83 lines
3.2 KiB
C
83 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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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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* Constants and data structures used in Allwinner "eGON" images, as
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* parsed by the Boot-ROM.
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*
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* Shared between mkimage and the SPL.
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*/
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#ifndef SUNXI_IMAGE_H
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#define SUNXI_IMAGE_H
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#define BOOT0_MAGIC "eGON.BT0"
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#define BROM_STAMP_VALUE 0x5f0a6c39
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#define SPL_SIGNATURE "SPL" /* marks "sunxi" SPL header */
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#define SPL_MAJOR_BITS 3
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#define SPL_MINOR_BITS 5
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#define SPL_VERSION(maj, min) \
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((((maj) & ((1U << SPL_MAJOR_BITS) - 1)) << SPL_MINOR_BITS) | \
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((min) & ((1U << SPL_MINOR_BITS) - 1)))
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#define SPL_HEADER_VERSION SPL_VERSION(0, 2)
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#define SPL_ENV_HEADER_VERSION SPL_VERSION(0, 1)
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#define SPL_DT_HEADER_VERSION SPL_VERSION(0, 2)
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#define SPL_DRAM_HEADER_VERSION SPL_VERSION(0, 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; /* since v0.1, set by sunxi-fel */
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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; /* since v0.1, set by sunxi-fel */
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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; /* since v0.2, set by mksunxiboot */
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uint32_t dram_size; /* in MiB, since v0.3, set by SPL */
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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]; /* since v0.2, filled by mksunxiboot */
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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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#endif
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