mksunxiboot.c
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/*
* (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.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#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>
/* boot head definition from sun4i boot code */
struct boot_file_head {
uint32_t b_instruction; /* one intruction jumping to real code */
uint8_t magic[8]; /* ="eGON.BT0" or "eGON.BT1", not C-style str */
uint32_t check_sum; /* generated by PC */
uint32_t length; /* generated by PC */
/*
* We use a simplified header, only filling in what is needed
* by the boot ROM. To be compatible with Allwinner tools we
* would need to implement the proper fields here instead of
* padding.
*/
uint8_t pad[12]; /* align to 32 bytes */
};
#define BOOT0_MAGIC "eGON.BT0"
#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 ALIGN(x, a) __ALIGN_MASK((x), (typeof(x))(a)-1)
#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
#define SUN4I_SRAM_SIZE 0x7600 /* 0x7748+ is used by BROM */
#define SRAM_LOAD_MAX_SIZE (SUN4I_SRAM_SIZE - sizeof(struct boot_file_head))
#define BLOCK_SIZE 512
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;
if (argc < 2) {
printf("\tThis program makes an input bin file to sun4i " \
"bootable image.\n" \
"\tUsage: %s input_file out_putfile\n", argv[0]);
return EXIT_FAILURE;
}
fd_in = open(argv[1], O_RDONLY);
if (fd_in < 0) {
perror("Open input file");
return EXIT_FAILURE;
}
memset(img.pad, 0, BLOCK_SIZE);
/* 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);
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;
}