From a70f82cf74a62f4774182f97c01fbb0225d87943 Mon Sep 17 00:00:00 2001
From: Daniel Thompson <daniel@redfelineninja.org.uk>
Date: Sat, 1 Feb 2020 13:40:19 +0000
Subject: Makefile: Allow BOARD to come from the environment


diff --git a/Makefile b/Makefile
index c990d14..ffed1fa 100644
--- a/Makefile
+++ b/Makefile
@@ -2,10 +2,10 @@ export PYTHONPATH := $(PWD)/tools/nrfutil:$(PWD)/tools/intelhex:$(PYTHONPATH)
 
 all : bootloader micropython
 
-BOARD=$(error Please set BOARD=)
+BOARD ?= $(error Please set BOARD=)
 
 clean :
-	rm -rf \
+	$(RM) -r \
 		bootloader/_build-$(BOARD)_nrf52832 \
 		micropython/mpy-cross/build \
 		micropython/ports/nrf/build-$(BOARD)-s132
-- 
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