diff --git a/src/mainboard/lenovo/t410/devicetree.cb b/src/mainboard/lenovo/t410/devicetree.cb
index af770dc01c..5f167df4b8 100644
--- a/src/mainboard/lenovo/t410/devicetree.cb
+++ b/src/mainboard/lenovo/t410/devicetree.cb
@@ -23,8 +23,6 @@ chip northbridge/intel/ironlake
 		end
 	end
 
-	register "pci_mmio_size" = "2048"
-
 	device domain 0 on
 		device pci 00.0 on # Host bridge
 			subsystemid 0x17aa 0x2193
diff --git a/src/mainboard/lenovo/x201/devicetree.cb b/src/mainboard/lenovo/x201/devicetree.cb
index 6b6543dee3..e142a1c692 100644
--- a/src/mainboard/lenovo/x201/devicetree.cb
+++ b/src/mainboard/lenovo/x201/devicetree.cb
@@ -24,8 +24,6 @@ chip northbridge/intel/ironlake
 		end
 	end
 
-	register "pci_mmio_size" = "1024"
-
 	device domain 0 on
 		device pci 00.0 on # Host bridge
 			subsystemid 0x17aa 0x2193
diff --git a/src/mainboard/packardbell/ms2290/devicetree.cb b/src/mainboard/packardbell/ms2290/devicetree.cb
index b57b3feba8..d5f96cba6e 100644
--- a/src/mainboard/packardbell/ms2290/devicetree.cb
+++ b/src/mainboard/packardbell/ms2290/devicetree.cb
@@ -24,8 +24,6 @@ chip northbridge/intel/ironlake
 		end
 	end
 
-	register "pci_mmio_size" = "2048"
-
 	device domain 0 on
 		device pci 00.0 on # Host bridge
 			subsystemid 0x1025 0x0379
diff --git a/src/northbridge/intel/ironlake/chip.h b/src/northbridge/intel/ironlake/chip.h
index b2976bced5..ab589ea221 100644
--- a/src/northbridge/intel/ironlake/chip.h
+++ b/src/northbridge/intel/ironlake/chip.h
@@ -34,11 +34,6 @@ struct northbridge_intel_ironlake_config {
 	u32 gpu_pch_backlight;	/* PCH Backlight PWM value */
 
 	struct i915_gpu_controller_info gfx;
-
-	/*
-	 * Maximum PCI mmio size in MiB.
-	 */
-	u16 pci_mmio_size;
 };
 
 #endif /* NORTHBRIDGE_INTEL_IRONLAKE_CHIP_H */
diff --git a/src/northbridge/intel/ironlake/raminit.c b/src/northbridge/intel/ironlake/raminit.c
index f073ddae89..34e56571ca 100644
--- a/src/northbridge/intel/ironlake/raminit.c
+++ b/src/northbridge/intel/ironlake/raminit.c
@@ -1273,23 +1273,6 @@ static void program_board_delay(struct raminfo *info)
 }
 
 #define DEFAULT_PCI_MMIO_SIZE 2048
-#define HOST_BRIDGE	PCI_DEVFN(0, 0)
-
-static unsigned int get_mmio_size(void)
-{
-	const struct device *dev;
-	const struct northbridge_intel_ironlake_config *cfg = NULL;
-
-	dev = pcidev_path_on_root(HOST_BRIDGE);
-	if (dev)
-		cfg = dev->chip_info;
-
-	/* If this is zero, it just means devicetree.cb didn't set it */
-	if (!cfg || cfg->pci_mmio_size == 0)
-		return DEFAULT_PCI_MMIO_SIZE;
-	else
-		return cfg->pci_mmio_size;
-}
 
 static void program_total_memory_map(struct raminfo *info)
 {
@@ -1323,7 +1306,7 @@ static void program_total_memory_map(struct raminfo *info)
 		uma_size_gtt = uma_sizes_gtt[(t >> 8) & 0xF];
 	}
 
-	mmio_size = get_mmio_size();
+	mmio_size = DEFAULT_PCI_MMIO_SIZE;
 
 	tom = info->total_memory_mb;
 	if (tom == 4096)