1 /* 2 * (C) Copyright 2007-2011 3 * Allwinner Technology Co., Ltd. <www.allwinnertech.com> 4 * Tom Cubie <tangliang@allwinnertech.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 #ifndef _ASM_ARCH_SPL_H_ 9 #define _ASM_ARCH_SPL_H_ 10 11 #define BOOT0_MAGIC "eGON.BT0" 12 #define SPL_SIGNATURE "SPL" /* marks "sunxi" SPL header */ 13 #define SPL_HEADER_VERSION 1 14 15 #ifdef CONFIG_SUNXI_HIGH_SRAM 16 #define SPL_ADDR 0x10000 17 #else 18 #define SPL_ADDR 0x0 19 #endif 20 21 /* The low 8-bits of the 'boot_media' field in the SPL header */ 22 #define SUNXI_BOOTED_FROM_MMC0 0 23 #define SUNXI_BOOTED_FROM_NAND 1 24 #define SUNXI_BOOTED_FROM_MMC2 2 25 #define SUNXI_BOOTED_FROM_SPI 3 26 27 /* boot head definition from sun4i boot code */ 28 struct boot_file_head { 29 uint32_t b_instruction; /* one intruction jumping to real code */ 30 uint8_t magic[8]; /* ="eGON.BT0" or "eGON.BT1", not C-style str */ 31 uint32_t check_sum; /* generated by PC */ 32 uint32_t length; /* generated by PC */ 33 /* 34 * We use a simplified header, only filling in what is needed 35 * by the boot ROM. To be compatible with Allwinner tools we 36 * would need to implement the proper fields here instead of 37 * padding. 38 * 39 * Actually we want the ability to recognize our "sunxi" variant 40 * of the SPL. To do so, let's place a special signature into the 41 * "pub_head_size" field. We can reasonably expect Allwinner's 42 * boot0 to always have the upper 16 bits of this set to 0 (after 43 * all the value shouldn't be larger than the limit imposed by 44 * SRAM size). 45 * If the signature is present (at 0x14), then we know it's safe 46 * to use the remaining 8 bytes (at 0x18) for our own purposes. 47 * (E.g. sunxi-tools "fel" utility can pass information there.) 48 */ 49 union { 50 uint32_t pub_head_size; 51 uint8_t spl_signature[4]; 52 }; 53 uint32_t fel_script_address; 54 /* 55 * If the fel_uEnv_length member below is set to a non-zero value, 56 * it specifies the size (byte count) of data at fel_script_address. 57 * At the same time this indicates that the data is in uEnv.txt 58 * compatible format, ready to be imported via "env import -t". 59 */ 60 uint32_t fel_uEnv_length; 61 uint32_t reserved1[2]; 62 uint32_t boot_media; /* written here by the boot ROM */ 63 uint32_t reserved2[5]; /* padding, align to 64 bytes */ 64 }; 65 66 #define is_boot0_magic(addr) (memcmp((void *)addr, BOOT0_MAGIC, 8) == 0) 67 68 #endif 69