+/**
+ * spl_invoke_atf - boot using an ARM trusted firmware image
+ */
+void spl_invoke_atf(struct spl_image_info *spl_image);
+
+/**
+ * spl_optee_entry - entry function for optee
+ *
+ * args defind in op-tee project
+ * https://github.com/OP-TEE/optee_os/
+ * core/arch/arm/kernel/generic_entry_a32.S
+ * @arg0: pagestore
+ * @arg1: (ARMv7 standard bootarg #1)
+ * @arg2: device tree address, (ARMv7 standard bootarg #2)
+ * @arg3: non-secure entry address (ARMv7 bootarg #0)
+ */
+void spl_optee_entry(void *arg0, void *arg1, void *arg2, void *arg3);
+
+/**
+ * board_return_to_bootrom - allow for boards to continue with the boot ROM
+ *
+ * If a board (e.g. the Rockchip RK3368 boards) provide some
+ * supporting functionality for SPL in their boot ROM and the SPL
+ * stage wants to return to the ROM code to continue booting, boards
+ * can implement 'board_return_to_bootrom'.
+ */
+void board_return_to_bootrom(void);
+
+/**
+ * board_spl_fit_post_load - allow process images after loading finished
+ *
+ */
+void board_spl_fit_post_load(ulong load_addr, size_t length);
+
+/**
+ * board_spl_fit_size_align - specific size align before processing payload
+ *
+ */
+ulong board_spl_fit_size_align(ulong size);
+
+/**
+ * spl_perform_fixups() - arch/board-specific callback before processing
+ * the boot-payload
+ */
+void spl_perform_fixups(struct spl_image_info *spl_image);
+
+/*
+ * spl_get_load_buffer() - get buffer for loading partial image data
+ *
+ * Returns memory area which can be populated by partial image data,
+ * ie. uImage or fitImage header.
+ */
+struct image_header *spl_get_load_buffer(ssize_t offset, size_t size);
+