1 files changed, 74 insertions, 0 deletions
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 <errno.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/io.h>
+#include <unistd.h>
+#include <stdio.h>
+
+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);
+}