/*
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* (C) Copyright 2007-2011
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* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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* Tom Cubie <tangliang@allwinnertech.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _ASM_ARCH_SPL_H_
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#define _ASM_ARCH_SPL_H_
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#define BOOT0_MAGIC "eGON.BT0"
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#define SPL_SIGNATURE "SPL" /* marks "sunxi" SPL header */
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#define SPL_HEADER_VERSION 2
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#ifdef CONFIG_SUNXI_HIGH_SRAM
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#define SPL_ADDR 0x10000
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#else
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#define SPL_ADDR 0x0
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#endif
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/* The low 8-bits of the 'boot_media' field in the SPL header */
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#define SUNXI_BOOTED_FROM_MMC0 0
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#define SUNXI_BOOTED_FROM_NAND 1
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#define SUNXI_BOOTED_FROM_MMC2 2
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#define SUNXI_BOOTED_FROM_SPI 3
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/* boot head definition from sun4i boot code */
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struct boot_file_head {
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uint32_t b_instruction; /* one intruction jumping to real code */
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uint8_t magic[8]; /* ="eGON.BT0" or "eGON.BT1", not C-style str */
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uint32_t check_sum; /* generated by PC */
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uint32_t length; /* generated by PC */
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/*
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* We use a simplified header, only filling in what is needed
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* by the boot ROM. To be compatible with Allwinner tools we
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* would need to implement the proper fields here instead of
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* padding.
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*
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* Actually we want the ability to recognize our "sunxi" variant
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* of the SPL. To do so, let's place a special signature into the
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* "pub_head_size" field. We can reasonably expect Allwinner's
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* boot0 to always have the upper 16 bits of this set to 0 (after
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* all the value shouldn't be larger than the limit imposed by
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* SRAM size).
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* If the signature is present (at 0x14), then we know it's safe
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* to use the remaining 8 bytes (at 0x18) for our own purposes.
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* (E.g. sunxi-tools "fel" utility can pass information there.)
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*/
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union {
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uint32_t pub_head_size;
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uint8_t spl_signature[4];
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};
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uint32_t fel_script_address;
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/*
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* If the fel_uEnv_length member below is set to a non-zero value,
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* it specifies the size (byte count) of data at fel_script_address.
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* At the same time this indicates that the data is in uEnv.txt
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* compatible format, ready to be imported via "env import -t".
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*/
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uint32_t fel_uEnv_length;
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/*
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* Offset of an ASCIIZ string (relative to the SPL header), which
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* contains the default device tree name (CONFIG_DEFAULT_DEVICE_TREE).
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* This is optional and may be set to NULL. Is intended to be used
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* by flash programming tools for providing nice informative messages
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* to the users.
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*/
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uint32_t dt_name_offset;
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uint32_t reserved1;
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uint32_t boot_media; /* written here by the boot ROM */
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/* A padding area (may be used for storing text strings) */
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uint32_t string_pool[13];
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/* The header must be a multiple of 32 bytes (for VBAR alignment) */
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};
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/* Compile time check to assure proper alignment of structure */
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typedef char boot_file_head_not_multiple_of_32[1 - 2*(sizeof(struct boot_file_head) % 32)];
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#define is_boot0_magic(addr) (memcmp((void *)addr, BOOT0_MAGIC, 8) == 0)
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#endif
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