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diff --git a/Platform/Intel/PurleyOpenBoardPkg/Acpi/BoardAcpiDxe/Dsdt/HostBus.asl b/Platform/Intel/PurleyOpenBoardPkg/Acpi/BoardAcpiDxe/Dsdt/HostBus.asl
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+/** @file
+
+Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials are licensed and made available under
+the terms and conditions of the BSD License that accompanies this distribution.
+The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php.
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+//
+// Define various System Agent (SA) PCI Configuration Space
+// registers which will be used to dynamically produce all
+// resources in the Host Bus _CRS.
+//
+OperationRegion (HBUS, PCI_Config, 0x00, 0x100)
+Field (HBUS, DWordAcc, NoLock, Preserve)
+{
+ Offset(0x40), // EPBAR (0:0:0:40)
+ EPEN, 1, // Enable
+ , 11,
+ EPBR, 20, // EPBAR [31:12]
+
+ Offset(0x48), // MCHBAR (0:0:0:48)
+ MHEN, 1, // Enable
+ , 14,
+ MHBR, 17, // MCHBAR [31:15]
+
+ Offset(0x50), // GGC (0:0:0:50)
+ GCLK, 1, // GGCLCK
+
+ Offset(0x54), // DEVEN (0:0:0:54)
+ D0EN, 1, // DEV0 Enable
+ D1F2, 1, // DEV1 FUN2 Enable
+ D1F1, 1, // DEV1 FUN1 Enable
+ D1F0, 1, // DEV1 FUN0 Enable
+
+ Offset(0x60), // PCIEXBAR (0:0:0:60)
+ PXEN, 1, // Enable
+ PXSZ, 2, // PCI Express Size
+ , 23,
+ PXBR, 6, // PCI Express BAR [31:26]
+
+ Offset(0x68), // DMIBAR (0:0:0:68)
+ DIEN, 1, // Enable
+ , 11,
+ DIBR, 20, // DMIBAR [31:12]
+
+ Offset(0x70), // MESEG_BASE (0:0:0:70)
+ , 20,
+ MEBR, 12, // MESEG_BASE [31:20]
+
+ Offset(0x80), // PAM0 Register (0:0:0:80)
+ , 4,
+ PM0H, 2, // PAM 0, High Nibble
+ , 2,
+
+ Offset(0x81), // PAM1 Register (0:0:0:81)
+ PM1L, 2, // PAM1, Low Nibble
+ , 2,
+ PM1H, 2, // PAM1, High Nibble
+ , 2,
+
+ Offset(0x82), // PAM2 Register (0:0:0:82)
+ PM2L, 2, // PAM2, Low Nibble
+ , 2,
+ PM2H, 2, // PAM2, High Nibble
+ , 2,
+
+ Offset(0x83), // PAM3 Register (0:0:0:83)
+ PM3L, 2, // PAM3, Low Nibble
+ , 2,
+ PM3H, 2, // PAM3, High Nibble
+ , 2,
+
+ Offset(0x84), // PAM4 Register (0:0:0:84)
+ PM4L, 2, // PAM4, Low Nibble
+ , 2,
+ PM4H, 2, // PAM4, High Nibble
+ , 2,
+
+ Offset(0x85), // PAM5 Register (0:0:0:85)
+ PM5L, 2, // PAM5, Low Nibble
+ , 2,
+ PM5H, 2, // PAM5, High Nibble
+ , 2,
+
+ Offset(0x86), // PAM6 Register (0:0:0:86)
+ PM6L, 2, // PAM6, Low Nibble
+ , 2,
+ PM6H, 2, // PAM6, High Nibble
+ , 2,
+
+ Offset(0xA8), // Top of Upper Usable DRAM Register (0:0:0:A8)
+ , 20,
+ TUUD, 19, // TOUUD [38:20]
+
+ Offset(0xBC), // Top of Lower Usable DRAM Register (0:0:0:BC)
+ , 20,
+ TLUD, 12, // TOLUD [31:20]
+
+ Offset(0xC8), // ERRSTS register (0:0:0:C8)
+ , 7,
+ HTSE, 1 // Host Thermal Sensor Event for SMI/SCI/SERR
+}
+//
+// Define a buffer that will store all the bus, memory, and IO information
+// relating to the Host Bus. This buffer will be dynamically altered in
+// the _CRS and passed back to the OS.
+//
+Name(BUF0,ResourceTemplate()
+{
+ //
+ // Bus Number Allocation: Bus 0 to 0xFF
+ //
+ WORDBusNumber(ResourceProducer,MinFixed,MaxFixed,PosDecode,0x00,
+ 0x0000,0x00FF,0x00,0x0100,,,PB00)
+
+ //
+ // I/O Region Allocation 0 ( 0x0000 - 0x0CF7 )
+ //
+ DWordIo(ResourceProducer,MinFixed,MaxFixed,PosDecode,EntireRange,
+ 0x00,0x0000,0x0CF7,0x00,0x0CF8,,,PI00)
+
+ //
+ // PCI Configuration Registers ( 0x0CF8 - 0x0CFF )
+ //
+ Io(Decode16,0x0CF8,0x0CF8,1,0x08)
+
+ //
+ // I/O Region Allocation 1 ( 0x0D00 - 0xFFFF )
+ //
+ DWordIo(ResourceProducer,MinFixed,MaxFixed,PosDecode,EntireRange,
+ 0x00,0x0D00,0xFFFF,0x00,0xF300,,,PI01)
+
+ //
+ // Video Buffer Area ( 0xA0000 - 0xBFFFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xA0000,0xBFFFF,0x00,0x20000,,,A000)
+
+ //
+ // ISA Add-on BIOS Area ( 0xC0000 - 0xC3FFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xC0000,0xC3FFF,0x00,0x4000,,,C000)
+
+ //
+ // ISA Add-on BIOS Area ( 0xC4000 - 0xC7FFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xC4000,0xC7FFF,0x00,0x4000,,,C400)
+
+ //
+ // ISA Add-on BIOS Area ( 0xC8000 - 0xCBFFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xC8000,0xCBFFF,0x00,0x4000,,,C800)
+
+ //
+ // ISA Add-on BIOS Area ( 0xCC000 - 0xCFFFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xCC000,0xCFFFF,0x00,0x4000,,,CC00)
+
+ //
+ // ISA Add-on BIOS Area ( 0xD0000 - 0xD3FFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xD0000,0xD3FFF,0x00,0x4000,,,D000)
+
+ //
+ // ISA Add-on BIOS Area ( 0xD4000 - 0xD7FFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xD4000,0xD7FFF,0x00,0x4000,,,D400)
+
+ //
+ // ISA Add-on BIOS Area ( 0xD8000 - 0xDBFFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xD8000,0xDBFFF,0x00,0x4000,,,D800)
+
+ //
+ // ISA Add-on BIOS Area ( 0xDC000 - 0xDFFFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xDC000,0xDFFFF,0x00,0x4000,,,DC00)
+
+ //
+ // BIOS Extension Area ( 0xE0000 - 0xE3FFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xE0000,0xE3FFF,0x00,0x4000,,,E000)
+
+ //
+ // BIOS Extension Area ( 0xE4000 - 0xE7FFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xE4000,0xE7FFF,0x00,0x4000,,,E400)
+
+ //
+ // BIOS Extension Area ( 0xE8000 - 0xEBFFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xE8000,0xEBFFF,0x00,0x4000,,,E800)
+
+ //
+ // BIOS Extension Area ( 0xEC000 - 0xEFFFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xEC000,0xEFFFF,0x00,0x4000,,,EC00)
+
+ //
+ // BIOS Area ( 0xF0000 - 0xFFFFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0xF0000,0xFFFFF,0x00,0x10000,,,F000)
+
+// //
+// // Memory Hole Region ( 0xF00000 - 0xFFFFFF )
+// //
+// DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+// ReadWrite,0x00,0xF00000,0xFFFFFF,0x00,0x100000,,,HOLE)
+
+ //
+ // PCI Memory Region ( TOLUD - 0xFEAFFFFF )
+ //
+ DWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0x00000000,0xFEAFFFFF,0x00,0xFEB00000,,,PM01)
+
+ //
+ // PCI Memory Region ( TOUUD - (TOUUD + ABOVE_4G_MMIO_SIZE) )
+ // (This is dummy range for OS compatibility, will patch it in _CRS)
+ //
+ QWordMemory(ResourceProducer,PosDecode,MinFixed,MaxFixed,Cacheable,
+ ReadWrite,0x00,0x10000,0x1FFFF,0x00,0x10000,,,PM02)
+})
+
+Name(EP_B, 0) // to store EP BAR
+Name(MH_B, 0) // to store MCH BAR
+Name(PC_B, 0) // to store PCIe BAR
+Name(PC_L, 0) // to store PCIe BAR Length
+Name(DM_B, 0) // to store DMI BAR
+
+
+//
+// Get PCIe BAR
+//
+Method(GPCB,0,Serialized)
+{
+ if(LEqual(PC_B,0))
+ {
+ //ShiftLeft(\_SB.PC00.PXBR,26,PC_B)
+ Store(MCFG,PC_B)
+ }
+ Return(PC_B)
+}
+
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