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-rw-r--r--src/include/ipxe/serial.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/ipxe/serial.h b/src/include/ipxe/serial.h
index c16e56ae6..b47b1d125 100644
--- a/src/include/ipxe/serial.h
+++ b/src/include/ipxe/serial.h
@@ -12,5 +12,6 @@ FILE_LICENCE ( GPL2_OR_LATER );
extern void serial_putc ( int ch );
extern int serial_getc ( void );
extern int serial_ischar ( void );
+extern int serial_initialized;
#endif /* _IPXE_SERIAL_H */