Fix ft2232 TX buffer overflow

git-svn-id: svn://svn.berlios.de/openocd/trunk@1527 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/jtag/ft2232.c

@@ -1589,6 +1589,13 @@ static int ft2232_execute_queue()
 	{
 		if (ft2232_execute_command(cmd) != ERROR_OK)
 			retval = ERROR_JTAG_QUEUE_FAILED;
+		/* Start reading input before FT2232 TX buffer fills up */
+		if (ft2232_expect_read > 280)
+		{
+			if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
+				retval = ERROR_JTAG_QUEUE_FAILED;
+			first_unsent = cmd;
+		}
 		cmd = cmd->next;
 	}