1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * (C) Copyright 2007-2011
4 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
7 * Constants and data structures used in Allwinner "eGON" images, as
8 * parsed by the Boot-ROM.
10 * Shared between mkimage and the SPL.
15 #define BOOT0_MAGIC "eGON.BT0"
16 #define SPL_SIGNATURE "SPL" /* marks "sunxi" SPL header */
17 #define SPL_MAJOR_BITS 3
18 #define SPL_MINOR_BITS 5
19 #define SPL_VERSION(maj, min) \
20 ((((maj) & ((1U << SPL_MAJOR_BITS) - 1)) << SPL_MINOR_BITS) | \
21 ((min) & ((1U << SPL_MINOR_BITS) - 1)))
23 #define SPL_HEADER_VERSION SPL_VERSION(0, 2)
25 #define SPL_ENV_HEADER_VERSION SPL_VERSION(0, 1)
26 #define SPL_DT_HEADER_VERSION SPL_VERSION(0, 2)
27 #define SPL_DRAM_HEADER_VERSION SPL_VERSION(0, 3)
29 /* boot head definition from sun4i boot code */
30 struct boot_file_head {
31 uint32_t b_instruction; /* one intruction jumping to real code */
32 uint8_t magic[8]; /* ="eGON.BT0" or "eGON.BT1", not C-style str */
33 uint32_t check_sum; /* generated by PC */
34 uint32_t length; /* generated by PC */
36 * We use a simplified header, only filling in what is needed
37 * by the boot ROM. To be compatible with Allwinner tools we
38 * would need to implement the proper fields here instead of
41 * Actually we want the ability to recognize our "sunxi" variant
42 * of the SPL. To do so, let's place a special signature into the
43 * "pub_head_size" field. We can reasonably expect Allwinner's
44 * boot0 to always have the upper 16 bits of this set to 0 (after
45 * all the value shouldn't be larger than the limit imposed by
47 * If the signature is present (at 0x14), then we know it's safe
48 * to use the remaining 8 bytes (at 0x18) for our own purposes.
49 * (E.g. sunxi-tools "fel" utility can pass information there.)
52 uint32_t pub_head_size;
53 uint8_t spl_signature[4];
55 uint32_t fel_script_address; /* since v0.1, set by sunxi-fel */
57 * If the fel_uEnv_length member below is set to a non-zero value,
58 * it specifies the size (byte count) of data at fel_script_address.
59 * At the same time this indicates that the data is in uEnv.txt
60 * compatible format, ready to be imported via "env import -t".
62 uint32_t fel_uEnv_length; /* since v0.1, set by sunxi-fel */
64 * Offset of an ASCIIZ string (relative to the SPL header), which
65 * contains the default device tree name (CONFIG_DEFAULT_DEVICE_TREE).
66 * This is optional and may be set to NULL. Is intended to be used
67 * by flash programming tools for providing nice informative messages
70 uint32_t dt_name_offset; /* since v0.2, set by mksunxiboot */
71 uint32_t dram_size; /* in MiB, since v0.3, set by SPL */
72 uint32_t boot_media; /* written here by the boot ROM */
73 /* A padding area (may be used for storing text strings) */
74 uint32_t string_pool[13]; /* since v0.2, filled by mksunxiboot */
75 /* The header must be a multiple of 32 bytes (for VBAR alignment) */
78 /* Compile time check to assure proper alignment of structure */
79 typedef char boot_file_head_not_multiple_of_32[1 - 2*(sizeof(struct boot_file_head) % 32)];