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