diff --git a/src/mainboard/google/volteer/variants/lindar/Makefile.inc b/src/mainboard/google/volteer/variants/lindar/Makefile.inc
index b0bfc56..22bcbd7 100644
--- a/src/mainboard/google/volteer/variants/lindar/Makefile.inc
+++ b/src/mainboard/google/volteer/variants/lindar/Makefile.inc
@@ -5,3 +5,5 @@
 romstage-y += memory.c
 
 ramstage-y += gpio.c
+
+ramstage-$(CONFIG_FW_CONFIG) += variant.c
diff --git a/src/mainboard/google/volteer/variants/lindar/variant.c b/src/mainboard/google/volteer/variants/lindar/variant.c
new file mode 100644
index 0000000..b8d7165
--- /dev/null
+++ b/src/mainboard/google/volteer/variants/lindar/variant.c
@@ -0,0 +1,16 @@
+/* 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(WIFI_SAR_ID, WIFI_SAR_ID_0)))
+		filename = "wifi_sar_0.hex";
+	else if (fw_config_probe(FW_CONFIG(WIFI_SAR_ID, WIFI_SAR_ID_1)))
+		filename = "wifi_sar_1.hex";
+
+	return filename;
+}