From df4469f92ba75271c8fb6801eead675f9f440040 Mon Sep 17 00:00:00 2001
From: mrmcwethy <mrmcwethy@yahoo.com>
Date: Fri, 29 Jun 2018 12:22:31 -0700
Subject: [PATCH] Test the BOARD parameter for nullness; display a error if
 nothing provided

---
 ports/atmel-samd/Makefile | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/ports/atmel-samd/Makefile b/ports/atmel-samd/Makefile
index b7181aa3b1..678ddffa3b 100644
--- a/ports/atmel-samd/Makefile
+++ b/ports/atmel-samd/Makefile
@@ -4,9 +4,12 @@ PYTHON3 ?= python3
 
 # Select the board to build for: if not given on the command line,
 # then default to PYBV10.
-BOARD ?= metro_m0_express
-ifeq ($(wildcard boards/$(BOARD)/.),)
-$(error Invalid BOARD specified)
+ifeq ($(BOARD),)
+  $(error You must provide a BOARD parameter)
+else
+  ifeq ($(wildcard boards/$(BOARD)/.),)
+    $(error Invalid BOARD specified)
+  endif
 endif