diff --git a/arch/arm/dts/armada-37xx.dtsi b/arch/arm/dts/armada-37xx.dtsi
index b7d325b405..2615b8c748 100644
--- a/arch/arm/dts/armada-37xx.dtsi
+++ b/arch/arm/dts/armada-37xx.dtsi
@@ -332,10 +332,17 @@
 			status = "disabled";
 
 			bus-range = <0 0xff>;
+			/*
+			 * The 128 MiB address range [0xe8000000-0xf0000000] is
+			 * dedicated for PCIe and can be assigned to 8 windows
+			 * with size a power of two. Use one 64 KiB window for
+			 * IO at the end and the remaining seven windows
+			 * (totaling 127 MiB) for MEM.
+			 */
 			ranges = <0x82000000 0 0xe8000000
-				 0 0xe8000000 0 0x1000000 /* Port 0 MEM */
-				 0x81000000 0 0xe9000000
-				 0 0xe9000000 0 0x10000>; /* Port 0 IO*/
+				 0 0xe8000000 0 0x7f00000 /* Port 0 MEM */
+				 0x81000000 0 0xefff0000
+				 0 0xefff0000 0 0x10000>; /* Port 0 IO*/
 		};
 	};
 };