zephyr: Allow enabling logical sectors

Add Kconfigs:
 - CONFIG_MCUBOOT_LOGICAL_SECTOR_SIZE
 - CONFIG_MCUBOOT_LOGICAL_SECTOR_VALIDATION

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

Author: de-nordic

boot/zephyr/Kconfig

@@ -1094,14 +1094,35 @@ config BOOT_FIH_PROFILE_DEFAULT_HIGH
 
 endmenu
 
+config MCUBOOT_LOGICAL_SECTOR_SIZE
+	int "Size of a logical sector"
+	default 0
+	help
+	  Set to 0 to use hardware sectors. Any other value here should be
+	  aligned to hardware sectors in size and alignment.
+
+config MCUBOOT_LOGICAL_SECTOR_SIZE_SET
+	bool
+	default y if MCUBOOT_LOGICAL_SECTOR_SIZE != 0
+
+config MCUBOOT_LOGICAL_SECTOR_VALIDATION
+	bool "Validate logical sector layout"
+	default true if MCUBOOT_LOGICAL_SECTOR_SIZE != 0
+	depends on MCUBOOT_LOGICAL_SECTOR_SIZE_SET
+	help
+	  Validation of logical sector size against hardware constrains.
+	  Should be used to validate compile-time configuration against run-time
+	  system.
+
 config MCUBOOT_DEVICE_SETTINGS
 	# Hidden selector for device-specific settings
 	bool
 	default y
         # CPU options
 	select MCUBOOT_DEVICE_CPU_CORTEX_M0 if CPU_CORTEX_M0
         # Enable flash page layout if available
-	select FLASH_PAGE_LAYOUT if FLASH_HAS_PAGE_LAYOUT
+	select FLASH_PAGE_LAYOUT if FLASH_HAS_PAGE_LAYOUT && !MCUBOOT_LOGICAL_SECTOR_SIZE_SET
+	select FLASH_PAGE_LAYOUT if FLASH_HAS_PAGE_LAYOUT && MCUBOOT_LOGICAL_SECTOR_VALIDATION
 	# Enable flash_map module as flash I/O back-end
 	select FLASH_MAP
 

boot/zephyr/include/mcuboot_config/mcuboot_config.h

@@ -357,6 +357,27 @@
 #  endif
 #endif
 
+/* If set to non-0 it will use logical sectors rather than querying
+ * device for sector sizes. This slightly reduces code and RAM usage.
+ * Note that the logical sector size has to be multiply of erase
+ * sector size that is biggest for of all devices in the system.
+ */
+#if defined(CONFIG_MCUBOOT_LOGICAL_SECTOR_SIZE)
+#define MCUBOOT_LOGICAL_SECTOR_SIZE		CONFIG_MCUBOOT_LOGICAL_SECTOR_SIZE
+#endif
+
+/* Enable to validate compile time logical sector setup vs the real device layout.
+ * This increases the size of bootloader but is useful to check whether
+ * selected logical sector size can be used with provided partitions
+ * and devices they are placed on.
+ * Once layout is tested, this option should be disabled, for production
+ * devices, as it is pointless to re-validate non-changing setup on
+ * every MCUboot run.
+ */
+#if defined(CONFIG_MCUBOOT_LOGICAL_SECTOR_VALIDATION)
+#define MCUBOOT_LOGICAL_SECTOR_VALIDATION 1
+#endif
+
 #if defined(CONFIG_BOOT_MAX_IMG_SECTORS_AUTO) && defined(MIN_SECTOR_COUNT)
 
 #define MCUBOOT_MAX_IMG_SECTORS       MIN_SECTOR_COUNT