diff --git a/src/northbridge/amd/amdfam10/Config.lb b/src/northbridge/amd/amdfam10/Config.lb
index 5e90819..79b7b49 100644
--- a/src/northbridge/amd/amdfam10/Config.lb
+++ b/src/northbridge/amd/amdfam10/Config.lb
@@ -19,8 +19,10 @@
 
 uses AGP_APERTURE_SIZE
 uses HAVE_ACPI_TABLES
+uses HAVE_HIGH_TABLES
 
 default AGP_APERTURE_SIZE=0x4000000
+default HAVE_HIGH_TABLES=1
 
 config chip.h
 
diff --git a/src/northbridge/amd/amdfam10/northbridge.c b/src/northbridge/amd/amdfam10/northbridge.c
index 92f9ea3..6a9504c 100644
--- a/src/northbridge/amd/amdfam10/northbridge.c
+++ b/src/northbridge/amd/amdfam10/northbridge.c
@@ -911,6 +911,11 @@
 
 #endif
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
+
 static void pci_domain_set_resources(device_t dev)
 {
 #if CONFIG_PCI_64BIT_PREF_MEM == 1
@@ -1084,6 +1089,15 @@
 					ram_resource(dev, (idx | i), basek, pre_sizek);
 					idx += 0x10;
 					sizek -= pre_sizek;
+#if HAVE_HIGH_TABLES==1
+					if (i==0 && high_tables_base==0) {
+					/* Leave some space for ACPI, PIRQ and MP tables */
+						high_tables_base = (mmio_basek - HIGH_TABLES_SIZE) * 1024;
+						high_tables_size = HIGH_TABLES_SIZE * 1024;
+						printk_debug("(split)%xK table at =%08llx\n", HIGH_TABLES_SIZE,
+							     high_tables_base);
+					}
+#endif
 				}
 				#if CONFIG_AMDMCT == 0
 				#if HW_MEM_HOLE_SIZEK != 0
@@ -1108,6 +1122,15 @@
 		}
 		ram_resource(dev, (idx | i), basek, sizek);
 		idx += 0x10;
+#if HAVE_HIGH_TABLES==1
+		printk_debug("%d: mmio_basek=%08lx, basek=%08x, limitk=%08x\n",
+			     i, mmio_basek, basek, limitk);
+		if (i==0 && high_tables_base==0) {
+		/* Leave some space for ACPI, PIRQ and MP tables */
+			high_tables_base = (limitk - HIGH_TABLES_SIZE) * 1024;
+			high_tables_size = HIGH_TABLES_SIZE * 1024;
+		}
+#endif
 	}
 
 	for(link = 0; link < dev->links; link++) {
diff --git a/src/northbridge/amd/gx1/Config.lb b/src/northbridge/amd/gx1/Config.lb
index 16463e0..adb96c3 100644
--- a/src/northbridge/amd/gx1/Config.lb
+++ b/src/northbridge/amd/gx1/Config.lb
@@ -1,2 +1,4 @@
+uses HAVE_HIGH_TABLES
 config chip.h
 driver northbridge.o
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/amd/gx1/northbridge.c b/src/northbridge/amd/gx1/northbridge.c
index 247c243..63cc003 100644
--- a/src/northbridge/amd/gx1/northbridge.c
+++ b/src/northbridge/amd/gx1/northbridge.c
@@ -126,6 +126,11 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
+
 static void pci_domain_set_resources(device_t dev)
 {
 	device_t mc_dev;
@@ -168,6 +173,13 @@
 			 */
 			tolmk = tomk;
 		}
+
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tolmk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
+
 		/* Report the memory regions */
 		idx = 10;
 		ram_resource(dev, idx++, 0, tolmk);
diff --git a/src/northbridge/amd/gx2/Config.lb b/src/northbridge/amd/gx2/Config.lb
index 4b361f5..342dac9 100644
--- a/src/northbridge/amd/gx2/Config.lb
+++ b/src/northbridge/amd/gx2/Config.lb
@@ -1,5 +1,7 @@
+uses HAVE_HIGH_TABLES
 config chip.h
 driver northbridge.o
 object northbridgeinit.o
 object chipsetinit.o
 object grphinit.o
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/amd/gx2/northbridge.c b/src/northbridge/amd/gx2/northbridge.c
index e285e52..bfcef1a 100644
--- a/src/northbridge/amd/gx2/northbridge.c
+++ b/src/northbridge/amd/gx2/northbridge.c
@@ -501,6 +501,11 @@
 
 void chipsetInit (void);
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
+
 static void enable_dev(struct device *dev)
 {
 	printk_debug("gx2 north: enable_dev\n");
@@ -512,6 +517,7 @@
         if (dev->path.type == DEVICE_PATH_PCI_DOMAIN) {
 		struct northbridge_amd_gx2_config *nb = (struct northbridge_amd_gx2_config *)dev->chip_info;
 		extern void cpubug(void);
+		u32 tomk;
 		printk_debug("DEVICE_PATH_PCI_DOMAIN\n");
 		/* cpubug MUST be called before setup_gx2(), so we force the issue here */
 		northbridgeinit();
@@ -524,7 +530,13 @@
 		graphics_init();
 		dev->ops = &pci_domain_ops;
 		pci_set_method(dev);
-		ram_resource(dev, 0, 0, ((sizeram() - VIDEO_MB) * 1024) - SMM_SIZE);
+		tomk = ((sizeram() - VIDEO_MB) * 1024) - SMM_SIZE;
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tomk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
+		ram_resource(dev, 0, 0, tomk);
         } else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) {
 		printk_debug("DEVICE_PATH_APIC_CLUSTER\n");
                 dev->ops = &cpu_bus_ops;
diff --git a/src/northbridge/amd/lx/Config.lb b/src/northbridge/amd/lx/Config.lb
index 9b1d4c2..b938889 100644
--- a/src/northbridge/amd/lx/Config.lb
+++ b/src/northbridge/amd/lx/Config.lb
@@ -1,4 +1,6 @@
+uses HAVE_HIGH_TABLES
 config chip.h
 driver northbridge.o
 object northbridgeinit.o
 object grphinit.o
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/amd/lx/northbridge.c b/src/northbridge/amd/lx/northbridge.c
index 9762510..390c94cf 100644
--- a/src/northbridge/amd/lx/northbridge.c
+++ b/src/northbridge/amd/lx/northbridge.c
@@ -415,19 +415,32 @@
 	    IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED;
 }
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
+
 static void pci_domain_set_resources(device_t dev)
 {
 	int idx;
+	u32 tomk;
 	device_t mc_dev;
 
 	printk_spew(">> Entering northbridge.c: %s\n", __func__);
 
 	mc_dev = dev->link[0].children;
 	if (mc_dev) {
+		tomk = get_systop() / 1024;
 		/* Report the memory regions */
 		idx = 10;
 		ram_resource(dev, idx++, 0, 640);
-		ram_resource(dev, idx++, 1024, (get_systop() - 0x100000) / 1024);	// Systop - 1 MB -> KB
+		ram_resource(dev, idx++, 1024, tomk - 1024);	// Systop - 1 MB -> KB
+
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tomk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
 	}
 
 	assign_resources(&dev->link[0]);
diff --git a/src/northbridge/intel/e7501/Config.lb b/src/northbridge/intel/e7501/Config.lb
index 59154f7..2a8095f 100644
--- a/src/northbridge/intel/e7501/Config.lb
+++ b/src/northbridge/intel/e7501/Config.lb
@@ -1,3 +1,7 @@
+uses HAVE_HIGH_TABLES
+
 config chip.h
 
 object northbridge.o
+
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/intel/e7501/northbridge.c b/src/northbridge/intel/e7501/northbridge.c
index b1d553a..7168bf3 100644
--- a/src/northbridge/intel/e7501/northbridge.c
+++ b/src/northbridge/intel/e7501/northbridge.c
@@ -65,6 +65,11 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
+
 static void pci_domain_set_resources(device_t dev)
 {
 	device_t mc_dev;
@@ -140,6 +145,12 @@
 			ram_resource(dev, idx++, remapbasek,
 				(remaplimitk + 64*1024) - remapbasek);
 		}
+
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tolmk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
 	}
 	assign_resources(&dev->link[0]);
 }
diff --git a/src/northbridge/intel/e7520/Config.lb b/src/northbridge/intel/e7520/Config.lb
index 064c867..03a7897 100644
--- a/src/northbridge/intel/e7520/Config.lb
+++ b/src/northbridge/intel/e7520/Config.lb
@@ -1,3 +1,5 @@
+uses HAVE_HIGH_TABLES
+
 config chip.h
 driver northbridge.o
 driver pciexp_porta.o
@@ -5,6 +7,8 @@
 driver pciexp_portb.o
 driver pciexp_portc.o
 
+default HAVE_HIGH_TABLES=1
+
 makerule raminit_test
 	depends "$(TOP)/src/northbridge/intel/e7520/raminit_test.c"
 	depends "$(TOP)/src/northbridge/intel/e7520/raminit.c"
diff --git a/src/northbridge/intel/e7520/northbridge.c b/src/northbridge/intel/e7520/northbridge.c
index ad44c9b..f2b2a0f 100644
--- a/src/northbridge/intel/e7520/northbridge.c
+++ b/src/northbridge/intel/e7520/northbridge.c
@@ -76,6 +76,10 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
 
 static void pci_domain_set_resources(device_t dev)
 {
@@ -164,6 +168,12 @@
 			ram_resource(dev, 6, remapbasek, 
 				(remaplimitk + 64*1024) - remapbasek);
 		}
+
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tolmk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
 	}
 	assign_resources(&dev->link[0]);
 }
diff --git a/src/northbridge/intel/e7525/Config.lb b/src/northbridge/intel/e7525/Config.lb
index 919e0f8..07930ff 100644
--- a/src/northbridge/intel/e7525/Config.lb
+++ b/src/northbridge/intel/e7525/Config.lb
@@ -1,3 +1,5 @@
+uses HAVE_HIGH_TABLES
+
 config chip.h
 driver northbridge.o
 driver pciexp_porta.o
@@ -5,6 +7,8 @@
 driver pciexp_portb.o
 driver pciexp_portc.o
 
+default HAVE_HIGH_TABLES=1
+
 makerule raminit_test
 	depends "$(TOP)/src/northbridge/intel/e7525/raminit_test.c"
 	depends "$(TOP)/src/northbridge/intel/e7525/raminit.c"
diff --git a/src/northbridge/intel/e7525/northbridge.c b/src/northbridge/intel/e7525/northbridge.c
index 2ed8922..7900129 100644
--- a/src/northbridge/intel/e7525/northbridge.c
+++ b/src/northbridge/intel/e7525/northbridge.c
@@ -76,6 +76,10 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
 
 static void pci_domain_set_resources(device_t dev)
 {
@@ -164,6 +168,12 @@
 			ram_resource(dev, 6, remapbasek, 
 				(remaplimitk + 64*1024) - remapbasek);
 		}
+
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tolmk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
 	}
 	assign_resources(&dev->link[0]);
 }
diff --git a/src/northbridge/intel/i3100/Config.lb b/src/northbridge/intel/i3100/Config.lb
index ea4c8eb..1534605 100644
--- a/src/northbridge/intel/i3100/Config.lb
+++ b/src/northbridge/intel/i3100/Config.lb
@@ -17,6 +17,11 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 ##
 
+uses HAVE_HIGH_TABLES
+
 config chip.h
+
 driver northbridge.o
 driver pciexp_porta.o
+
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/intel/i3100/northbridge.c b/src/northbridge/intel/i3100/northbridge.c
index d36af7c..928fe94 100644
--- a/src/northbridge/intel/i3100/northbridge.c
+++ b/src/northbridge/intel/i3100/northbridge.c
@@ -97,6 +97,10 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
 
 static void pci_domain_set_resources(device_t dev)
 {
@@ -185,6 +189,12 @@
 			ram_resource(dev, 6, remapbasek,
 				(remaplimitk + 64*1024) - remapbasek);
 		}
+
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tolmk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
 	}
 	assign_resources(&dev->link[0]);
 }
diff --git a/src/northbridge/intel/i440bx/Config.lb b/src/northbridge/intel/i440bx/Config.lb
index 82a05ee..c9a26b0 100644
--- a/src/northbridge/intel/i440bx/Config.lb
+++ b/src/northbridge/intel/i440bx/Config.lb
@@ -18,5 +18,10 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 ##
 
+uses HAVE_HIGH_TABLES
+
 config chip.h
+
 driver northbridge.o
+
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/intel/i440bx/northbridge.c b/src/northbridge/intel/i440bx/northbridge.c
index 306e73e..f95a1a7 100644
--- a/src/northbridge/intel/i440bx/northbridge.c
+++ b/src/northbridge/intel/i440bx/northbridge.c
@@ -91,6 +91,10 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
 static void pci_domain_set_resources(device_t dev)
 {
 	device_t mc_dev;
@@ -127,6 +131,12 @@
 		idx = 10;
 		ram_resource(dev, idx++, 0, 640);
 		ram_resource(dev, idx++, 768, tolmk - 768);
+ 
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tomk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
 	}
 
 	assign_resources(&dev->link[0]);
diff --git a/src/northbridge/intel/i82810/Config.lb b/src/northbridge/intel/i82810/Config.lb
index e8d57b2..04375d8 100644
--- a/src/northbridge/intel/i82810/Config.lb
+++ b/src/northbridge/intel/i82810/Config.lb
@@ -18,5 +18,10 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 ##
 
+uses HAVE_HIGH_TABLES
+
 config chip.h
+
 driver northbridge.o
+
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/intel/i82810/northbridge.c b/src/northbridge/intel/i82810/northbridge.c
index eb8a657..bfbd338 100644
--- a/src/northbridge/intel/i82810/northbridge.c
+++ b/src/northbridge/intel/i82810/northbridge.c
@@ -122,6 +122,11 @@
 /* MB */0, 8, 0, 16, 16, 24, 32, 32, 48, 64, 64, 96, 128, 128, 192, 256,
 };
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
+
 static void pci_domain_set_resources(device_t dev)
 {
 	device_t mc_dev;
@@ -166,6 +171,12 @@
 		idx = 10;
 		ram_resource(dev, idx++, 0, 640);
 		ram_resource(dev, idx++, 1024, tolmk - 1024);
+
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tomk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
 	}
 	assign_resources(&dev->link[0]);
 }
diff --git a/src/northbridge/intel/i82830/Config.lb b/src/northbridge/intel/i82830/Config.lb
index d2ccd5d..f55eab2 100644
--- a/src/northbridge/intel/i82830/Config.lb
+++ b/src/northbridge/intel/i82830/Config.lb
@@ -18,5 +18,10 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 ##
 
+uses HAVE_HIGH_TABLES
+
 config chip.h
+
 driver northbridge.o
+
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/intel/i82830/northbridge.c b/src/northbridge/intel/i82830/northbridge.c
index 689bf19..bf79ecd 100644
--- a/src/northbridge/intel/i82830/northbridge.c
+++ b/src/northbridge/intel/i82830/northbridge.c
@@ -107,6 +107,10 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
 static void pci_domain_set_resources(device_t dev)
 {
 	device_t mc_dev;
@@ -144,6 +148,12 @@
 		idx = 10;
 		ram_resource(dev, idx++, 0, 640);
 		ram_resource(dev, idx++, 1024, tolmk - 1024);
+
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tomk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
 	}
 	assign_resources(&dev->link[0]);
 }
diff --git a/src/northbridge/intel/i855gme/Config.lb b/src/northbridge/intel/i855gme/Config.lb
index 5a7cd14..83edd47 100644
--- a/src/northbridge/intel/i855gme/Config.lb
+++ b/src/northbridge/intel/i855gme/Config.lb
@@ -18,7 +18,10 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
-config chip.h
-object northbridge.o
-#driver misc_control.o
+uses HAVE_HIGH_TABLES
 
+config chip.h
+
+object northbridge.o
+
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/intel/i855gme/northbridge.c b/src/northbridge/intel/i855gme/northbridge.c
index e5fecf1..ec42c6e 100644
--- a/src/northbridge/intel/i855gme/northbridge.c
+++ b/src/northbridge/intel/i855gme/northbridge.c
@@ -88,6 +88,10 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
 static void pci_domain_set_resources(device_t dev)
 {
 	device_t mc_dev;
@@ -143,6 +147,11 @@
 		/* ram_resource(dev, idx++, 1024, tolmk - 1024); */
 		ram_resource(dev, idx++, 768, tolmk - 768);
 
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tomk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
 	}
 	assign_resources(&dev->link[0]);
 }
diff --git a/src/northbridge/intel/i855pm/Config.lb b/src/northbridge/intel/i855pm/Config.lb
index f101a92..2a8095f 100644
--- a/src/northbridge/intel/i855pm/Config.lb
+++ b/src/northbridge/intel/i855pm/Config.lb
@@ -1,4 +1,7 @@
-config chip.h
-object northbridge.o
-#driver misc_control.o
+uses HAVE_HIGH_TABLES
 
+config chip.h
+
+object northbridge.o
+
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/intel/i855pm/northbridge.c b/src/northbridge/intel/i855pm/northbridge.c
index 6064854..4fbd3b3 100644
--- a/src/northbridge/intel/i855pm/northbridge.c
+++ b/src/northbridge/intel/i855pm/northbridge.c
@@ -66,6 +66,11 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
+
 static void pci_domain_set_resources(device_t dev)
 {
 	device_t mc_dev;
@@ -108,6 +113,12 @@
 		idx = 10;
 		ram_resource(dev, idx++, 0, 640);
 		ram_resource(dev, idx++, 768, tolmk - 768);
+
+#if HAVE_HIGH_TABLES==1
+		/* Leave some space for ACPI, PIRQ and MP tables */
+		high_tables_base = (tomk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
 	}
 	assign_resources(&dev->link[0]);
 }
diff --git a/src/northbridge/via/cn700/Config.lb b/src/northbridge/via/cn700/Config.lb
index 6a0b60c..b824a17 100644
--- a/src/northbridge/via/cn700/Config.lb
+++ b/src/northbridge/via/cn700/Config.lb
@@ -18,8 +18,14 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 ##
 
+uses HAVE_HIGH_TABLES
+
 config chip.h
+
 object vgabios.o
+
 driver northbridge.o
 driver agp.o
 driver vga.o
+
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/via/cn700/northbridge.c b/src/northbridge/via/cn700/northbridge.c
index af91452..2d3adf1 100644
--- a/src/northbridge/via/cn700/northbridge.c
+++ b/src/northbridge/via/cn700/northbridge.c
@@ -163,6 +163,12 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+/* maximum size of high tables in KB */
+#define HIGH_TABLES_SIZE 64
+extern uint64_t high_tables_base, high_tables_size;
+#endif
+
 static void pci_domain_set_resources(device_t dev)
 {
 	/* The order is important to find the correct RAM size. */
@@ -199,6 +205,13 @@
 			/* The PCI hole does does not overlap the memory. */
 			tolmk = tomk;
 		}
+
+#if HAVE_HIGH_TABLES == 1
+		high_tables_base = (tolmk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE* 1024;
+		printk_debug("tom: %lx, high_tables_base: %llx, high_tables_size: %llx\n", tomk*1024, high_tables_base, high_tables_size);
+#endif
+
 		/* Report the memory regions. */
 		idx = 10;
 		/* TODO: Hole needed? */
diff --git a/src/northbridge/via/cx700/northbridge.c b/src/northbridge/via/cx700/northbridge.c
index 11c98da..c7bbb8b 100644
--- a/src/northbridge/via/cx700/northbridge.c
+++ b/src/northbridge/via/cx700/northbridge.c
@@ -123,12 +123,6 @@
 	else
 		tomk = (((rambits << 6) - (4 << reg) - 1) * 1024);
 
-#if HAVE_HIGH_TABLES == 1
-	high_tables_base = (tomk - HIGH_TABLES_SIZE) * 1024;
-	high_tables_size = HIGH_TABLES_SIZE* 1024;
-	printk_debug("tom: %lx, high_tables_base: %llx, high_tables_size: %llx\n", tomk*1024, high_tables_base, high_tables_size);
-#endif
-
 	/* Compute the top of Low memory */
 	tolmk = pci_tolm >> 10;
 	if (tolmk >= tomk) {
@@ -137,6 +131,12 @@
 		tolmk -= 1024;	// TOP 1M SM Memory
 	}
 
+#if HAVE_HIGH_TABLES == 1
+	high_tables_base = (tolmk - HIGH_TABLES_SIZE) * 1024;
+	high_tables_size = HIGH_TABLES_SIZE* 1024;
+	printk_debug("tom: %lx, high_tables_base: %llx, high_tables_size: %llx\n", tomk*1024, high_tables_base, high_tables_size);
+#endif
+
 	/* Report the memory regions */
 	idx = 10;
 
diff --git a/src/northbridge/via/vt8601/Config.lb b/src/northbridge/via/vt8601/Config.lb
index 16463e0..9cf0154 100644
--- a/src/northbridge/via/vt8601/Config.lb
+++ b/src/northbridge/via/vt8601/Config.lb
@@ -1,2 +1,7 @@
+uses HAVE_HIGH_TABLES
+
 config chip.h
+
 driver northbridge.o
+
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/via/vt8601/northbridge.c b/src/northbridge/via/vt8601/northbridge.c
index 5347017..b1e1c49 100644
--- a/src/northbridge/via/vt8601/northbridge.c
+++ b/src/northbridge/via/vt8601/northbridge.c
@@ -101,6 +101,12 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+/* maximum size of high tables in KB */
+#define HIGH_TABLES_SIZE 64
+extern uint64_t high_tables_base, high_tables_size;
+#endif
+
 static void pci_domain_set_resources(device_t dev)
 {
 	static const uint8_t ramregs[] = {
@@ -140,6 +146,13 @@
 			 */
 			tolmk = tomk;
 		}
+
+#if HAVE_HIGH_TABLES == 1
+		high_tables_base = (tolmk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE* 1024;
+		printk_debug("tom: %lx, high_tables_base: %llx, high_tables_size: %llx\n", tomk*1024, high_tables_base, high_tables_size);
+#endif
+
 		/* Report the memory regions */
 		idx = 10;
 		ram_resource(dev, idx++, 0, tolmk);
diff --git a/src/northbridge/via/vt8623/Config.lb b/src/northbridge/via/vt8623/Config.lb
index 16463e0..9cf0154 100644
--- a/src/northbridge/via/vt8623/Config.lb
+++ b/src/northbridge/via/vt8623/Config.lb
@@ -1,2 +1,7 @@
+uses HAVE_HIGH_TABLES
+
 config chip.h
+
 driver northbridge.o
+
+default HAVE_HIGH_TABLES=1
diff --git a/src/northbridge/via/vt8623/northbridge.c b/src/northbridge/via/vt8623/northbridge.c
index 80a314c..70ba59c 100644
--- a/src/northbridge/via/vt8623/northbridge.c
+++ b/src/northbridge/via/vt8623/northbridge.c
@@ -15,25 +15,11 @@
 #include "northbridge.h"
 
 /*
- * This fixup is based on capturing values from an Award bios.  Without
+ * This fixup is based on capturing values from an Award BIOS.  Without
  * this fixup the DMA write performance is awful (i.e. hdparm -t /dev/hda is 20x
  * slower than normal, ethernet drops packets).
  * Apparently these registers govern some sort of bus master behavior.
  */
-#if 0
-static void dump_dev(device_t dev)
-{
-	int i,j;
-	
-	for(i = 0; i < 256; i += 16) {
-		printk_debug("0x%x: ", i);
-		for(j = 0; j < 16; j++) {
-			printk_debug("%02x ", pci_read_config8(dev, i+j));
-		}
-		printk_debug("\n");
-	}
-}
-#endif
 
 static void northbridge_init(device_t dev) 
 {
@@ -72,7 +58,6 @@
 		pci_write_config8(dev, 0xe0, c);
 		pci_write_config8(dev, 0xe2, 0x42);      /* 'cos award does */
 	}
-	//dump_dev(dev);
 }
 
 static void nullfunc(){}
@@ -100,7 +85,6 @@
 	pci_write_config8(dev, 0x43, 0x44);
 	pci_write_config8(dev, 0x44, 0x34);
 	pci_write_config8(dev, 0x83, 0x02);
-	//dump_dev(dev);
 }
 
 static struct device_operations agp_operations = {
@@ -129,8 +113,6 @@
 	pci_write_config32(dev,0x10,0xd8000008);
 	pci_write_config32(dev,0x14,0xdc000000);
 
-	//dump_dev(dev);
-	
 	// set up performnce counters for debugging vga init sequence
 	//setup.lo = 0x1c0; // count instructions
 	//wrmsr(0x187,setup);
@@ -175,7 +157,6 @@
 	
 #endif
 
-
 	pci_write_config32(dev,0x30,0);
 
 	/* Set the vga mtrrs - disable for the moment as the add_var_mtrr function has vapourised */
@@ -272,6 +253,12 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+/* maximum size of high tables in KB */
+#define HIGH_TABLES_SIZE 64
+extern uint64_t high_tables_base, high_tables_size;
+#endif
+
 static void pci_domain_set_resources(device_t dev)
 {
 	static const uint8_t ramregs[] = {0x5a, 0x5b, 0x5c, 0x5d };
@@ -311,6 +298,13 @@
 			 */
 			tolmk = tomk;
 		}
+
+#if HAVE_HIGH_TABLES == 1
+		high_tables_base = (tolmk - HIGH_TABLES_SIZE) * 1024;
+		high_tables_size = HIGH_TABLES_SIZE* 1024;
+		printk_debug("tom: %lx, high_tables_base: %llx, high_tables_size: %llx\n", tomk*1024, high_tables_base, high_tables_size);
+#endif
+
 		/* Report the memory regions */
 		idx = 10;
 		ram_resource(dev, idx++, 0, 640);		/* first 640k */