  //
+
+  //
+  // Skip memory types not RAM or reserved
+  //
+  if ((MemoryMapEntry->Type == E820_UNUSABLE) || (MemoryMapEntry->Type == E820_DISABLED) ||
+    (MemoryMapEntry->Type == E820_PMEM)) {
+    return EFI_SUCCESS;
+  }
+
+  //
+  // Skip resources above 4GiB
+  //
+  if ((MemoryMapEntry->Base + MemoryMapEntry->Size) > 0x100000000ULL) {
+    return EFI_SUCCESS;
+  }
+
+  if ((MemoryMapEntry->Type == E820_RAM) || (MemoryMapEntry->Type == E820_ACPI) ||
+    (MemoryMapEntry->Type == E820_NVS)) {
+    //
+    // It's usable DRAM. Update TOLUD.
+    //
+    if (mTopOfLowerUsableDram < (MemoryMapEntry->Base + MemoryMapEntry->Size)) {
+      mTopOfLowerUsableDram = (UINT32)(MemoryMapEntry->Base + MemoryMapEntry->Size);
+    }
+  } else {
+    //
+    // It might be 'reserved DRAM' or 'MMIO'.
+    //
+    // If it touches usable DRAM at Base assume it's DRAM as well,
+    // as it could be bootloader installed tables, TSEG, GTT, ...
+    //
+    if (mTopOfLowerUsableDram == MemoryMapEntry->Base) {
+      mTopOfLowerUsableDram = (UINT32)(MemoryMapEntry->Base + MemoryMapEntry->Size);
+    }
+  }
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+   Callback function to build resource descriptor HOB
+
+   This function build a HOB based on the memory map entry info.
+   Only add EFI_RESOURCE_SYSTEM_MEMORY.
 
    @param MemoryMapEntry         Memory map entry info got from bootloader.
    @param Params                 Not used for now.
@@ -28,7 +177,16 @@ MemInfoCallback (
   UINT64                       Size;
   EFI_RESOURCE_ATTRIBUTE_TYPE  Attribue;
 
-  Type    = (MemoryMapEntry->Type == 1) ? EFI_RESOURCE_SYSTEM_MEMORY : EFI_RESOURCE_MEMORY_RESERVED;
+  //
+  // Skip everything not known to be usable DRAM.
+  // It will be added later.
+  //
+  if ((MemoryMapEntry->Type != E820_RAM) && (MemoryMapEntry->Type != E820_ACPI) &&
+    (MemoryMapEntry->Type != E820_NVS)) {
+    return RETURN_SUCCESS;
+  }
+
+  Type    = EFI_RESOURCE_SYSTEM_MEMORY;
   Base    = MemoryMapEntry->Base;
   Size    = MemoryMapEntry->Size;
 
@@ -40,7 +198,7 @@ MemInfoCallback (
              EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
              EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE;
 
-  if (Base >= BASE_4GB ) {
+  if (Base >= BASE_4GB) {
     // Remove tested attribute to avoid DXE core to dispatch driver to memory above 4GB
     Attribue &= ~EFI_RESOURCE_ATTRIBUTE_TESTED;
   }
@@ -48,6 +206,12 @@ MemInfoCallback (
   BuildResourceDescriptorHob (Type, Attribue, (EFI_PHYSICAL_ADDRESS)Base, Size);
   DEBUG ((DEBUG_INFO , "buildhob: base = 0x%lx, size = 0x%lx, type = 0x%x\n", Base, Size, Type));
 
+  if (MemoryMapEntry->Type == E820_ACPI) {
+    BuildMemoryAllocationHob (Base, Size, EfiACPIReclaimMemory);
+  } else if (MemoryMapEntry->Type == E820_NVS) {
+    BuildMemoryAllocationHob (Base, Size, EfiACPIMemoryNVS);
+  }
+
   return RETURN_SUCCESS;
 }
 
@@ -238,8 +402,19 @@ BuildHobFromBl (
   UNIVERSAL_PAYLOAD_ACPI_TABLE     *AcpiTableHob;
 
   //
-  // Parse memory info and build memory HOBs
+  // First find TOLUD
   //
+  DEBUG ((DEBUG_INFO , "Guessing Top of Lower Usable DRAM:\n"));
+  Status = ParseMemoryInfo (FindToludCallback, NULL);
+  if (EFI_ERROR(Status)) {
+    return Status;
+  }
+  DEBUG ((DEBUG_INFO , "Assuming TOLUD = 0x%x\n", mTopOfLowerUsableDram));
+
+  //
+  // Parse memory info and build memory HOBs for Usable RAM
+  //
+  DEBUG ((DEBUG_INFO , "Building ResourceDescriptorHobs for usable memory:\n"));
   Status = ParseMemoryInfo (MemInfoCallback, NULL);
   if (EFI_ERROR(Status)) {
     return Status;
@@ -310,6 +485,15 @@ BuildHobFromBl (
     DEBUG ((DEBUG_INFO, "Create acpi board info guid hob\n"));
   }
 
+  //
+  // Parse memory info and build memory HOBs for reserved DRAM and MMIO
+  //
+  DEBUG ((DEBUG_INFO , "Building ResourceDescriptorHobs for reserved memory:\n"));
+  Status = ParseMemoryInfo (MemInfoCallbackMmio, &AcpiBoardInfo);
+  if (EFI_ERROR(Status)) {
+    return Status;
+  }
+
   //
   // Parse platform specific information.
   //
diff --git a/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.h b/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.h
index a4c9da128e..5a1b37be16 100644
--- a/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.h
+++ b/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.h
@@ -39,6 +39,16 @@
 #define GET_OCCUPIED_SIZE(ActualSize, Alignment) \
   ((ActualSize) + (((Alignment) - ((ActualSize) & ((Alignment) - 1))) & ((Alignment) - 1)))
 
+
+#define E820_RAM       1
+#define E820_RESERVED  2
+#define E820_ACPI      3
+#define E820_NVS       4
+#define E820_UNUSABLE  5
+#define E820_DISABLED  6
+#define E820_PMEM      7
+#define E820_UNDEFINED 8
+
 /**
   Auto-generated function that calls the library constructors for all of the module's
   dependent libraries.