tools/mksunxiboot.c

   1 /*
   2  * (C) Copyright 2007-2011
   3  * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
   4  * Tom Cubie <tangliang@allwinnertech.com>
   5  *
   6  * a simple tool to generate bootable image for sunxi platform.
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10 #include <fcntl.h>
  11 #include <stdio.h>
  12 #include <unistd.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <errno.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include "../arch/arm/include/asm/arch-sunxi/spl.h"
  19
  20 #define STAMP_VALUE                     0x5F0A6C39
  21
  22 /* check sum functon from sun4i boot code */
  23 int gen_check_sum(struct boot_file_head *head_p)
  24 {
  25         uint32_t length;
  26         uint32_t *buf;
  27         uint32_t loop;
  28         uint32_t i;
  29         uint32_t sum;
  30
  31         length = le32_to_cpu(head_p->length);
  32         if ((length & 0x3) != 0)        /* must 4-byte-aligned */
  33                 return -1;
  34         buf = (uint32_t *)head_p;
  35         head_p->check_sum = cpu_to_le32(STAMP_VALUE);   /* fill stamp */
  36         loop = length >> 2;
  37
  38         /* calculate the sum */
  39         for (i = 0, sum = 0; i < loop; i++)
  40                 sum += le32_to_cpu(buf[i]);
  41
  42         /* write back check sum */
  43         head_p->check_sum = cpu_to_le32(sum);
  44
  45         return 0;
  46 }
  47
  48 #define ALIGN(x, a) __ALIGN_MASK((x), (typeof(x))(a)-1)
  49 #define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
  50
  51 #define SUNXI_SRAM_SIZE 0x8000  /* SoC with smaller size are limited before */
  52 #define SRAM_LOAD_MAX_SIZE (SUNXI_SRAM_SIZE - sizeof(struct boot_file_head))
  53
  54 /*
  55  * BROM (at least on A10 and A20) requires NAND-images to be explicitly aligned
  56  * to a multiple of 8K, and rejects the image otherwise. MMC-images are fine
  57  * with 512B blocks. To cater for both, align to the largest of the two.
  58  */
  59 #define BLOCK_SIZE 0x2000
  60
  61 struct boot_img {
  62         struct boot_file_head header;
  63         char code[SRAM_LOAD_MAX_SIZE];
  64         char pad[BLOCK_SIZE];
  65 };
  66
  67 int main(int argc, char *argv[])
  68 {
  69         int fd_in, fd_out;
  70         struct boot_img img;
  71         unsigned file_size;
  72         int count;
  73         char *tool_name = argv[0];
  74         char *default_dt = NULL;
  75
  76         /* a sanity check */
  77         if ((sizeof(img.header) % 32) != 0) {
  78                 fprintf(stderr, "ERROR: the SPL header must be a multiple ");
  79                 fprintf(stderr, "of 32 bytes.\n");
  80                 return EXIT_FAILURE;
  81         }
  82
  83         /* process optional command line switches */
  84         while (argc >= 2 && argv[1][0] == '-') {
  85                 if (strcmp(argv[1], "--default-dt") == 0) {
  86                         if (argc >= 3) {
  87                                 default_dt = argv[2];
  88                                 argv += 2;
  89                                 argc -= 2;
  90                                 continue;
  91                         }
  92                         fprintf(stderr, "ERROR: no --default-dt arg\n");
  93                         return EXIT_FAILURE;
  94                 } else {
  95                         fprintf(stderr, "ERROR: bad option '%s'\n", argv[1]);
  96                         return EXIT_FAILURE;
  97                 }
  98         }
  99
 100         if (argc < 3) {
 101                 printf("This program converts an input binary file to a sunxi bootable image.\n");
 102                 printf("\nUsage: %s [options] input_file output_file\n",
 103                        tool_name);
 104                 printf("Where [options] may be:\n");
 105                 printf("  --default-dt arg         - 'arg' is the default device tree name\n");
 106                 printf("                             (CONFIG_DEFAULT_DEVICE_TREE).\n");
 107                 return EXIT_FAILURE;
 108         }
 109
 110         fd_in = open(argv[1], O_RDONLY);
 111         if (fd_in < 0) {
 112                 perror("Open input file");
 113                 return EXIT_FAILURE;
 114         }
 115
 116         memset(&img, 0, sizeof(img));
 117
 118         /* get input file size */
 119         file_size = lseek(fd_in, 0, SEEK_END);
 120
 121         if (file_size > SRAM_LOAD_MAX_SIZE) {
 122                 fprintf(stderr, "ERROR: File too large!\n");
 123                 return EXIT_FAILURE;
 124         }
 125
 126         fd_out = open(argv[2], O_WRONLY | O_CREAT, 0666);
 127         if (fd_out < 0) {
 128                 perror("Open output file");
 129                 return EXIT_FAILURE;
 130         }
 131
 132         /* read file to buffer to calculate checksum */
 133         lseek(fd_in, 0, SEEK_SET);
 134         count = read(fd_in, img.code, file_size);
 135         if (count != file_size) {
 136                 perror("Reading input image");
 137                 return EXIT_FAILURE;
 138         }
 139
 140         /* fill the header */
 141         img.header.b_instruction =      /* b instruction */
 142                 0xEA000000 |    /* jump to the first instr after the header */
 143                 ((sizeof(struct boot_file_head) / sizeof(int) - 2)
 144                  & 0x00FFFFFF);
 145         memcpy(img.header.magic, BOOT0_MAGIC, 8);       /* no '0' termination */
 146         img.header.length =
 147                 ALIGN(file_size + sizeof(struct boot_file_head), BLOCK_SIZE);
 148         img.header.b_instruction = cpu_to_le32(img.header.b_instruction);
 149         img.header.length = cpu_to_le32(img.header.length);
 150
 151         memcpy(img.header.spl_signature, SPL_SIGNATURE, 3); /* "sunxi" marker */
 152         img.header.spl_signature[3] = SPL_HEADER_VERSION;
 153
 154         if (default_dt) {
 155                 if (strlen(default_dt) + 1 <= sizeof(img.header.string_pool)) {
 156                         strcpy((char *)img.header.string_pool, default_dt);
 157                         img.header.dt_name_offset =
 158                                 cpu_to_le32(offsetof(struct boot_file_head,
 159                                                      string_pool));
 160                 } else {
 161                         printf("WARNING: The SPL header is too small\n");
 162                         printf("         and has no space to store the dt name.\n");
 163                 }
 164         }
 165
 166         gen_check_sum(&img.header);
 167
 168         count = write(fd_out, &img, le32_to_cpu(img.header.length));
 169         if (count != le32_to_cpu(img.header.length)) {
 170                 perror("Writing output");
 171                 return EXIT_FAILURE;
 172         }
 173
 174         close(fd_in);
 175         close(fd_out);
 176
 177         return EXIT_SUCCESS;
 178 }