zephyr: allow to not defined scratch area in upgrade-only mode

Scratch area is unneeded if CONFIG_BOOT_SWAP_USING_SCRATCH=n.
This was not reflected so fare which causes build faliure.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

Author: nvlsianpu

boot/zephyr/flash_map_extended.c

@@ -59,9 +59,9 @@ int flash_area_id_from_multi_image_slot(int image_index, int slot)
     case 0: return FLASH_AREA_IMAGE_PRIMARY(image_index);
 #if !defined(CONFIG_SINGLE_APPLICATION_SLOT)
     case 1: return FLASH_AREA_IMAGE_SECONDARY(image_index);
-#if !defined(CONFIG_BOOT_SWAP_USING_MOVE)
-    case 2: return FLASH_AREA_IMAGE_SCRATCH;
 #endif
+#if defined(CONFIG_BOOT_SWAP_USING_SCRATCH)
+    case 2: return FLASH_AREA_IMAGE_SCRATCH;
 #endif
     }
 

boot/zephyr/include/target.h

@@ -38,7 +38,7 @@
     !defined(FLASH_ALIGN) ||                  \
     !(FLASH_AREA_LABEL_EXISTS(image_0)) || \
     !(FLASH_AREA_LABEL_EXISTS(image_1) || CONFIG_SINGLE_APPLICATION_SLOT) || \
-    (!defined(CONFIG_BOOT_SWAP_USING_MOVE) && !FLASH_AREA_LABEL_EXISTS(image_scratch) && !defined(CONFIG_SINGLE_APPLICATION_SLOT))
+    (defined(CONFIG_BOOT_SWAP_USING_SCRATCH) && !FLASH_AREA_LABEL_EXISTS(image_scratch))
 #error "Target support is incomplete; cannot build mcuboot."
 #endif