1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2007-2011
4 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
5 * Tom Cubie <tangliang@allwinnertech.com>
7 * a simple tool to generate bootable image for sunxi platform.
15 #include <sunxi_image.h>
16 #include <sys/types.h>
18 #include "imagetool.h"
20 #define STAMP_VALUE 0x5F0A6C39
22 /* check sum functon from sun4i boot code */
23 int gen_check_sum(struct boot_file_head *head_p)
31 length = le32_to_cpu(head_p->length);
32 if ((length & 0x3) != 0) /* must 4-byte-aligned */
34 buf = (uint32_t *)head_p;
35 head_p->check_sum = cpu_to_le32(STAMP_VALUE); /* fill stamp */
38 /* calculate the sum */
39 for (i = 0, sum = 0; i < loop; i++)
40 sum += le32_to_cpu(buf[i]);
42 /* write back check sum */
43 head_p->check_sum = cpu_to_le32(sum);
48 #define SUNXI_SRAM_SIZE 0x8000 /* SoC with smaller size are limited before */
49 #define SRAM_LOAD_MAX_SIZE (SUNXI_SRAM_SIZE - sizeof(struct boot_file_head))
52 * BROM (at least on A10 and A20) requires NAND-images to be explicitly aligned
53 * to a multiple of 8K, and rejects the image otherwise. MMC-images are fine
54 * with 512B blocks. To cater for both, align to the largest of the two.
56 #define BLOCK_SIZE 0x2000
59 struct boot_file_head header;
60 char code[SRAM_LOAD_MAX_SIZE];
64 int main(int argc, char *argv[])
70 char *tool_name = argv[0];
71 char *default_dt = NULL;
74 if ((sizeof(img.header) % 32) != 0) {
75 fprintf(stderr, "ERROR: the SPL header must be a multiple ");
76 fprintf(stderr, "of 32 bytes.\n");
80 /* process optional command line switches */
81 while (argc >= 2 && argv[1][0] == '-') {
82 if (strcmp(argv[1], "--default-dt") == 0) {
89 fprintf(stderr, "ERROR: no --default-dt arg\n");
92 fprintf(stderr, "ERROR: bad option '%s'\n", argv[1]);
98 printf("This program converts an input binary file to a sunxi bootable image.\n");
99 printf("\nUsage: %s [options] input_file output_file\n",
101 printf("Where [options] may be:\n");
102 printf(" --default-dt arg - 'arg' is the default device tree name\n");
103 printf(" (CONFIG_DEFAULT_DEVICE_TREE).\n");
107 fd_in = open(argv[1], O_RDONLY);
109 perror("Open input file");
113 memset(&img, 0, sizeof(img));
115 /* get input file size */
116 file_size = lseek(fd_in, 0, SEEK_END);
118 if (file_size > SRAM_LOAD_MAX_SIZE) {
119 fprintf(stderr, "ERROR: File too large!\n");
123 fd_out = open(argv[2], O_WRONLY | O_CREAT, 0666);
125 perror("Open output file");
129 /* read file to buffer to calculate checksum */
130 lseek(fd_in, 0, SEEK_SET);
131 count = read(fd_in, img.code, file_size);
132 if (count != file_size) {
133 perror("Reading input image");
137 /* fill the header */
138 img.header.b_instruction = /* b instruction */
139 0xEA000000 | /* jump to the first instr after the header */
140 ((sizeof(struct boot_file_head) / sizeof(int) - 2)
142 memcpy(img.header.magic, BOOT0_MAGIC, 8); /* no '0' termination */
144 ALIGN(file_size + sizeof(struct boot_file_head), BLOCK_SIZE);
145 img.header.b_instruction = cpu_to_le32(img.header.b_instruction);
146 img.header.length = cpu_to_le32(img.header.length);
148 memcpy(img.header.spl_signature, SPL_SIGNATURE, 3); /* "sunxi" marker */
149 img.header.spl_signature[3] = SPL_HEADER_VERSION;
152 if (strlen(default_dt) + 1 <= sizeof(img.header.string_pool)) {
153 strcpy((char *)img.header.string_pool, default_dt);
154 img.header.dt_name_offset =
155 cpu_to_le32(offsetof(struct boot_file_head,
158 printf("WARNING: The SPL header is too small\n");
159 printf(" and has no space to store the dt name.\n");
163 gen_check_sum(&img.header);
165 count = write(fd_out, &img, le32_to_cpu(img.header.length));
166 if (count != le32_to_cpu(img.header.length)) {
167 perror("Writing output");