diff --git a/src/cpu/intel/microcode/microcode.c b/src/cpu/intel/microcode/microcode.c
index 0d52baf..b2282264 100644
--- a/src/cpu/intel/microcode/microcode.c
+++ b/src/cpu/intel/microcode/microcode.c
@@ -241,6 +241,12 @@
 	static bool microcode_checked;
 	static const void *ucode_update;
 
+	if (ENV_CACHE_AS_RAM) {
+		printk(BIOS_ERR, "Microcode Error: Early microcode patching is not supported due"
+				"to NEM limitation\n");
+		return NULL;
+	}
+
 	if (microcode_checked)
 		return ucode_update;