diff --git a/board/sysam/stmark2/Kconfig b/board/sysam/stmark2/Kconfig
index 49d0274..b259505 100644
--- a/board/sysam/stmark2/Kconfig
+++ b/board/sysam/stmark2/Kconfig
@@ -6,6 +6,10 @@
 config EXTRA_CLOCK
 	def_bool y
 
+config SERIAL_BOOT
+	def_bool y
+	depends on CF_SBF
+
 config SYS_INPUT_CLKSRC
 	hex
 	default 30000000