From 5e5f75e559f605974afd3767bc650a1cc0ed6f1f Mon Sep 17 00:00:00 2001 From: "Ronald G. Minnich" Date: Tue, 29 Jan 2002 18:21:41 +0000 Subject: Trying to make this general purpose user-land flash burner Corresponding to coreboot v1 svn r489. --- flash_on.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 flash_on.c (limited to 'flash_on.c') diff --git a/flash_on.c b/flash_on.c new file mode 100644 index 0000000..c8952e2 --- /dev/null +++ b/flash_on.c @@ -0,0 +1,74 @@ +/* + * 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 +#include +#include +#include +#include +#include + +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); +} -- cgit v1.1