boards: don't export FLASH_ADDR

This variable is already export in vars.inc.mk

boards/common/nrf52/Makefile.include

@@ -19,7 +19,7 @@ ifeq (jlink,$(PROGRAMMER))
   # special options when using SoftDevice
   ifneq (,$(filter nordic_softdevice_ble,$(USEPKG)))
     export JLINK_PRE_FLASH := loadfile $(BINDIR)/softdevice.hex
-    export FLASH_ADDR := 0x1f000
+    FLASH_ADDR = 0x1f000
     LINKER_SCRIPT ?= $(RIOTCPU)/$(CPU)/ldscripts/$(CPU_MODEL)_sd.ld
     # murdock: softdevice.hex file is used for flashing
     # It must be taken into account for the test input hash and

boards/hifive1b/Makefile.include

@@ -9,7 +9,7 @@ include $(RIOTMAKE)/tools/serial.inc.mk
 # export JLINK := JLink
 JLINK_DEVICE = FE310
 JLINK_IF = JTAG
-export FLASH_ADDR := 0x20010000
+FLASH_ADDR = 0x20010000
 include $(RIOTMAKE)/tools/jlink.inc.mk
 
 TESTRUNNER_RESET_DELAY = 1

boards/openmote-b/Makefile.include

@@ -21,7 +21,7 @@ ifeq ($(PROGRAMMER),cc2538-bsl)
   include $(RIOTMAKE)/tools/cc2538-bsl.inc.mk
 else ifeq ($(PROGRAMMER),jlink)
   # Special flashing and reset scripts are required due to board hardware
-  export FLASH_ADDR = 0x200000
+  FLASH_ADDR = 0x200000
   JLINK_DEVICE = CC2538SF53
   JLINK_IF = JTAG
   JLINK_RESET_FILE = $(RIOTBOARD)/openmote-b/dist/hw_reset.seg

boards/openmote-cc2538/Makefile.include

@@ -10,7 +10,7 @@ PROGRAMMER ?= cc2538-bsl
 ifeq ($(PROGRAMMER),jlink)
   # setup JLink for flashing
   JLINK_DEVICE = cc2538sf53
-  export FLASH_ADDR := 0x200000
+  FLASH_ADDR = 0x200000
   JLINK_IF = JTAG
   export TUI := 1
   include $(RIOTMAKE)/tools/jlink.inc.mk