diff --git a/include/target.h b/include/target.h
index 45f1605..00f5885 100644
--- a/include/target.h
+++ b/include/target.h
@@ -48,7 +48,7 @@
 void target_fastboot_init(void);
 void target_load_ssd_keystore(void);
 bool target_is_ssd_enabled(void);
-struct mmc_device *target_mmc_device();
+void *target_mmc_device();
 
 bool target_display_panel_node(char *pbuf, uint16_t buf_size);
 
diff --git a/target/init.c b/target/init.c
index 57181d4..537ec41 100644
--- a/target/init.c
+++ b/target/init.c
@@ -145,3 +145,8 @@
 {
 	return false;
 }
+
+__WEAK uint32_t target_boot_device_emmc()
+{
+	return 1;
+}