Index: /trunk/src/VBox/Devices/Samples/DevPlayground.cpp
===================================================================
--- /trunk/src/VBox/Devices/Samples/DevPlayground.cpp	(revision 65290)
+++ /trunk/src/VBox/Devices/Samples/DevPlayground.cpp	(revision 65291)
@@ -177,5 +177,6 @@
         RTGCPHYS const cbFirst = iPciFun == 0 ? 8*_1G64 : iPciFun * _4K;
         rc = PDMDevHlpPCIIORegionRegisterEx(pDevIns, &pFun->PciDev, 0, cbFirst,
-                                            (PCIADDRESSSPACE)(PCI_ADDRESS_SPACE_MEM | PCI_ADDRESS_SPACE_BAR64),
+                                            (PCIADDRESSSPACE)(  PCI_ADDRESS_SPACE_MEM | PCI_ADDRESS_SPACE_BAR64
+                                                              | (iPciFun == 0 ? PCI_ADDRESS_SPACE_MEM_PREFETCH : 0)),
                                             devPlaygroundMap);
         AssertLogRelRCReturn(rc, rc);
@@ -190,5 +191,6 @@
         RTGCPHYS const cbSecond = iPciFun == 0  ? 256*_1G64 : iPciFun * _32K;
         rc = PDMDevHlpPCIIORegionRegisterEx(pDevIns, &pFun->PciDev, 2, cbSecond,
-                                            (PCIADDRESSSPACE)(PCI_ADDRESS_SPACE_MEM | PCI_ADDRESS_SPACE_BAR64),
+                                            (PCIADDRESSSPACE)(  PCI_ADDRESS_SPACE_MEM | PCI_ADDRESS_SPACE_BAR64
+                                                              | (iPciFun == 0 ? PCI_ADDRESS_SPACE_MEM_PREFETCH : 0)),
                                             devPlaygroundMap);
         AssertLogRelRCReturn(rc, rc);