diff --git a/boards/yarm/Makefile.include b/boards/yarm/Makefile.include
index 0c4862de71..1db4363d1f 100644
--- a/boards/yarm/Makefile.include
+++ b/boards/yarm/Makefile.include
@@ -1 +1,16 @@
 include $(RIOTMAKE)/boards/sam0.inc.mk
+
+TERMDELAYDEPS := $(filter reset flash flash-only, $(MAKECMDGOALS))
+ifneq (,$(TERMDELAYDEPS))
+  # By default, add 2 seconds delay before opening terminal: this is required
+  # when opening the terminal right after flashing. In this case, the stdio
+  # over USB needs some time after reset before being ready.
+  TERM_DELAY ?= 2
+  TERMDEPS += term-delay
+endif
+
+TESTRUNNER_CONNECT_DELAY ?= $(TERM_DELAY)
+$(call target-export-variables,test,TESTRUNNER_CONNECT_DELAY)
+
+term-delay: $(TERMDELAYDEPS)
+	sleep $(TERM_DELAY)