1 files changed, 10 insertions, 0 deletions
diff --git a/supervisor/serial.h b/supervisor/serial.h
index 9446ee71c..84b3062a3 100644
--- a/supervisor/serial.h
+++ b/supervisor/serial.h
@@ -30,8 +30,18 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#include "py/mpconfig.h"
+
+#ifdef CIRCUITPY_BOOT_OUTPUT_FILE
+#include "lib/oofatfs/ff.h"
+
+FIL* boot_output_file;
+#endif
+
 void serial_init(void);
 void serial_write(const char* text);
+// Only writes up to given length. Does not check for null termination at all.
+void serial_write_substring(const char* text, uint32_t length);
 char serial_read(void);
 bool serial_bytes_available(void);
 bool serial_connected(void);