arch/arm/include/asm/arch-sunxi/spl.h

   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      2
  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         /*
  62          * Offset of an ASCIIZ string (relative to the SPL header), which
  63          * contains the default device tree name (CONFIG_DEFAULT_DEVICE_TREE).
  64          * This is optional and may be set to NULL. Is intended to be used
  65          * by flash programming tools for providing nice informative messages
  66          * to the users.
  67          */
  68         uint32_t dt_name_offset;
  69         uint32_t reserved1;
  70         uint32_t boot_media;            /* written here by the boot ROM */
  71         /* A padding area (may be used for storing text strings) */
  72         uint32_t string_pool[13];
  73         /* The header must be a multiple of 32 bytes (for VBAR alignment) */
  74 };
  75
  76 /* Compile time check to assure proper alignment of structure */
  77 typedef char boot_file_head_not_multiple_of_32[1 - 2*(sizeof(struct boot_file_head) % 32)];
  78
  79 #define is_boot0_magic(addr)    (memcmp((void *)addr, BOOT0_MAGIC, 8) == 0)
  80
  81 #endif