zephyr: Add support for devices without erase and reduced erases (c12dcedb) · Commits · Wenxi XU / Mcuboot

boot/zephyr/Kconfig

+38 −0

Original line number	Diff line number	Diff line
		@@ -946,6 +946,44 @@ endif # BOOT_DECOMPRESSION_SUPPORT

		endmenu

		config MCUBOOT_STORAGE_WITHOUT_ERASE
		bool "Support for devices without erase"
		depends on FLASH_HAS_NO_EXPLICIT_ERASE
		default y
		help
		Not all devices require erase before write and, depending on driver,
		may emulate erase by write, as a way to scramble data rather then
		by hardware requirement. This unfortunately means that code that
		does erase before write, when not needed, will write device twice
		which not only reduces device life time but also doubles time
		of any write operation (one write for erase and one write for actual
		write).
		When this option is enabled, MCUboot will check for type of device
		and will avoid erase where not needed.

		config MCUBOOT_STORAGE_WITH_ERASE
		bool "Support for devices with erase"
		depends on FLASH_HAS_EXPLICIT_ERASE
		default y
		help
		Support for devices with erase

		config MCUBOOT_STORAGE_MINIMAL_SCRAMBLE
		bool "Do minimal required work to remove data (EXPERIMENTAL)"
		help
		In some cases MCUboot has to remove data, which usually means make
		it non-viable for MCUboot rather then completely destroyed.
		For example when MCUboot does not want to bother with broken image,
		in some slot, it will remove it.
		The same can be achieved with just removal of header and footer,
		leaving the rest of image untouched, as without header MCUboot will
		not be able to recognize image in slot as bootable.
		When this option is enabled, MCUboot will not attempt to erase
		entire slot or image, instead it will just remove enough of
		data from slot to not recognize it as image anymore.
		Depending on type of device this may be done by erase of minimal
		number of pages or overwrite of part of image.

		config MCUBOOT_DEVICE_SETTINGS
		# Hidden selector for device-specific settings
		bool

boot/zephyr/include/flash_map_backend/flash_map_backend.h

+17 −0

Original line number	Diff line number	Diff line
		@@ -106,6 +106,23 @@ static inline uint32_t flash_sector_get_size(const struct flash_sector *fs)
		int flash_area_get_sector(const struct flash_area *fa, off_t off,
		struct flash_sector *fs);


		#if defined(CONFIG_MCUBOOT)
		static inline bool flash_area_erase_required(const struct flash_area *fa)
		{
		#if defined(CONFIG_FLASH_HAS_EXPLICIT_ERASE) && defined(CONFIG_FLASH_HAS_NO_EXPLICIT_ERASE)
		const struct flash_parameters *fp = flash_get_parameters(flash_area_get_device(fa));

		return flash_params_get_erase_cap(flash_get_parameters(flash_area_get_device(fa))) &
		FLASH_ERASE_C_EXPLICIT;
		#elif defined(CONFIG_FLASH_HAS_EXPLICIT_ERASE)
		return true;
		#else
		return false;
		#endif
		}
		#endif

		#ifdef __cplusplus
		}
		#endif

boot/zephyr/include/mcuboot_config/mcuboot_config.h

+23 −0

Original line number	Diff line number	Diff line
		@@ -303,6 +303,29 @@
		#define MCUBOOT_ERASE_PROGRESSIVELY
		#endif

		/*
		* Devices that do not require erase prior to write or do not support
		* erase should avoid emulation of erase by additional write.
		* The emulation is also taking time which doubles required write time
		* for such devices.
		*/
		#ifdef CONFIG_MCUBOOT_STORAGE_WITHOUT_ERASE
		#define MCUBOOT_SUPPORT_DEV_WITHOUT_ERASE
		#endif

		#ifdef CONFIG_MCUBOOT_STORAGE_WITH_ERASE
		#define MCUBOOT_SUPPORT_DEV_WITH_ERASE
		#endif

		/*
		* MCUboot often calls erase on device just to remove data or make application
		* image not recognizable. In such instances it may be faster to just remove
		* portion of data to make image unrecognizable.
		*/
		#ifdef CONFIG_MCUBOOT_STORAGE_MINIMAL_SCRAMBLE
		#define MCUBOOT_MINIMAL_SCRAMBLE
		#endif

		/*
		* Enabling this option uses newer flash map APIs. This saves RAM and
		* avoids deprecated API usage.

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