c32527a140
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Paul Mackerras <paulus@samba.org>
148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
/*
|
|
* Makes a Motorola PPCBUG ROM bootable image which can be flashed
|
|
* into one of the FLASH banks on a Motorola PowerPlus board.
|
|
*
|
|
* Author: Matt Porter <mporter@mvista.com>
|
|
*
|
|
* 2001 (c) MontaVista, Software, Inc. This file is licensed under
|
|
* the terms of the GNU General Public License version 2. This program
|
|
* is licensed "as is" without any warranty of any kind, whether express
|
|
* or implied.
|
|
*/
|
|
|
|
#define ELF_HEADER_SIZE 65536
|
|
|
|
#include <unistd.h>
|
|
#include <sys/stat.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <netinet/in.h>
|
|
#ifdef __sun__
|
|
#include <inttypes.h>
|
|
#else
|
|
#include <stdint.h>
|
|
#endif
|
|
|
|
/* size of read buffer */
|
|
#define SIZE 0x1000
|
|
|
|
/* PPCBUG ROM boot header */
|
|
typedef struct bug_boot_header {
|
|
uint8_t magic_word[4]; /* "BOOT" */
|
|
uint32_t entry_offset; /* Offset from top of header to code */
|
|
uint32_t routine_length; /* Length of code */
|
|
uint8_t routine_name[8]; /* Name of the boot code */
|
|
} bug_boot_header_t;
|
|
|
|
#define HEADER_SIZE sizeof(bug_boot_header_t)
|
|
|
|
void update_checksum(void *buf, size_t size, uint16_t *sum)
|
|
{
|
|
uint32_t csum = *sum;
|
|
|
|
while (size) {
|
|
csum += *(uint16_t *)buf;
|
|
if (csum > 0xffff)
|
|
csum -= 0xffff;
|
|
buf = (uint16_t *)buf + 1;
|
|
size -= 2;
|
|
}
|
|
*sum = csum;
|
|
}
|
|
|
|
uint32_t copy_image(int in_fd, int out_fd, uint16_t *sum)
|
|
{
|
|
uint8_t buf[SIZE];
|
|
int offset = 0;
|
|
int n;
|
|
uint32_t image_size = 0;
|
|
|
|
lseek(in_fd, ELF_HEADER_SIZE, SEEK_SET);
|
|
|
|
/* Copy an image while recording its size */
|
|
while ( (n = read(in_fd, buf + offset, SIZE - offset)) > 0 ) {
|
|
n += offset;
|
|
offset = n & 1;
|
|
n -= offset;
|
|
image_size = image_size + n;
|
|
/* who's going to deal with short writes? */
|
|
write(out_fd, buf, n);
|
|
update_checksum(buf, n, sum);
|
|
if (offset)
|
|
buf[0] = buf[n];
|
|
}
|
|
|
|
/* BUG romboot requires that our size is divisible by 2 */
|
|
/* align image to 2 byte boundary */
|
|
if (offset) {
|
|
image_size += 2;
|
|
buf[1] = '\0';
|
|
write(out_fd, buf, 2);
|
|
update_checksum(buf, 2, sum);
|
|
}
|
|
return image_size;
|
|
}
|
|
|
|
void write_bugboot_header(int out_fd, uint32_t boot_size, uint16_t *sum)
|
|
{
|
|
static bug_boot_header_t bbh = {
|
|
.magic_word = "BOOT",
|
|
.routine_name = "LINUXROM"
|
|
};
|
|
|
|
/* Fill in the PPCBUG ROM boot header */
|
|
bbh.entry_offset = htonl(HEADER_SIZE); /* Entry address */
|
|
bbh.routine_length= htonl(HEADER_SIZE+boot_size+2); /* Routine length */
|
|
|
|
/* Output the header and bootloader to the file */
|
|
write(out_fd, &bbh, sizeof(bug_boot_header_t));
|
|
update_checksum(&bbh, sizeof(bug_boot_header_t), sum);
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int image_fd, bugboot_fd;
|
|
uint32_t kernel_size = 0;
|
|
uint16_t checksum = 0;
|
|
|
|
if (argc != 3) {
|
|
fprintf(stderr, "usage: %s <kernel_image> <bugboot>\n",argv[0]);
|
|
exit(-1);
|
|
}
|
|
|
|
/* Get file args */
|
|
|
|
/* kernel image file */
|
|
if ((image_fd = open(argv[1] , 0)) < 0)
|
|
exit(-1);
|
|
|
|
/* bugboot file */
|
|
if (!strcmp(argv[2], "-"))
|
|
bugboot_fd = 1; /* stdout */
|
|
else if ((bugboot_fd = creat(argv[2] , 0755)) < 0)
|
|
exit(-1);
|
|
|
|
/* Set file position after ROM header block where zImage will be written */
|
|
lseek(bugboot_fd, HEADER_SIZE, SEEK_SET);
|
|
|
|
/* Copy kernel image into bugboot image */
|
|
kernel_size = copy_image(image_fd, bugboot_fd, &checksum);
|
|
|
|
/* Set file position to beginning where header/romboot will be written */
|
|
lseek(bugboot_fd, 0, SEEK_SET);
|
|
|
|
/* Write out BUG header/romboot */
|
|
write_bugboot_header(bugboot_fd, kernel_size, &checksum);
|
|
|
|
/* Write out the calculated checksum */
|
|
lseek(bugboot_fd, 0, SEEK_END);
|
|
write(bugboot_fd, &checksum, 2);
|
|
|
|
/* Close bugboot file */
|
|
close(bugboot_fd);
|
|
return 0;
|
|
}
|