started working on automatically downloading cape code
diff --git a/bbb_cape/src/cape/uart_byte.h b/bbb_cape/src/cape/uart_byte.h
index e037e36..3423d7a 100644
--- a/bbb_cape/src/cape/uart_byte.h
+++ b/bbb_cape/src/cape/uart_byte.h
@@ -8,7 +8,13 @@
// Spins until 1 byte is received or some amount of time. The timeout is
// timeout_count*(timeout_divider+1)/60MHz.
-// The result is <0 for timeout or the received byte.
+// The result is <0 for timeout/error or the received byte.
+// errors:
+// -1 timeout
+// -2 parity
+// -3 framing
+// -4 noise detected
+// -5 overrun
int uart_byte_receive(uint16_t timeout_count, uint16_t timeout_divider);
// Spins until 1 byte can be written out.