commit b972ffd82c82a7f87fcc22e95ae410353b52298f
Author: ore <ore@bilbringi.europe.flane.local>
Date:   Wed Feb 7 16:29:44 2007 +0100

    Linux 2.6 kernel module for sparc64 / sunblade100
    overwrites the IDPROM with random ethernet-mac / serial
    look at the source if you want other values...
    
    just make and load with insmod:
    $ make
    $ insmod idprom-repair.ko
    $ dmesg | tail
    found eeprom on ebus: addr: 0x1FFF1000000 - 0x1FFF1001FFF
    IDPROM: HostID: 83da60af Serial:   12917598
    IDPROM: Ethernet address: 00:03:ba:da:60:af

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..58b64b1
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+obj-m   += idprom-repair.o
+KDIR    := /lib/modules/$(shell uname -r)/build
+PWD     := $(shell pwd)
+
+all:
+	make -C $(KDIR) M=$(PWD) modules
+
+clean:
+	make -C $(KDIR) M=$(PWD) clean
diff --git a/idprom-repair.c b/idprom-repair.c
new file mode 100644
index 0000000..d807ed1
--- /dev/null
+++ b/idprom-repair.c
@@ -0,0 +1,160 @@
+/*
+ *   Copyright (C) 02/2007 by Olaf Rempel
+ *   razzor@kopf-tisch.de
+ *
+ *   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.,
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/random.h>
+
+#include <asm/ebus.h>
+#include <asm/idprom.h>
+
+/* position of the idprom data */
+#define IDPROM_POS	0x1FD8
+
+/* position of the clock registers */
+#define CLOCK_POS	0x1FF8
+
+/* M48T59 has 8192 byte NVRAM */
+#define NVRAM_END	0x1FFF
+
+static struct resource * get_eeprom_resource(void)
+{
+	struct linux_ebus *ebus;
+	struct linux_ebus_device *edev;
+
+	for_each_ebus(ebus) {
+		for_each_ebusdev(edev, ebus) {
+			if (strcmp(edev->prom_node->name, "eeprom") == 0) {
+				return &edev->resource[0];
+			}
+		}
+	}
+	return NULL;
+}
+
+static void init_nvram(struct resource *res)
+{
+	long addr;
+
+	/* reset nvram-data, but do not overwrite the clock registers */
+	for (addr = 0x0000; addr < CLOCK_POS; addr += 4)
+		outl(0x0, res->start + addr);
+
+	/* todo: kickstart clock? */
+}
+
+static void load_idprom_data(struct resource *res, struct idprom *data)
+{
+	long addr;
+	for (addr = 0; addr < sizeof(struct idprom); addr++)
+		*((u8 *)data + addr) = inb(res->start + IDPROM_POS + addr);
+}
+
+static void save_idprom_data(struct resource *res, struct idprom *data)
+{
+	long addr;
+	for (addr = 0; addr < sizeof(struct idprom); addr++)
+		outb(*((u8 *)data + addr), res->start + IDPROM_POS + addr);
+}
+
+/* Calculate the IDPROM checksum (xor of the data bytes). */
+static unsigned char calc_idprom_cksum(struct idprom *idprom)
+{
+	unsigned char cksum, i, *ptr = (unsigned char *)idprom;
+
+	for (i = cksum = 0; i <= 0x0E; i++)
+		cksum ^= *ptr++;
+
+	return cksum;
+}
+
+static void show_idprom(struct idprom *data)
+{
+	if (data->id_format != 0x01)
+		printk(KERN_DEBUG "IDPROM: Warning, unknown format type!\n");
+
+	if (data->id_cksum != calc_idprom_cksum(data))
+		printk(KERN_DEBUG "IDPROM: Warning, checksum failure (nvram=%x, calc=%x)!\n",
+		        data->id_cksum, calc_idprom_cksum(data));
+
+	printk(KERN_DEBUG "IDPROM: HostID: %02x%02x%02x%02x Serial: %10d\n",
+		data->id_machtype, data->id_ethaddr[3],
+		data->id_ethaddr[4], data->id_ethaddr[5],
+		data->id_sernum);
+
+	printk(KERN_DEBUG "IDPROM: Ethernet address: %02x:%02x:%02x:%02x:%02x:%02x\n",
+	        data->id_ethaddr[0], data->id_ethaddr[1],
+		data->id_ethaddr[2], data->id_ethaddr[3],
+		data->id_ethaddr[4], data->id_ethaddr[5]);
+}
+
+static void randomize_idprom(struct idprom *data)
+{
+	int sernum;
+	memset(data, 0, sizeof(struct idprom));
+
+	// sunblade 100
+	data->id_format = 0x01;
+	data->id_machtype = 0x83;
+
+	// ethernet MAC
+	get_random_bytes(data->id_ethaddr, 6);
+	data->id_ethaddr[0] = 0x00;
+	data->id_ethaddr[1] = 0x03;
+	data->id_ethaddr[2] = 0xba;
+
+	// serial number (4bytes after date)
+	get_random_bytes(&sernum, sizeof(sernum));
+	data->id_sernum = sernum;
+
+	// xor checksum
+	data->id_cksum = calc_idprom_cksum(data);
+}
+
+static int repair_init(void)
+{
+	struct idprom idprom_buffer;
+	struct resource *res = get_eeprom_resource();
+	if (res) {
+		printk(KERN_DEBUG "found eeprom on ebus: addr: 0x%08lX - 0x%08lX\n",
+			res->start, res->end);
+	} else {
+		printk(KERN_DEBUG "no eeprom resource found!\n");
+		return -1;
+	}
+
+	load_idprom_data(res, &idprom_buffer);
+	randomize_idprom(&idprom_buffer);
+	show_idprom(&idprom_buffer);
+
+	init_nvram(res);
+	save_idprom_data(res, &idprom_buffer);
+	return -1;
+}
+
+static void repair_cleanup(void)
+{
+}
+
+module_init(repair_init);
+module_exit(repair_cleanup);
+MODULE_DESCRIPTION("Repairs SUN Blade 100 IDPROM");
+MODULE_AUTHOR("(C) 2007 Olaf Rempel <razzor@kopf-tisch.de>");
+MODULE_LICENSE("GPL");