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/*
* 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>
#ifdef __sun__
#include <inttypes.h>
#else
#include <stdint.h>
#endif
#ifdef __i386__
#define cpu_to_be32(x) le32_to_cpu(x)
#define cpu_to_be16(x) le16_to_cpu(x)
#else
#define cpu_to_be32(x) (x)
#define cpu_to_be16(x) (x)
#endif
#define cpu_to_le32(x) le32_to_cpu((x))
unsigned long le32_to_cpu(unsigned long x)
{
return (((x & 0x000000ffU) << 24) |
((x & 0x0000ff00U) << 8) |
((x & 0x00ff0000U) >> 8) |
((x & 0xff000000U) >> 24));
}
#define cpu_to_le16(x) le16_to_cpu((x))
unsigned short le16_to_cpu(unsigned short x)
{
return (((x & 0x00ff) << 8) |
((x & 0xff00) >> 8));
}
/* 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)
uint32_t copy_image(int32_t in_fd, int32_t out_fd)
{
uint8_t buf[SIZE];
int n;
uint32_t image_size = 0;
uint8_t zero = 0;
lseek(in_fd, ELF_HEADER_SIZE, SEEK_SET);
/* Copy an image while recording its size */
while ( (n = read(in_fd, buf, SIZE)) > 0 )
{
image_size = image_size + n;
write(out_fd, buf, n);
}
/* BUG romboot requires that our size is divisible by 2 */
/* align image to 2 byte boundary */
if (image_size % 2)
{
image_size++;
write(out_fd, &zero, 1);
}
return image_size;
}
void write_bugboot_header(int32_t out_fd, uint32_t boot_size)
{
uint8_t header_block[HEADER_SIZE];
bug_boot_header_t *bbh = (bug_boot_header_t *)&header_block[0];
memset(header_block, 0, HEADER_SIZE);
/* Fill in the PPCBUG ROM boot header */
strncpy(bbh->magic_word, "BOOT", 4); /* PPCBUG magic word */
bbh->entry_offset = cpu_to_be32(HEADER_SIZE); /* Entry address */
bbh->routine_length= cpu_to_be32(HEADER_SIZE+boot_size+2); /* Routine length */
strncpy(bbh->routine_name, "LINUXROM", 8); /* Routine name */
/* Output the header and bootloader to the file */
write(out_fd, header_block, HEADER_SIZE);
}
uint16_t calc_checksum(int32_t bug_fd)
{
uint32_t checksum_var = 0;
uint8_t buf[2];
int n;
/* Checksum loop */
while ( (n = read(bug_fd, buf, 2) ) )
{
checksum_var = checksum_var + *(uint16_t *)buf;
/* If we carry out, mask it and add one to the checksum */
if (checksum_var >> 16)
checksum_var = (checksum_var & 0x0000ffff) + 1;
}
return checksum_var;
}
int main(int argc, char *argv[])
{
int32_t image_fd, bugboot_fd;
int argptr = 1;
uint32_t kernel_size = 0;
uint16_t checksum = 0;
uint8_t bugbootname[256];
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[argptr] , 0)) < 0)
exit(-1);
argptr++;
/* bugboot file */
if ( !strcmp( argv[argptr], "-" ) )
bugboot_fd = 1; /* stdout */
else
if ((bugboot_fd = creat( argv[argptr] , 0755)) < 0)
exit(-1);
else
strcpy(bugbootname, argv[argptr]);
argptr++;
/* 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);
close(image_fd);
/* 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);
/* Close bugboot file */
close(bugboot_fd);
/* Reopen it as read/write */
bugboot_fd = open(bugbootname, O_RDWR);
/* Calculate checksum */
checksum = calc_checksum(bugboot_fd);
/* Write out the calculated checksum */
write(bugboot_fd, &checksum, 2);
return 0;
}
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