diff --git a/src/mainboard/google/skywalker/Kconfig b/src/mainboard/google/skywalker/Kconfig
index a3bed903b2..b3da5482b2 100644
--- a/src/mainboard/google/skywalker/Kconfig
+++ b/src/mainboard/google/skywalker/Kconfig
@@ -27,4 +27,8 @@ config MAINBOARD_DIR
 config MAINBOARD_PART_NUMBER
 	string
 	default "Skywalker" if BOARD_GOOGLE_SKYWALKER
+
+config BOOT_DEVICE_SPI_FLASH_BUS
+	int
+	default 7
 endif
diff --git a/src/mainboard/google/skywalker/bootblock.c b/src/mainboard/google/skywalker/bootblock.c
index af9934e07e..1062d9bbe5 100644
--- a/src/mainboard/google/skywalker/bootblock.c
+++ b/src/mainboard/google/skywalker/bootblock.c
@@ -1,8 +1,9 @@
 /* SPDX-License-Identifier: GPL-2.0-only OR MIT */
 
 #include <bootblock_common.h>
+#include <soc/spi.h>
 
 void bootblock_mainboard_init(void)
 {
-	/* TODO: add mainboard init for bootblock */
+	mtk_snfc_init();
 }