diff --git a/src/mainboard/google/dedede/Kconfig.name b/src/mainboard/google/dedede/Kconfig.name
index bc31ea5e1c..7a5372140c 100644
--- a/src/mainboard/google/dedede/Kconfig.name
+++ b/src/mainboard/google/dedede/Kconfig.name
@@ -34,6 +34,7 @@ config BOARD_GOOGLE_MADOO
 	select BOARD_GOOGLE_BASEBOARD_DEDEDE
 	select BASEBOARD_DEDEDE_LAPTOP
 	select DRIVERS_GENERIC_MAX98357A
+	select GEO_SAR_ENABLE if CHROMEOS_WIFI_SAR
 
 config BOARD_GOOGLE_WADDLEDOO
 	bool "Waddledoo"
diff --git a/src/mainboard/google/dedede/variants/madoo/Makefile.inc b/src/mainboard/google/dedede/variants/madoo/Makefile.inc
index eb2c9bc021..04eb9a4877 100644
--- a/src/mainboard/google/dedede/variants/madoo/Makefile.inc
+++ b/src/mainboard/google/dedede/variants/madoo/Makefile.inc
@@ -1,3 +1,4 @@
 ## SPDX-License-Identifier: GPL-2.0-or-later
 
 ramstage-y += gpio.c
+ramstage-$(CONFIG_FW_CONFIG) += variant.c
diff --git a/src/mainboard/google/dedede/variants/madoo/variant.c b/src/mainboard/google/dedede/variants/madoo/variant.c
new file mode 100644
index 0000000000..b8c3654ab0
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/madoo/variant.c
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <fw_config.h>
+#include <sar.h>
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	const char *filename = NULL;
+
+	if (fw_config_probe(FW_CONFIG(TABLETMODE, TABLETMODE_ENABLED)))
+		filename = "wifi_sar-madoo.hex";
+
+	return filename;
+}