diff --git a/sim/csupport/run.c b/sim/csupport/run.c
index 5d6f6510..dc44c312 100644
--- a/sim/csupport/run.c
+++ b/sim/csupport/run.c
@@ -188,6 +188,37 @@ int flash_area_to_sectors(int idx, int *cnt, struct flash_area *ret)
 	return 0;
 }
 
+int flash_area_get_sectors(int fa_id, uint32_t *count,
+                           struct flash_sector *sectors)
+{
+        int i;
+        struct area *slot;
+
+        for (i = 0; i < flash_areas->num_slots; i++) {
+                if (flash_areas->slots[i].id == fa_id)
+                        break;
+        }
+        if (i == flash_areas->num_slots) {
+                printf("Unsupported area\n");
+                abort();
+        }
+
+        slot = &flash_areas->slots[i];
+
+        if (slot->num_areas > *count) {
+                printf("Too many areas in slot\n");
+                abort();
+        }
+
+        for (i = 0; i < slot->num_areas; i++) {
+                sectors[i].fs_off = slot->areas[i].fa_off -
+                        slot->whole.fa_off;
+                sectors[i].fs_size = slot->areas[i].fa_size;
+        }
+        *count = slot->num_areas;
+
+        return 0;
+}
 
 int bootutil_img_validate(struct image_header *hdr,
                           const struct flash_area *fap,