diff --git a/sys/ia64/ia64/machdep.c b/sys/ia64/ia64/machdep.c
index fdd3adc892a8..ae5612ae1068 100644
--- a/sys/ia64/ia64/machdep.c
+++ b/sys/ia64/ia64/machdep.c
@@ -570,6 +570,21 @@ ia64_init(u_int64_t arg1, u_int64_t arg2)
 		if (mdp->Type != EfiConventionalMemory)
 			continue;
 
+		/*
+		 * Wimp out for now since we do not DTRT here with
+		 * pci bus mastering (no bounce buffering, for example).
+		 */
+		if (pfn0 >= ia64_btop(0x100000000UL)) {
+			printf("Skipping memory chunk start 0x%lx\n",
+			    mdp->PhysicalStart);
+			continue;
+		}
+		if (pfn1 >= ia64_btop(0x100000000UL)) {
+			printf("Skipping memory chunk end 0x%lx\n",
+			    mdp->PhysicalStart + mdp->NumberOfPages * 4096);
+			continue;
+		}
+
 		/*
 		 * We have a memory descriptor that describes conventional
 		 * memory that is for general use. We must determine if the