diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 7f4bea16202674bc60a1dbc49d25fd9d0461382e..1cf9c5b67f241f40f46b127024c4a659e95af221 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -514,7 +514,7 @@ static int add_system_ram_resources(void)
 			res->name = "System RAM";
 			res->start = base;
 			res->end = base + size - 1;
-			res->flags = IORESOURCE_MEM;
+			res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 			WARN_ON(request_resource(&iomem_resource, res) < 0);
 		}
 	}