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 #define SPL_ADDR CONFIG_SUNXI_SRAM_ADDRESS 15 16 /* The low 8-bits of the 'boot_media' field in the SPL header */ 17 #define SUNXI_BOOTED_FROM_MMC0 0 18 #define SUNXI_BOOTED_FROM_NAND 1 19 #define SUNXI_BOOTED_FROM_MMC2 2 20 #define SUNXI_BOOTED_FROM_SPI 3 21 22 /* boot head definition from sun4i boot code */ 23 struct boot_file_head { 24 uint32_t b_instruction; /* one intruction jumping to real code */ 25 uint8_t magic[8]; /* ="eGON.BT0" or "eGON.BT1", not C-style str */ 26 uint32_t check_sum; /* generated by PC */ 27 uint32_t length; /* generated by PC */ 28 /* 29 * We use a simplified header, only filling in what is needed 30 * by the boot ROM. To be compatible with Allwinner tools we 31 * would need to implement the proper fields here instead of 32 * padding. 33 * 34 * Actually we want the ability to recognize our "sunxi" variant 35 * of the SPL. To do so, let's place a special signature into the 36 * "pub_head_size" field. We can reasonably expect Allwinner's 37 * boot0 to always have the upper 16 bits of this set to 0 (after 38 * all the value shouldn't be larger than the limit imposed by 39 * SRAM size). 40 * If the signature is present (at 0x14), then we know it's safe 41 * to use the remaining 8 bytes (at 0x18) for our own purposes. 42 * (E.g. sunxi-tools "fel" utility can pass information there.) 43 */ 44 union { 45 uint32_t pub_head_size; 46 uint8_t spl_signature[4]; 47 }; 48 uint32_t fel_script_address; 49 /* 50 * If the fel_uEnv_length member below is set to a non-zero value, 51 * it specifies the size (byte count) of data at fel_script_address. 52 * At the same time this indicates that the data is in uEnv.txt 53 * compatible format, ready to be imported via "env import -t". 54 */ 55 uint32_t fel_uEnv_length; 56 /* 57 * Offset of an ASCIIZ string (relative to the SPL header), which 58 * contains the default device tree name (CONFIG_DEFAULT_DEVICE_TREE). 59 * This is optional and may be set to NULL. Is intended to be used 60 * by flash programming tools for providing nice informative messages 61 * to the users. 62 */ 63 uint32_t dt_name_offset; 64 uint32_t reserved1; 65 uint32_t boot_media; /* written here by the boot ROM */ 66 /* A padding area (may be used for storing text strings) */ 67 uint32_t string_pool[13]; 68 /* The header must be a multiple of 32 bytes (for VBAR alignment) */ 69 }; 70 71 /* Compile time check to assure proper alignment of structure */ 72 typedef char boot_file_head_not_multiple_of_32[1 - 2*(sizeof(struct boot_file_head) % 32)]; 73 74 #define is_boot0_magic(addr) (memcmp((void *)addr, BOOT0_MAGIC, 8) == 0) 75 76 uint32_t sunxi_get_boot_device(void); 77 78 #endif 79