taught the flasher how to export the UART
diff --git a/bbb_cape/src/flasher/flasher.gyp b/bbb_cape/src/flasher/flasher.gyp
index 2d506b8..fba1477 100644
--- a/bbb_cape/src/flasher/flasher.gyp
+++ b/bbb_cape/src/flasher/flasher.gyp
@@ -17,6 +17,7 @@
         '<(EXTERNALS):stm32flash',
         '<(AOS)/build/aos.gyp:logging',
         '<(DEPTH)/bbb_cape/src/bbb/bbb.gyp:gpios',
+        '<(DEPTH)/bbb_cape/src/bbb/bbb.gyp:export_uart',
         '<(AOS)/common/common.gyp:time',
       ],
     },