1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * (C) Copyright 2007-2011 4 * Allwinner Technology Co., Ltd. <www.allwinnertech.com> 5 * Tom Cubie <tangliang@allwinnertech.com> 6 */ 7 #ifndef _ASM_ARCH_SPL_H_ 8 #define _ASM_ARCH_SPL_H_ 9 10 #define BOOT0_MAGIC "eGON.BT0" 11 #define SPL_SIGNATURE "SPL" /* marks "sunxi" SPL header */ 12 #define SPL_HEADER_VERSION 2 13 14 #ifdef CONFIG_SUNXI_HIGH_SRAM 15 #define SPL_ADDR 0x10000 16 #else 17 #define SPL_ADDR 0x0 18 #endif 19 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 25 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 */ 32 /* 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 36 * padding. 37 * 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 43 * SRAM size). 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.) 47 */ 48 union { 49 uint32_t pub_head_size; 50 uint8_t spl_signature[4]; 51 }; 52 uint32_t fel_script_address; 53 /* 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". 58 */ 59 uint32_t fel_uEnv_length; 60 /* 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 65 * to the users. 66 */ 67 uint32_t dt_name_offset; 68 uint32_t reserved1; 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) */ 73 }; 74 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)]; 77 78 #define is_boot0_magic(addr) (memcmp((void *)addr, BOOT0_MAGIC, 8) == 0) 79 80 uint32_t sunxi_get_boot_device(void); 81 82 #endif 83