diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 90e828a..928fc60 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -356,4 +356,18 @@
 
 source "board/intel/crownbay/Kconfig"
 
+config PCIE_ECAM_BASE
+	hex
+    default 0xe0000000
+	help
+	  This is the memory-mapped address of PCI configuration space, which
+	  is only available through the Enhanced Configuration Access
+	  Mechanism (ECAM) with PCI Express. It can be set up almost
+	  anywhere. Before it is set up, it is possible to access PCI
+	  configuration space through I/O access, but memory access is more
+	  convenient. Using this, PCI can be scanned and configured. This
+	  should be set to a region that does not conflict with memory
+	  assigned to PCI devices - i.e. the memory and prefetch regions, as
+	  passed to pci_set_region().
+
 endmenu
diff --git a/arch/x86/cpu/ivybridge/sdram.c b/arch/x86/cpu/ivybridge/sdram.c
index 4963448..766b385 100644
--- a/arch/x86/cpu/ivybridge/sdram.c
+++ b/arch/x86/cpu/ivybridge/sdram.c
@@ -757,7 +757,7 @@
 		.mchbar = DEFAULT_MCHBAR,
 		.dmibar = DEFAULT_DMIBAR,
 		.epbar = DEFAULT_EPBAR,
-		.pciexbar = CONFIG_MMCONF_BASE_ADDRESS,
+		.pciexbar = CONFIG_PCIE_ECAM_BASE,
 		.smbusbar = SMBUS_IO_BASE,
 		.wdbbar = 0x4000000,
 		.wdbsize = 0x1000,
diff --git a/arch/x86/include/asm/arch-ivybridge/sandybridge.h b/arch/x86/include/asm/arch-ivybridge/sandybridge.h
index cf7457f..c960525 100644
--- a/arch/x86/include/asm/arch-ivybridge/sandybridge.h
+++ b/arch/x86/include/asm/arch-ivybridge/sandybridge.h
@@ -43,7 +43,7 @@
 #define DEFAULT_EPBAR		0xfed19000	/* 4 KB */
 #define DEFAULT_RCBABASE	0xfed1c000
 /* 4 KB per PCIe device */
-#define DEFAULT_PCIEXBAR	CONFIG_MMCONF_BASE_ADDRESS
+#define DEFAULT_PCIEXBAR	CONFIG_PCIE_ECAM_BASE
 
 /* Device 0:0.0 PCI configuration space (Host Bridge) */
 #define EPBAR		0x40