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 "asm/arch/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 SUN4I_SRAM_SIZE 0x7600  /* 0x7748+ is used by BROM */
  52 #define SRAM_LOAD_MAX_SIZE (SUN4I_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
  74         if (argc < 2) {
  75                 printf("\tThis program makes an input bin file to sun4i " \
  76                        "bootable image.\n" \
  77                        "\tUsage: %s input_file out_putfile\n", argv[0]);
  78                 return EXIT_FAILURE;
  79         }
  80
  81         fd_in = open(argv[1], O_RDONLY);
  82         if (fd_in < 0) {
  83                 perror("Open input file");
  84                 return EXIT_FAILURE;
  85         }
  86
  87         memset(&img, 0, sizeof(img));
  88
  89         /* get input file size */
  90         file_size = lseek(fd_in, 0, SEEK_END);
  91
  92         if (file_size > SRAM_LOAD_MAX_SIZE) {
  93                 fprintf(stderr, "ERROR: File too large!\n");
  94                 return EXIT_FAILURE;
  95         }
  96
  97         fd_out = open(argv[2], O_WRONLY | O_CREAT, 0666);
  98         if (fd_out < 0) {
  99                 perror("Open output file");
 100                 return EXIT_FAILURE;
 101         }
 102
 103         /* read file to buffer to calculate checksum */
 104         lseek(fd_in, 0, SEEK_SET);
 105         count = read(fd_in, img.code, file_size);
 106         if (count != file_size) {
 107                 perror("Reading input image");
 108                 return EXIT_FAILURE;
 109         }
 110
 111         /* fill the header */
 112         img.header.b_instruction =      /* b instruction */
 113                 0xEA000000 |    /* jump to the first instr after the header */
 114                 ((sizeof(struct boot_file_head) / sizeof(int) - 2)
 115                  & 0x00FFFFFF);
 116         memcpy(img.header.magic, BOOT0_MAGIC, 8);       /* no '0' termination */
 117         img.header.length =
 118                 ALIGN(file_size + sizeof(struct boot_file_head), BLOCK_SIZE);
 119         img.header.b_instruction = cpu_to_le32(img.header.b_instruction);
 120         img.header.length = cpu_to_le32(img.header.length);
 121
 122         memcpy(img.header.spl_signature, SPL_SIGNATURE, 3); /* "sunxi" marker */
 123         img.header.spl_signature[3] = SPL_HEADER_VERSION;
 124
 125         gen_check_sum(&img.header);
 126
 127         count = write(fd_out, &img, le32_to_cpu(img.header.length));
 128         if (count != le32_to_cpu(img.header.length)) {
 129                 perror("Writing output");
 130                 return EXIT_FAILURE;
 131         }
 132
 133         close(fd_in);
 134         close(fd_out);
 135
 136         return EXIT_SUCCESS;
 137 }