boot: bootutil: Move erase function location

Moves the erase function from loader to bootutil misc to account
for MCUboot modes that do not include the main loader file

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

Author: nordicjm

boot/bootutil/src/bootutil_misc.c

@@ -557,3 +557,23 @@ boot_read_image_size(struct boot_loader_state *state, int slot, uint32_t *size)
     return rc;
 }
 #endif /* !MCUBOOT_OVERWRITE_ONLY */
+
+/**
+ * Erases a region of device that requires erase prior to write; does
+ * nothing on devices without erase.
+ *
+ * @param fap                   The flash_area containing the region to erase.
+ * @param off                   The offset within the flash area to start the
+ *                              erase.
+ * @param sz                    The number of bytes to erase.
+ *
+ * @return                      0 on success; nonzero on failure.
+ */
+int
+boot_erase_region(const struct flash_area *fap, uint32_t off, uint32_t sz)
+{
+    if (device_requires_erase(fap)) {
+        return flash_area_erase(fap, off, sz);
+    }
+    return 0;
+}

boot/bootutil/src/loader.c

@@ -1229,26 +1229,6 @@ boot_validated_swap_type(struct boot_loader_state *state,
 }
 #endif
 
-/**
- * Erases a region of device that requires erase prior to write; does
- * nothing on devices without erase.
- *
- * @param fap                   The flash_area containing the region to erase.
- * @param off                   The offset within the flash area to start the
- *                              erase.
- * @param sz                    The number of bytes to erase.
- *
- * @return                      0 on success; nonzero on failure.
- */
-int
-boot_erase_region(const struct flash_area *fap, uint32_t off, uint32_t sz)
-{
-    if (device_requires_erase(fap)) {
-        return flash_area_erase(fap, off, sz);
-    }
-    return 0;
-}
-
 /**
  * Removes data from specified region either by writing erase value in place of
  * data or by doing erase, if device has such hardware requirement.