1 files changed, 136 insertions, 0 deletions
diff --git a/spd_dump.c b/spd_dump.c
new file mode 100644
index 0000000..f45ef31
--- /dev/null
+++ b/spd_dump.c
@@ -0,0 +1,136 @@
+/*
+ * acpi_reset.c: Reboot your LinuxBIOS system with ACPI software watchdo
+ *
+ *
+ * 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
+ *
+ * $Id$
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/io.h>
+#include <unistd.h>
+#include <stdio.h>
+
+unsigned short acpi_base;
+
+void
+waitsmbus()
+{
+	unsigned short port = acpi_base;
+	unsigned char val;
+
+	//printf("waitsmb ..\n");
+
+	for (val = inb(port); (val & 8) == 0; val = inb(port))
+		;
+	//printf("past first test\n");
+}
+
+void
+setsmbus(unsigned char index, unsigned char value)
+{
+	unsigned short port = acpi_base + index;
+
+	//printf("setsmbus: index 0x%02x, value 0x%02x\n", 
+	//	index, value);
+
+	outb(value, port);
+}
+
+unsigned char
+getsmbus(unsigned char index)
+{
+	unsigned short port = acpi_base + index;
+	unsigned char value;
+
+	value = inb(port);
+
+	//printf("getsmbus: index 0x%02x, value 0x%02x\n", 
+	//	index, value);
+
+	return value;
+}
+
+unsigned char
+read_spd(unsigned char slot, unsigned char index)
+{
+	unsigned char value;
+
+	setsmbus(0x03, 0x20);
+
+	setsmbus(0x04, 0xA1 + (slot << 1));
+
+	setsmbus(0x05, index);
+
+	setsmbus(0x03, 0x12);
+
+	waitsmbus();
+
+	value = getsmbus(0x08);
+
+	setsmbus(0x00, 0xFF);
+
+	return value;
+}
+
+main()
+{
+	unsigned char b;
+	unsigned short w;
+
+
+	/* get io privilege access PCI configuration space */
+	if (iopl(3) != 0) {
+		perror("Can not set io priviliage");
+		exit(1);
+	}
+
+	/* Enable ACPI by set B7 on Reg 0x40, LPC */
+	outl(0x80000840, 0x0cf8);
+	b = inb(0x0cfc) | 0x80;
+	outb(b, 0xcfc);
+
+	/* get the ACPI base address for register 0x74,0x75 of LPC */
+	outl(0x80000874, 0x0cf8);
+	w = inw(0x0cfc);
+	acpi_base = w + 0x80;
+
+	printf("Number of bytes used by module manufacturer 0x%02x\n",
+	       read_spd(0x00, 0x00));
+
+	printf("Memory Type 0x%02x\n",
+	       read_spd(0x00, 0x02));
+
+	printf("Number of Row Address bits 0x%02x\n",
+	       read_spd(0x00, 0x03));
+
+	printf("Number of Column Address bits 0x%02x\n",
+	       read_spd(0x00, 0x04));
+
+	printf("Number of Sides 0x%02x\n",
+	       read_spd(0x00, 0x05));
+
+	printf("Number of Banks 0x%02x\n",
+	       read_spd(0x00, 0x11));
+}