examples: add tftp OTA programming example

Makefile.dep

@@ -603,6 +603,13 @@ USEPKG += nanocoap
 USEMODULE += gnrc_sock_udp
 endif
 
+ifneq (,$(filter fw_slots,$(USEMODULE)))
+  USEPKG += tweetnacl
+  USEMODULE += hashes
+  FEATURES_REQUIRED += periph_flashpage
+  FEATURES_REQUIRED += flash_slots
+endif
+
 # include package dependencies
 -include $(USEPKG:%=$(RIOTPKG)/%/Makefile.dep)
 

Makefile.include

@@ -12,9 +12,14 @@ RIOTMAKE       ?= $(RIOTBASE)/makefiles
 RIOTPKG        ?= $(RIOTBASE)/pkg
 RIOTPROJECT    ?= $(shell git rev-parse --show-toplevel 2>/dev/null || pwd)
 GITCACHE       ?= $(RIOTBASE)/dist/tools/git/git-cache
+FW_METADATA    ?= $(RIOTBASE)/dist/tools/firmware_metadata
 APPDIR         ?= $(CURDIR)
 BINDIRBASE     ?= $(APPDIR)/bin
+ifdef FW_SLOT
+BINDIR         ?= $(BINDIRBASE)/$(BOARD)/slot$(FW_SLOT)
+else
 BINDIR         ?= $(BINDIRBASE)/$(BOARD)
+endif
 PKGDIRBASE     ?= $(BINDIRBASE)/pkg/$(BOARD)
 
 __DIRECTORY_VARIABLES := \
@@ -41,6 +46,7 @@ override RIOTMAKE       := $(abspath $(RIOTMAKE))
 override RIOTPKG        := $(abspath $(RIOTPKG))
 override RIOTPROJECT    := $(abspath $(RIOTPROJECT))
 override GITCACHE       := $(abspath $(GITCACHE))
+override FW_METADATA    := $(abspath $(FW_METADATA))
 override APPDIR         := $(abspath $(APPDIR))
 override BINDIRBASE     := $(abspath $(BINDIRBASE))
 override BINDIR         := $(abspath $(BINDIR))
@@ -274,12 +280,14 @@ endif
 # the binaries to link
 BASELIBS += $(BINDIR)/${APPLICATION}.a
 BASELIBS += $(APPDEPS)
+BASELIBS += $(SINGLE_SLOT)
 
 .PHONY: all clean flash term doc debug debug-server reset objdump help info-modules
 .PHONY: ..in-docker-container
 
 ELFFILE ?= $(BINDIR)/$(APPLICATION).elf
 HEXFILE ?= $(ELFFILE:.elf=.hex)
+BINFILE ?= $(ELFFILE:.elf=.bin)
 
 # variables used to compile and link c++
 CPPMIX ?= $(if $(wildcard *.cpp),1,)
@@ -289,6 +297,17 @@ LINKFLAGPREFIX ?= -Wl,
 
 DIRS += $(EXTERNAL_MODULE_DIRS)
 
+# needed for bootloader...
+ifdef FW_SLOT
+TMPBIN          = $(ELFFILE:.elf=.bin)
+SLOTFILE        = $(ELFFILE:.elf=slot$(FW_SLOT).o)
+METADATA_FILE   = $(BINDIR)/$(APPLICATION)-metadata-$(APPID)-$(VERSION).bin
+FW_BINFILE      = $(BINDIR)/$(APPLICATION)-slot$(FW_SLOT)-$(APPID)-$(VERSION).bin
+FW_OBJFILE      = $(BINDIR)/$(APPLICATION)-slot$(FW_SLOT)-$(APPID)-$(VERSION).o
+BOOTLOADER_FILE = $(abspath $(BINDIR)/bootloader-$(APPLICATION).elf)
+HEXFILE         = $(BOOTLOADER_FILE:.elf=.hex)
+endif #FW_SLOT
+
 ifeq ($(BUILD_IN_DOCKER),1)
 all: ..in-docker-container
 else
@@ -303,9 +322,38 @@ else
 endif
 	$(Q)$(SIZE) $(ELFFILE)
 	$(Q)$(OBJCOPY) $(OFLAGS) $(ELFFILE) $(HEXFILE)
+	$(Q)$(OBJCOPY) -O binary $(ELFFILE) $(BINFILE)
 endif
 endif # BUILD_IN_DOCKER
 
+
+ifdef FW_SLOT
+SECKEY = $(FW_METADATA)/key_ed25519.sec
+
+firmware-slot: $(FW_OBJFILE)
+$(FW_OBJFILE): all generate-metadata
+	$(Q)$(OBJCOPY) -O binary $(ELFFILE) $(TMPBIN)
+	$(Q)$(FW_METADATA)/bin/generate-metadata $(TMPBIN) $(VERSION) $(APPID) $(SECKEY) $(METADATA_FILE)
+	$(Q)srec_cat $(TMPBIN) -binary -offset $(FW_METADATA_SPACE) $(METADATA_FILE) -binary -o $(FW_BINFILE) -binary
+	$(Q)$(FW_METADATA)/bin/generate-metadata $(FW_BINFILE) $(VERSION) $(APPID) $(SECKEY) $(METADATA_FILE) --with-metadata
+	$(Q)srec_cat $(TMPBIN) -binary -offset $(FW_METADATA_SPACE) $(METADATA_FILE) -binary -o $(FW_BINFILE) -binary
+	$(Q)$(OBJCOPY) --output-target elf32-littlearm --binary-architecture=arm \
+		--change-section-vma .data=$(OFFSET_SLOT_$(FW_SLOT))\
+		--change-section-lma .data=$(OFFSET_SLOT_$(FW_SLOT))\
+		--rename-section .data=.slot.$(FW_SLOT).text         \
+		--input-target binary $(FW_BINFILE) \
+		$(FW_OBJFILE)
+
+bootloader: $(FW_OBJFILE)
+	$(Q)env -i ELFFILE=$(BOOTLOADER_FILE) PATH=$(PATH) \
+		make BOARD=$(BOARD) SINGLE_SLOT=$(FW_OBJFILE) -C $(RIOTBASE)/bootloader all
+
+generate-metadata: $(FW_METADATA)/bin/generate-metadata
+
+$(FW_METADATA)/bin/generate-metadata:
+	$(Q)env -i FW_METADATA_SPACE=$(FW_METADATA_SPACE) make -C $(FW_METADATA)
+endif # FW_SLOT
+
 ..compiler-check:
 	@command -v $(CC) >/dev/null 2>&1 || \
 		{ $(COLOR_ECHO) \
@@ -314,6 +362,13 @@ endif # BUILD_IN_DOCKER
 
 ..build-message:
 	@$(COLOR_ECHO) '${COLOR_GREEN}Building application "$(APPLICATION)" for "$(BOARD)" with MCU "$(MCU)".${COLOR_RESET}'
+
+ifdef FW_SLOT
+	@$(COLOR_ECHO) '${COLOR_PURPLE}This is a build for FW slot $(FW_SLOT).${COLOR_RESET}'
+endif
+ifeq ($(BOOTLOADER),1)
+	@$(COLOR_ECHO) '${COLOR_PURPLE}This is a Bootloader build.${COLOR_RESET}'
+endif
 	@$(COLOR_ECHO)
 
 # add extra include paths for packages in $(USEMODULE)

bootloader/Makefile

@@ -0,0 +1,41 @@
+# name of your application
+APPLICATION = bootloader
+
+# If no BOARD is found in the environment, use this default:
+BOARD ?= iotlab-m3
+
+# This has to be the absolute path to the RIOT base directory:
+RIOTBASE ?= $(CURDIR)/..
+
+# Comment this out to disable code in RIOT that does safety checking
+# which is not needed in a production environment but helps in the
+# development process:
+#CFLAGS += -DDEVELHELP
+
+# Enable the bootloader flag
+BOOTLOADER = 1
+
+# Activate interactive bootloader, if no specified
+INTERACTIVE_BOOTLOADER ?= 0
+CFLAGS += -DINTERACTIVE_BOOTLOADER=$(INTERACTIVE_BOOTLOADER)
+
+# Import metadata space size, otherwise it will be defaulted to 0x100 by 
+# the code
+CFLAGS += -DFW_METADATA_SPACE=$(FW_METADATA_SPACE)
+
+# Increase stack memory for flashpage requirements
+CFLAGS += -DTHREAD_STACKSIZE_MAIN=\(5*THREAD_STACKSIZE_DEFAULT\)
+
+# Change this to 0 show compiler invocation lines by default:
+QUIET ?= 1
+
+# Use fw_slots module to manage images on ROM
+USEMODULE += fw_slots
+
+# Add also the shell, some shell commands
+ifeq ($(INTERACTIVE_BOOTLOADER),1)
+USEMODULE += shell
+USEMODULE += shell_commands
+endif
+
+include $(RIOTBASE)/Makefile.include

bootloader/README.md

@@ -0,0 +1 @@
+TODO