fbf43ac5a6
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1457 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/*
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* flash_rom.c: Turnning on Flash Write Enable for SiS 630/950 M/Bs,
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* use this program before loading DoC drivers.
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*
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*
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* Copyright 2000 Silicon Integrated System Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*
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* Reference:
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* 1. SiS 630 Specification
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* 2. SiS 950 Specification
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*
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* $Id$
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/io.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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int main()
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{
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char b;
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/* get io privilege access PCI configuration space */
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if (iopl(3) != 0) {
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perror("Can not set io priviliage");
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exit(1);
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}
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/* Enable 0xFFF8000~0xFFFF0000 decoding on SiS 540/630 */
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outl(0x80000840, 0x0cf8);
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b = inb(0x0cfc) | 0x0b;
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outb(b, 0xcfc);
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/* Flash write enable on SiS 540/630 */
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outl(0x80000845, 0x0cf8);
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b = inb(0x0cfd) | 0x40;
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outb(b, 0xcfd);
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/* The same thing on SiS 950 SuperIO side */
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outb(0x87, 0x2e);
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outb(0x01, 0x2e);
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outb(0x55, 0x2e);
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outb(0x55, 0x2e);
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if (inb(0x2f) != 0x87) {
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printf("Can not access SiS 950\n");
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return -1;
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}
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outb(0x24, 0x2e);
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b = inb(0x2f) | 0xfc;
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outb(0x24, 0x2e);
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outb(b, 0x2f);
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outb(0x02, 0x2e);
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outb(0x02, 0x2f);
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return (0);
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}
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