spi_flash: support working on differnt buses and frequency

components/bootloader_support/include/esp_flash_partitions.h

@@ -103,6 +103,17 @@ inline static __attribute__((deprecated)) esp_err_t esp_partition_table_basic_ve
 {
     return esp_partition_table_verify(partition_table, log_errors, num_partitions);
 }
+
+/**
+ * Check whether the region on the main flash is safe to write.
+ *
+ * @param addr Start address of the region
+ * @param size Size of the region
+ *
+ * @return true if the region is safe to write, otherwise false.
+ */
+bool esp_partition_main_flash_region_safe(size_t addr, size_t size);
+
 #ifdef __cplusplus
 }
 #endif