+/* Total bytes of available storage */
+extern __xdata uint32_t ao_storage_total;
+
+/* Block size - device is erased in these units. At least 256 bytes */
+extern __xdata uint32_t ao_storage_block;
+
+/* Byte offset of config block. Will be ao_storage_block bytes long */
+extern __xdata uint32_t ao_storage_config;