u-boot/arch/arm/include/asm/arch-sunxi/spl.h

/*
 * (C) Copyright 2007-2011
 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
 * Tom Cubie <tangliang@allwinnertech.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
#ifndef	_ASM_ARCH_SPL_H_
#define	_ASM_ARCH_SPL_H_

#define BOOT0_MAGIC		"eGON.BT0"

/* boot head definition from sun4i boot code */
struct boot_file_head {
	uint32_t b_instruction;	/* one intruction jumping to real code */
	uint8_t magic[8];	/* ="eGON.BT0" or "eGON.BT1", not C-style str */
	uint32_t check_sum;	/* generated by PC */
	uint32_t length;	/* generated by PC */
	/*
	 * We use a simplified header, only filling in what is needed
	 * by the boot ROM. To be compatible with Allwinner tools we
	 * would need to implement the proper fields here instead of
	 * padding.
	 */
	uint8_t pad[12];		/* align to 32 bytes */
};

#endif