mcuboot: Kconfig options allowing to inform on MCUboot config

The commit adds Kconfig options that allow to inform application
what algorithm is used with MCUboot that will be booting
applications on board.
Kconfig options added:
 - CONFIG_MCUBOOT_BOOTLOADER_MODE_SWAP_WITHOUT_SCRATCH
 - CONFIG_MCUBOOT_BOOTLOADER_MODE_SWAP_SCRATCH
 - CONFIG_MCUBOOT_BOOTLOADER_MODE_SINGLE_APP
 - CONFIG_MCUBOOT_BOOTLOADER_MODE_DIRECT_XIP

Signed-off-by: Dominik Ermel <[email protected]>

Kconfig.mcuboot

@@ -127,4 +127,46 @@ config MCUBOOT_GENERATE_CONFIRMED_IMAGE
 	  The existence of bin and hex files depends on CONFIG_BUILD_OUTPUT_BIN
 	  and CONFIG_BUILD_OUTPUT_HEX.
 
+choice MCUBOOT_BOOTLOADER_MODE
+	prompt "Application assumed MCUboot mode of operation"
+	default MCUBOOT_BOOTLOADER_MODE_SWAP_WITHOUT_SCRATCH # MCUBOOT_BOOTLOADER_MODE
+	help
+	  Informs application build on assumed MCUboot mode of operation.
+	  This is important for validataing application against DT configuration,
+	  which is done by west sign.
+
+config MCUBOOT_BOOTLOADER_MODE_SINGLE_APP
+	bool "MCUboot has been configured for single slot execution"
+	help
+	  MCUboot will only boot slot0_partition placed application and does
+	  not care about other slots. In this mode application is not able
+	  to DFU its own update to secondary slot and all updates need to
+	  be performed using MCUboot serial recovery.
+
+config MCUBOOT_BOOTLOADER_MODE_SWAP_WITHOUT_SCRATCH
+	bool "MCUboot has been configured for swap without scratch operation"
+	help
+	  MCUboot expects slot0_partition and slot1_partition to be present
+	  in DT and application will boot from slot0_partition.
+
+config MCUBOOT_BOOTLOADER_MODE_SWAP_SCRATCH
+	bool "MCUboot has been configured for swap using scratch operation"
+	help
+	  MCUboot expects slot0_partition, slot1_partition and scratch_partition
+	  to be present in DT, and application will boot from slot0_partition.
+	  In this mode scratch_partition is used as temporary storage when
+	  MCUboot swaps application from the secondary slot to the primary
+	  slot.
+
+config MCUBOOT_BOOTLOADER_MODE_DIRECT_XIP
+	bool "MCUboot has been configured for DirectXIP operation"
+	help
+	  MCUboot expects slot0_partition and slot1_partition to exist in DT.
+	  In this mode MCUboot can boot from either partition and will
+	  select one with higher application image version, which usually
+	  means major.minor.patch triple, unless BOOT_VERSION_CMP_USE_BUILD_NUMBER
+	  is also selected that enables comparison of build number.
+
+endchoice # MCUBOOT_BOOTLOADER_MODE
+
 endif # BOOTLOADER_MCUBOOT