diff --git a/configs/samd20-xplained/include/board.h b/configs/samd20-xplained/include/board.h
index 505cba2455..c8fea05b09 100644
--- a/configs/samd20-xplained/include/board.h
+++ b/configs/samd20-xplained/include/board.h
@@ -343,12 +343,15 @@
 
 /* EDBG/CDC USART on SERCOM3 */
 
+#define BOARD_SERCOM3_SRCGCLKGEN   GCLK_CLKCTRL_GEN0
 #define BOARD_SERCOM3_MUXCONFIG    (USART_CTRLA_RXPAD3 | USART_CTRLA_TXPAD2)
 #define BOARD_SERCOM3_PINMAP_PAD0  0
 #define BOARD_SERCOM3_PINMAP_PAD1  0
 #define BOARD_SERCOM3_PINMAP_PAD2  PORT_SERCOM3_PAD2_1
 #define BOARD_SERCOM3_PINMAP_PAD3  PORT_SERCOM3_PAD3_1
 
+#define BOARD_SERCOM3_FREQUENCY    BOARD_GCLK0_FREQUENCY
+
 /* LED definitions ******************************************************************/
 /* There are three LEDs on board the SAMD20 Xplained Pro board:  The EDBG
  * controls two of the LEDs, a power LED and a status LED.  There is only
diff --git a/configs/z16f2800100zcog/pashello/appconfig b/configs/z16f2800100zcog/pashello/appconfig
deleted file mode 100644
index d35185f5f0..0000000000
--- a/configs/z16f2800100zcog/pashello/appconfig
+++ /dev/null
@@ -1,42 +0,0 @@
-############################################################################
-# configs/z16f2800100zcog/pashello/appconfig
-#
-#   Copyright (C) 2011 Gregory Nutt. All rights reserved.
-#   Author: Gregory Nutt <gnutt@nuttx.org>
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-#
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer.
-# 2. Redistributions in binary form must reproduce the above copyright
-#    notice, this list of conditions and the following disclaimer in
-#    the documentation and/or other materials provided with the
-#    distribution.
-# 3. Neither the name NuttX nor the names of its contributors may be
-#    used to endorse or promote products derived from this software
-#    without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
-# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
-# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-# POSSIBILITY OF SUCH DAMAGE.
-#
-############################################################################
-
-# Path to example in apps/examples containing the user_start entry point
-
-CONFIGURED_APPS += examples/pashello
-
-# Path to the Pascal p-code runtime interpreter module
-
-CONFIGURED_APPS += interpreters/pcode