boards: add riotboot feature to tested boards

Currently only tested boards provide the feature riotboot.
Potentially all boards embeding a cortex-m0+/3/4/7 are
able to have riotboot as a feature, but other dependencies
need to be met, e.g. usage of cortexm.ld linker script,
double initialisation of cpu_init(), etc. See doc in
bootloaders/riotboot.

boards/common/iotlab/Makefile.features

@@ -6,5 +6,8 @@ FEATURES_PROVIDED += periph_spi
 FEATURES_PROVIDED += periph_timer
 FEATURES_PROVIDED += periph_uart
 
+# Put other features for this board (in alphabetical order)
+FEATURES_PROVIDED += riotboot
+
 # The board MPU family (used for grouping by the CI system)
 FEATURES_MCU_GROUP = cortex_m3_1

boards/nucleo-l152re/Makefile.features

@@ -9,6 +9,9 @@ FEATURES_PROVIDED += periph_spi
 FEATURES_PROVIDED += periph_timer
 FEATURES_PROVIDED += periph_uart
 
+# Put other features for this board (in alphabetical order)
+FEATURES_PROVIDED += riotboot
+
 # load the common Makefile.features for Nucleo boards
 include $(RIOTBOARD)/common/nucleo64/Makefile.features
 

boards/saml21-xpro/Makefile.features

@@ -7,6 +7,9 @@ FEATURES_PROVIDED += periph_spi
 FEATURES_PROVIDED += periph_timer
 FEATURES_PROVIDED += periph_uart
 
+# Put other features for this board (in alphabetical order)
+FEATURES_PROVIDED += riotboot
+
 # The board MPU family (used for grouping by the CI system)
 FEATURES_MCU_GROUP = cortex_m0_2
 

boards/samr21-xpro/Makefile.features

@@ -8,6 +8,9 @@ FEATURES_PROVIDED += periph_spi
 FEATURES_PROVIDED += periph_timer
 FEATURES_PROVIDED += periph_uart
 
+# Put other features for this board (in alphabetical order)
+FEATURES_PROVIDED += riotboot
+
 # The board MPU family (used for grouping by the CI system)
 FEATURES_MCU_GROUP = cortex_m0_2