diff --git a/src/mainboard/google/octopus/variants/bobba/Makefile.inc b/src/mainboard/google/octopus/variants/bobba/Makefile.inc
index 9fb63f5f43..152b46ece1 100644
--- a/src/mainboard/google/octopus/variants/bobba/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/bobba/Makefile.inc
@@ -1,3 +1,4 @@
 bootblock-y += gpio.c
 
 ramstage-y += gpio.c
+ramstage-y += mainboard.c
diff --git a/src/mainboard/google/octopus/variants/bobba/mainboard.c b/src/mainboard/google/octopus/variants/bobba/mainboard.c
new file mode 100644
index 0000000000..61098b7a34
--- /dev/null
+++ b/src/mainboard/google/octopus/variants/bobba/mainboard.c
@@ -0,0 +1,36 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <boardid.h>
+#include <ec/google/chromeec/ec.h>
+#include <sar.h>
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	const char *filename = NULL;
+	uint32_t sku_id;
+	if (google_chromeec_cbi_get_sku_id(&sku_id))
+		return NULL;
+
+	switch (sku_id) {
+	case 9:
+	case 10:
+	case 11:
+	case 12:
+		filename = "wifi_sar-bobba360.hex";
+		break;
+	}
+	return filename;
+}