diff --git a/src/soc/intel/baytrail/northcluster.c b/src/soc/intel/baytrail/northcluster.c
index 6052477..3df3713 100644
--- a/src/soc/intel/baytrail/northcluster.c
+++ b/src/soc/intel/baytrail/northcluster.c
@@ -28,6 +28,7 @@
 #include <baytrail/iosf.h>
 #include <baytrail/pci_devs.h>
 #include <baytrail/ramstage.h>
+#include <stddef.h>
 
 /* Host Memory Map:
  *
@@ -68,7 +69,14 @@
 
 uint32_t nc_read_top_of_low_memory(void)
 {
-	return iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1);
+	MAYBE_STATIC uint32_t tolm = 0;
+
+	if (tolm)
+		return tolm;
+
+	tolm = iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1);
+
+	return tolm;
 }
 
 static void nc_read_resources(device_t dev)