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/*
* flash_rom.c: Turnning on Flash Write Enable for SiS 630/950 M/Bs,
* use this program before loading DoC drivers.
*
*
* Copyright 2000 Silicon Integrated System Corporation
*
* 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
*
* $Id$
*/
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/io.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
char b;
/* get io privilege access PCI configuration space */
if (iopl(3) != 0) {
perror("Can not set io priviliage");
exit(1);
}
/* Enable 0xFFF8000~0xFFFF0000 decoding on SiS 540/630 */
outl(0x80000840, 0x0cf8);
b = inb(0x0cfc) | 0x0b;
outb(b, 0xcfc);
/* Flash write enable on SiS 540/630 */
outl(0x80000845, 0x0cf8);
b = inb(0x0cfd) | 0x40;
outb(b, 0xcfd);
/* The same thing on SiS 950 SuperIO side */
outb(0x87, 0x2e);
outb(0x01, 0x2e);
outb(0x55, 0x2e);
outb(0x55, 0x2e);
if (inb(0x2f) != 0x87) {
printf("Can not access SiS 950\n");
return -1;
}
outb(0x24, 0x2e);
b = inb(0x2f) | 0xfc;
outb(0x24, 0x2e);
outb(b, 0x2f);
outb(0x02, 0x2e);
outb(0x02, 0x2f);
return (0);
}
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