bootutil: add BLINFO_FLASH_AREA to report image flash area

Add BLINFO_FLASH_AREA TLV to boot info passed via retention. This is
useful to report the flash area ID of the booted image, which can be
used by boot utilities to read image status

Signed-off-by: Daniel DeGrasse <[email protected]>

Author: danieldegrasse

boot/bootutil/include/bootutil/boot_status.h

@@ -119,6 +119,7 @@ extern "C" {
 #define BLINFO_MAX_APPLICATION_SIZE_IMAGE_2 0x07
 #define BLINFO_MAX_APPLICATION_SIZE_IMAGE_3 0x08
 #define BLINFO_MAX_APPLICATION_SIZE_IMAGE_4 0x09
+#define BLINFO_FLASH_AREA           0x0A
 
 enum mcuboot_mode {
     MCUBOOT_MODE_SINGLE_SLOT,

boot/bootutil/src/boot_record.c

@@ -330,6 +330,12 @@ int boot_save_shared_data(const struct image_header *hdr, const struct flash_are
                                           BLINFO_RUNNING_SLOT,
                                           sizeof(slot), (void *)&slot);
     }
+
+    if (!rc) {
+        rc = boot_add_data_to_shared_area(TLV_MAJOR_BLINFO,
+                                          BLINFO_FLASH_AREA,
+                                          sizeof(fap->fa_id), (void *)&fap->fa_id);
+    }
 #endif
 
 #if defined(MCUBOOT_VERSION_AVAILABLE)