diff --git a/tools/firmware/etherboot/Config b/tools/firmware/etherboot/Config
index 5ce08bb903..143914f135 100644
--- a/tools/firmware/etherboot/Config
+++ b/tools/firmware/etherboot/Config
@@ -6,3 +6,6 @@ CFLAGS += -DPXE_DHCP_STRICT
 
 CFLAGS += -UNO_POST_PROMPT
 CFLAGS += -DNO_POST_PROMPT
+
+CFLAGS += -UCONSOLE_SERIAL
+CFLAGS += -DCONSOLE_SERIAL=1