On Fri, Nov 01, 2002 at 08:58:50AM -0800, Brian Macy wrote:
> I just noticed the flash module. I don't see any instructions on how to
> use it (just dd an image?) or on how to extract the image from the sun
> supplied upgrade executable.
I can't recall where the program is to write flash (I used to have it
around), but you should be able to find it with a google search real
easy. As for extracting an OBP flash from a Sun update, use the attached
program I write awhile back to do exactly that.
This program could probably be done more easily using objdump, but I
like writing code, so here it is.
--
Debian - http://www.debian.org/
Linux 1394 - http://www.linux1394.org/
Subversion - http://subversion.tigris.org/
Deqo - http://www.deqo.com/
/* Extract an OBP flash file from a Sun stand-alone update */
/* (C) 2001 Ben Collins <[EMAIL PROTECTED]> */
/* Licensed under the GPLv2 */
/* Sun supplies OBP flash updates via their SunSolve website. These files
* are stand-alone programs that you boot in order to install the flash.
* I've tried booting one of these via SILO, but it doesn't work (maybe
* SILO can be made to do that?).
*
* Anyway, the OBP flash consists of two segments, OBP and POST, each 512k
* bytes long (although it does not actually use all of that). Each of
* these segments is stored in the .text section of the Sun flash update
* program. This program basically searches for the first occurence of the
* flash magic (OBMD), copies 512k from that point, and starts searching
* for the second segment after that. Pretty simple.
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/mman.h>
struct obp {
char magic[4]; /* OBMD */
unsigned int size;
unsigned int checksum;
unsigned int __unknown2;
char name[4]; /* OBP or POST */
unsigned int year;
unsigned char mon;
unsigned char mday;
unsigned char hour;
unsigned char min;
unsigned char major;
unsigned char minor;
unsigned char patchlevel;
unsigned char __unknown3;
};
#define FLASH_SIZE (1024*1024)
static void print_obp_info(struct obp *obp)
{
printf("%-4s\tVersion: %d.%d.%-3d\t%04d/%02d/%02d %02d:%02d\n",
obp->name, obp->major, obp->minor, obp->patchlevel,
obp->year, obp->mon, obp->mday, obp->hour, obp->min);
printf("\tSize: %u\n\tChecksum: %04X\n", obp->size, obp->checksum);
return;
}
int main(int argc, char *argv[])
{
unsigned char *data;
unsigned int size;
int fdin, fdout, i;
char *outfile = "flash-stripped";
struct obp *obp;
if (argc != 2 && argc != 3) {
fprintf(stderr, "Usage: extract-flash <flash-update> [output
file]\n");
exit(1);
}
if (argc == 3) {
outfile = argv[2];
if (unlink(outfile)) {
perror(outfile);
exit(1);
}
}
fdin = open(argv[1], O_RDONLY);
if (fdin < 0) {
perror(argv[1]);
exit(1);
}
fdout = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0644);
if (fdout < 0) {
perror(outfile);
exit(1);
}
size = lseek(fdin, 0, SEEK_END);
if (size < 0) {
perror(argv[1]);
exit(1);
}
data = mmap(0, size, PROT_READ, MAP_SHARED, fdin, 0);
if (data == (void *)-1) {
perror(argv[1]);
exit(1);
}
while (memcmp(data, "OBMD", 4) && size) {
data++;
size--;
}
if (!size) {
fprintf(stderr, "Could not find OBP magic\n");
exit(1);
}
obp = (struct obp *)data;
print_obp_info(obp);
write(fdout, data, FLASH_SIZE/2);
data += FLASH_SIZE/2;
while (memcmp(data, "OBMD", 4) && size) {
data++;
size--;
}
if (!size) {
fprintf(stderr, "Could not find OBP magic\n");
exit(1);
}
obp = (struct obp *)data;
print_obp_info(obp);
write(fdout, data, FLASH_SIZE/2);
close(fdin);
close(fdout);
return 0;
}
