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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2007-2011
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
* Tom Cubie <tangliang@allwinnertech.com>
*
* a simple tool to generate bootable image for sunxi platform.
*/
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "imagetool.h"
#include "../arch/arm/include/asm/arch-sunxi/spl.h"
#define STAMP_VALUE 0x5F0A6C39
/* check sum functon from sun4i boot code */
int gen_check_sum(struct boot_file_head *head_p)
{
uint32_t length;
uint32_t *buf;
uint32_t loop;
uint32_t i;
uint32_t sum;
length = le32_to_cpu(head_p->length);
if ((length & 0x3) != 0) /* must 4-byte-aligned */
return -1;
buf = (uint32_t *)head_p;
head_p->check_sum = cpu_to_le32(STAMP_VALUE); /* fill stamp */
loop = length >> 2;
/* calculate the sum */
for (i = 0, sum = 0; i < loop; i++)
sum += le32_to_cpu(buf[i]);
/* write back check sum */
head_p->check_sum = cpu_to_le32(sum);
return 0;
}
#define SUNXI_SRAM_SIZE 0x8000 /* SoC with smaller size are limited before */
#define SRAM_LOAD_MAX_SIZE (SUNXI_SRAM_SIZE - sizeof(struct boot_file_head))
/*
* BROM (at least on A10 and A20) requires NAND-images to be explicitly aligned
* to a multiple of 8K, and rejects the image otherwise. MMC-images are fine
* with 512B blocks. To cater for both, align to the largest of the two.
*/
#define BLOCK_SIZE 0x2000
struct boot_img {
struct boot_file_head header;
char code[SRAM_LOAD_MAX_SIZE];
char pad[BLOCK_SIZE];
};
int main(int argc, char *argv[])
{
int fd_in, fd_out;
struct boot_img img;
unsigned file_size;
int count;
char *tool_name = argv[0];
char *default_dt = NULL;
/* a sanity check */
if ((sizeof(img.header) % 32) != 0) {
fprintf(stderr, "ERROR: the SPL header must be a multiple ");
fprintf(stderr, "of 32 bytes.\n");
return EXIT_FAILURE;
}
/* process optional command line switches */
while (argc >= 2 && argv[1][0] == '-') {
if (strcmp(argv[1], "--default-dt") == 0) {
if (argc >= 3) {
default_dt = argv[2];
argv += 2;
argc -= 2;
continue;
}
fprintf(stderr, "ERROR: no --default-dt arg\n");
return EXIT_FAILURE;
} else {
fprintf(stderr, "ERROR: bad option '%s'\n", argv[1]);
return EXIT_FAILURE;
}
}
if (argc < 3) {
printf("This program converts an input binary file to a sunxi bootable image.\n");
printf("\nUsage: %s [options] input_file output_file\n",
tool_name);
printf("Where [options] may be:\n");
printf(" --default-dt arg - 'arg' is the default device tree name\n");
printf(" (CONFIG_DEFAULT_DEVICE_TREE).\n");
return EXIT_FAILURE;
}
fd_in = open(argv[1], O_RDONLY);
if (fd_in < 0) {
perror("Open input file");
return EXIT_FAILURE;
}
memset(&img, 0, sizeof(img));
/* get input file size */
file_size = lseek(fd_in, 0, SEEK_END);
if (file_size > SRAM_LOAD_MAX_SIZE) {
fprintf(stderr, "ERROR: File too large!\n");
return EXIT_FAILURE;
}
fd_out = open(argv[2], O_WRONLY | O_CREAT, 0666);
if (fd_out < 0) {
perror("Open output file");
return EXIT_FAILURE;
}
/* read file to buffer to calculate checksum */
lseek(fd_in, 0, SEEK_SET);
count = read(fd_in, img.code, file_size);
if (count != file_size) {
perror("Reading input image");
return EXIT_FAILURE;
}
/* fill the header */
img.header.b_instruction = /* b instruction */
0xEA000000 | /* jump to the first instr after the header */
((sizeof(struct boot_file_head) / sizeof(int) - 2)
& 0x00FFFFFF);
memcpy(img.header.magic, BOOT0_MAGIC, 8); /* no '0' termination */
img.header.length =
ALIGN(file_size + sizeof(struct boot_file_head), BLOCK_SIZE);
img.header.b_instruction = cpu_to_le32(img.header.b_instruction);
img.header.length = cpu_to_le32(img.header.length);
memcpy(img.header.spl_signature, SPL_SIGNATURE, 3); /* "sunxi" marker */
img.header.spl_signature[3] = SPL_HEADER_VERSION;
if (default_dt) {
if (strlen(default_dt) + 1 <= sizeof(img.header.string_pool)) {
strcpy((char *)img.header.string_pool, default_dt);
img.header.dt_name_offset =
cpu_to_le32(offsetof(struct boot_file_head,
string_pool));
} else {
printf("WARNING: The SPL header is too small\n");
printf(" and has no space to store the dt name.\n");
}
}
gen_check_sum(&img.header);
count = write(fd_out, &img, le32_to_cpu(img.header.length));
if (count != le32_to_cpu(img.header.length)) {
perror("Writing output");
return EXIT_FAILURE;
}
close(fd_in);
close(fd_out);
return EXIT_SUCCESS;
}
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