/*
 * flash_rom.c: Flash programming utility for SiS 630/950 M/Bs
 *
 *
 * Copyright 2000 Silicon Integrated System Corporation
 * Copyright 2004 Tyan Corp
 *	yhlu yhlu@tyan.com add exclude start and end option
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * Reference:
 *	1. SiS 630 Specification
 *	2. SiS 950 Specification
 *
 * $Id: flash_rom.c,v 1.21 2005/01/11 02:48:22 ollie Exp $
 */

#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
	int fd_mem;
	volatile short *bios;
	unsigned long off,valint;
	unsigned short val;

	if ((fd_mem = open("/dev/mem", O_RDWR)) < 0) {
		perror("Can not open /dev/mem");
		exit(1);
	}

	sscanf(argv[1], "%x=%x", &off, &valint);
	val = valint&0xffff;

	bios = mmap(0, 0x40000, PROT_WRITE | PROT_READ, MAP_SHARED,
		    fd_mem, (off_t) (0x70000000));
	if (bios == MAP_FAILED) {
		perror("Error MMAP /dev/mem");
		exit(1);
	}

	printf("Offset: 0x%x=%02x\n", off, val);
	bios[off] = val;
	munmap((void *) bios, 0x40000);
	return 0;
}