board/keymile/common/ivm.c - uboot/armada - Git at Google

 /*
  * (C) Copyright 2011
  * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
  *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * 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 <common.h>
 #include <hush.h>
 #include <i2c.h>
 #include "common.h"

 int ivm_calc_crc(unsigned char *buf, int len)
 {
 	const unsigned short crc_tab[16] = {
 		0x0000, 0xCC01, 0xD801, 0x1400,
 		0xF001, 0x3C00, 0x2800, 0xE401,
 		0xA001, 0x6C00, 0x7800, 0xB401,
 		0x5000, 0x9C01, 0x8801, 0x4400};

 	unsigned short crc     = 0;   /* final result */
 	unsigned short r1      = 0;   /* temp */
 	unsigned char  byte    = 0;   /* input buffer */
 	int	i;

 	/* calculate CRC from array data */
 	for (i = 0; i < len; i++) {
 		byte = buf[i];

 		/* lower 4 bits */
 		r1 = crc_tab[crc & 0xF];
 		crc = ((crc) >> 4) & 0x0FFF;
 		crc = crc ^ r1 ^ crc_tab[byte & 0xF];

 		/* upper 4 bits */
 		r1 = crc_tab[crc & 0xF];
 		crc = (crc >> 4) & 0x0FFF;
 		crc = crc ^ r1 ^ crc_tab[(byte >> 4) & 0xF];
 	}
 	return crc;
 }

 static int ivm_set_value(char *name, char *value)
 {
 	char tempbuf[256];

 	if (value != NULL) {
 		sprintf(tempbuf, "%s=%s", name, value);
 		return set_local_var(tempbuf, 0);
 	} else {
 		unset_local_var(name);
 	}
 	return 0;
 }

 static int ivm_get_value(unsigned char *buf, int len, char *name, int off,
 				int check)
 {
 	unsigned short	val;
 	unsigned char	valbuf[30];

 	if ((buf[off + 0] != buf[off + 2]) &&
 	    (buf[off + 2] != buf[off + 4])) {
 		printf("%s Error corrupted %s\n", __func__, name);
 		val = -1;
 	} else {
 		val = buf[off + 0] + (buf[off + 1] << 8);
 		if ((val == 0) && (check == 1))
 			val = -1;
 	}
 	sprintf((char *)valbuf, "%x", val);
 	ivm_set_value(name, (char *)valbuf);
 	return val;
 }

 #define INV_BLOCKSIZE		0x100
 #define INV_DATAADDRESS		0x21
 #define INVENTORYDATASIZE	(INV_BLOCKSIZE - INV_DATAADDRESS - 3)

 #define IVM_POS_SHORT_TEXT		0
 #define IVM_POS_MANU_ID			1
 #define IVM_POS_MANU_SERIAL		2
 #define IVM_POS_PART_NUMBER		3
 #define IVM_POS_BUILD_STATE		4
 #define IVM_POS_SUPPLIER_PART_NUMBER	5
 #define IVM_POS_DELIVERY_DATE		6
 #define IVM_POS_SUPPLIER_BUILD_STATE	7
 #define IVM_POS_CUSTOMER_ID		8
 #define IVM_POS_CUSTOMER_PROD_ID	9
 #define IVM_POS_HISTORY			10
 #define IVM_POS_SYMBOL_ONLY		11

 static char convert_char(char c)
 {
 	return (c < ' ' || c > '~') ? '.' : c;
 }

 static int ivm_findinventorystring(int type,
 					unsigned char *const string,
 					unsigned long maxlen,
 					unsigned char *buf)
 {
 	int xcode = 0;
 	unsigned long cr = 0;
 	unsigned long addr = INV_DATAADDRESS;
 	unsigned long size = 0;
 	unsigned long nr = type;
 	int stop = 0;	/* stop on semicolon */

 	memset(string, '\0', maxlen);
 	switch (type) {
 	case IVM_POS_SYMBOL_ONLY:
 		nr = 0;
 		stop = 1;
 	break;
 	default:
 		nr = type;
 		stop = 0;
 	}

 	/* Look for the requested number of CR. */
 	while ((cr != nr) && (addr < INVENTORYDATASIZE)) {
 		if ((buf[addr] == '\r'))
 			cr++;
 		addr++;
 	}

 	/*
 	 * the expected number of CR was found until the end of the IVM
 	 *  content --> fill string
 	 */
 	if (addr < INVENTORYDATASIZE) {
 		/* Copy the IVM string in the corresponding string */
 		for (; (buf[addr] != '\r')			&&
 			((buf[addr] != ';') ||  (!stop))	&&
 			(size < (maxlen - 1)			&&
 			(addr < INVENTORYDATASIZE)); addr++) {
 			size += sprintf((char *)string + size, "%c",
 						convert_char (buf[addr]));
 		}

 		/*
 		 * copy phase is done: check if everything is ok. If not,
 		 * the inventory data is most probably corrupted: tell
 		 * the world there is a problem!
 		 */
 		if (addr == INVENTORYDATASIZE) {
 			xcode = -1;
 			printf("Error end of string not found\n");
 		} else if ((size > (maxlen - 1)) &&
 			   (buf[addr] != '\r')) {
 			xcode = -1;
 			printf("string too long till next CR\n");
 		}
 	} else {
 		/*
 		 * some CR are missing...
 		 * the inventory data is most probably corrupted
 		 */
 		xcode = -1;
 		printf("not enough cr found\n");
 	}
 	return xcode;
 }

 #define GET_STRING(name, which, len) \
 	if (ivm_findinventorystring(which, valbuf, len, buf) == 0) { \
 		ivm_set_value(name, (char *)valbuf); \
 	}

 static int ivm_check_crc(unsigned char *buf, int block)
 {
 	unsigned long	crc;
 	unsigned long	crceeprom;

 	crc = ivm_calc_crc(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2);
 	crceeprom = (buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 1] + \
 			buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2] * 256);
 	if (crc != crceeprom) {
 		if (block == 0)
 			printf("Error CRC Block: %d EEprom: calculated: \
 			%lx EEprom: %lx\n", block, crc, crceeprom);
 		return -1;
 	}
 	return 0;
 }

 static int ivm_analyze_block2(unsigned char *buf, int len)
 {
 	unsigned char	valbuf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN];
 	unsigned long	count;

 	/* IVM_MAC Adress begins at offset 1 */
 	sprintf((char *)valbuf, "%pM", buf + 1);
 	ivm_set_value("IVM_MacAddress", (char *)valbuf);
 	/* if an offset is defined, add it */
 #if defined(CONFIG_PIGGY_MAC_ADRESS_OFFSET)
 	if (CONFIG_PIGGY_MAC_ADRESS_OFFSET > 0) {
 		unsigned long val = (buf[4] << 16) + (buf[5] << 8) + buf[6];

 		val += CONFIG_PIGGY_MAC_ADRESS_OFFSET;
 		buf[4] = (val >> 16) & 0xff;
 		buf[5] = (val >> 8) & 0xff;
 		buf[6] = val & 0xff;
 		sprintf((char *)valbuf, "%pM", buf + 1);
 	}
 #endif
 #ifdef MACH_TYPE_KM_KIRKWOOD
 	setenv((char *)"ethaddr", (char *)valbuf);
 #else
 	if (getenv("ethaddr") == NULL)
 		setenv((char *)"ethaddr", (char *)valbuf);
 #endif

 	/* IVM_MacCount */
 	count = (buf[10] << 24) +
 		   (buf[11] << 16) +
 		   (buf[12] << 8)  +
 		    buf[13];
 	if (count == 0xffffffff)
 		count = 1;
 	sprintf((char *)valbuf, "%lx", count);
 	ivm_set_value("IVM_MacCount", (char *)valbuf);
 	return 0;
 }

 int ivm_analyze_eeprom(unsigned char *buf, int len)
 {
 	unsigned short	val;
 	unsigned char	valbuf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN];
 	unsigned char	*tmp;

 	if (ivm_check_crc(buf, 0) != 0)
 		return -1;

 	ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
 			"IVM_BoardId", 0, 1);
 	val = ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
 			"IVM_HWKey", 6, 1);
 	if (val != 0xffff) {
 		sprintf((char *)valbuf, "%x", ((val / 100) % 10));
 		ivm_set_value("IVM_HWVariant", (char *)valbuf);
 		sprintf((char *)valbuf, "%x", (val % 100));
 		ivm_set_value("IVM_HWVersion", (char *)valbuf);
 	}
 	ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
 		"IVM_Functions", 12, 0);

 	GET_STRING("IVM_Symbol", IVM_POS_SYMBOL_ONLY, 8)
 	GET_STRING("IVM_DeviceName", IVM_POS_SHORT_TEXT, 64)
 	tmp = (unsigned char *) getenv("IVM_DeviceName");
 	if (tmp) {
 		int	len = strlen((char *)tmp);
 		int	i = 0;

 		while (i < len) {
 			if (tmp[i] == ';') {
 				ivm_set_value("IVM_ShortText",
 					(char *)&tmp[i + 1]);
 				break;
 			}
 			i++;
 		}
 		if (i >= len)
 			ivm_set_value("IVM_ShortText", NULL);
 	} else {
 		ivm_set_value("IVM_ShortText", NULL);
 	}
 	GET_STRING("IVM_ManufacturerID", IVM_POS_MANU_ID, 32)
 	GET_STRING("IVM_ManufacturerSerialNumber", IVM_POS_MANU_SERIAL, 20)
 	GET_STRING("IVM_ManufacturerPartNumber", IVM_POS_PART_NUMBER, 32)
 	GET_STRING("IVM_ManufacturerBuildState", IVM_POS_BUILD_STATE, 32)
 	GET_STRING("IVM_SupplierPartNumber", IVM_POS_SUPPLIER_PART_NUMBER, 32)
 	GET_STRING("IVM_DelieveryDate", IVM_POS_DELIVERY_DATE, 32)
 	GET_STRING("IVM_SupplierBuildState", IVM_POS_SUPPLIER_BUILD_STATE, 32)
 	GET_STRING("IVM_CustomerID", IVM_POS_CUSTOMER_ID, 32)
 	GET_STRING("IVM_CustomerProductID", IVM_POS_CUSTOMER_PROD_ID, 32)

 	if (ivm_check_crc(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2], 2) != 0)
 		return 0;
 	ivm_analyze_block2(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2],
 		CONFIG_SYS_IVM_EEPROM_PAGE_LEN);

 	return 0;
 }

 int ivm_read_eeprom(void)
 {
 #if defined(CONFIG_I2C_MUX)
 	I2C_MUX_DEVICE *dev = NULL;
 #endif
 	uchar i2c_buffer[CONFIG_SYS_IVM_EEPROM_MAX_LEN];
 	uchar	*buf;
 	unsigned long dev_addr = CONFIG_SYS_IVM_EEPROM_ADR;
 	int ret;

 #if defined(CONFIG_I2C_MUX)
 	/* First init the Bus, select the Bus */
 #if defined(CONFIG_SYS_I2C_IVM_BUS)
 	dev = i2c_mux_ident_muxstring((uchar *)CONFIG_SYS_I2C_IVM_BUS);
 #else
 	buf = (unsigned char *) getenv("EEprom_ivm");
 	if (buf != NULL)
 		dev = i2c_mux_ident_muxstring(buf);
 #endif
 	if (dev == NULL) {
 		printf("Error couldnt add Bus for IVM\n");
 		return -1;
 	}
 	i2c_set_bus_num(dev->busid);
 #endif

 	buf = (unsigned char *) getenv("EEprom_ivm_addr");
 	if (buf != NULL) {
 		ret = strict_strtoul((char *)buf, 16, &dev_addr);
 		if (ret != 0)
 			return -3;
 	}

 	/* add deblocking here */
 	i2c_make_abort();

 	ret = i2c_read(dev_addr, 0, 1, i2c_buffer,
 		CONFIG_SYS_IVM_EEPROM_MAX_LEN);
 	if (ret != 0) {
 		printf("Error reading EEprom\n");
 		return -2;
 	}

 	return ivm_analyze_eeprom(i2c_buffer, CONFIG_SYS_IVM_EEPROM_MAX_LEN);
 }
	/*
	* (C) Copyright 2011
	* Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
	*
	* See file CREDITS for list of people who contributed to this
	* project.
	*
	* 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 <common.h>
	#include <hush.h>
	#include <i2c.h>
	#include "common.h"

	int ivm_calc_crc(unsigned char *buf, int len)
	{
	const unsigned short crc_tab[16] = {
	0x0000, 0xCC01, 0xD801, 0x1400,
	0xF001, 0x3C00, 0x2800, 0xE401,
	0xA001, 0x6C00, 0x7800, 0xB401,
	0x5000, 0x9C01, 0x8801, 0x4400};

	unsigned short crc = 0; /* final result */
	unsigned short r1 = 0; /* temp */
	unsigned char byte = 0; /* input buffer */
	int i;

	/* calculate CRC from array data */
	for (i = 0; i < len; i++) {
	byte = buf[i];

	/* lower 4 bits */
	r1 = crc_tab[crc & 0xF];
	crc = ((crc) >> 4) & 0x0FFF;
	crc = crc ^ r1 ^ crc_tab[byte & 0xF];

	/* upper 4 bits */
	r1 = crc_tab[crc & 0xF];
	crc = (crc >> 4) & 0x0FFF;
	crc = crc ^ r1 ^ crc_tab[(byte >> 4) & 0xF];
	}
	return crc;
	}

	static int ivm_set_value(char name, char value)
	{
	char tempbuf[256];

	if (value != NULL) {
	sprintf(tempbuf, "%s=%s", name, value);
	return set_local_var(tempbuf, 0);
	} else {
	unset_local_var(name);
	}
	return 0;
	}

	static int ivm_get_value(unsigned char buf, int len, char name, int off,
	int check)
	{
	unsigned short val;
	unsigned char valbuf[30];

	if ((buf[off + 0] != buf[off + 2]) &&
	(buf[off + 2] != buf[off + 4])) {
	printf("%s Error corrupted %s\n", __func__, name);
	val = -1;
	} else {
	val = buf[off + 0] + (buf[off + 1] << 8);
	if ((val == 0) && (check == 1))
	val = -1;
	}
	sprintf((char *)valbuf, "%x", val);
	ivm_set_value(name, (char *)valbuf);
	return val;
	}

	#define INV_BLOCKSIZE 0x100
	#define INV_DATAADDRESS 0x21
	#define INVENTORYDATASIZE (INV_BLOCKSIZE - INV_DATAADDRESS - 3)

	#define IVM_POS_SHORT_TEXT 0
	#define IVM_POS_MANU_ID 1
	#define IVM_POS_MANU_SERIAL 2
	#define IVM_POS_PART_NUMBER 3
	#define IVM_POS_BUILD_STATE 4
	#define IVM_POS_SUPPLIER_PART_NUMBER 5
	#define IVM_POS_DELIVERY_DATE 6
	#define IVM_POS_SUPPLIER_BUILD_STATE 7
	#define IVM_POS_CUSTOMER_ID 8
	#define IVM_POS_CUSTOMER_PROD_ID 9
	#define IVM_POS_HISTORY 10
	#define IVM_POS_SYMBOL_ONLY 11

	static char convert_char(char c)
	{
	return (c < ' ' \|\| c > '~') ? '.' : c;
	}

	static int ivm_findinventorystring(int type,
	unsigned char *const string,
	unsigned long maxlen,
	unsigned char *buf)
	{
	int xcode = 0;
	unsigned long cr = 0;
	unsigned long addr = INV_DATAADDRESS;
	unsigned long size = 0;
	unsigned long nr = type;
	int stop = 0; /* stop on semicolon */

	memset(string, '\0', maxlen);
	switch (type) {
	case IVM_POS_SYMBOL_ONLY:
	nr = 0;
	stop = 1;
	break;
	default:
	nr = type;
	stop = 0;
	}

	/* Look for the requested number of CR. */
	while ((cr != nr) && (addr < INVENTORYDATASIZE)) {
	if ((buf[addr] == '\r'))
	cr++;
	addr++;
	}

	/*
	* the expected number of CR was found until the end of the IVM
	* content --> fill string
	*/
	if (addr < INVENTORYDATASIZE) {
	/* Copy the IVM string in the corresponding string */
	for (; (buf[addr] != '\r') &&
	((buf[addr] != ';') \|\| (!stop)) &&
	(size < (maxlen - 1) &&
	(addr < INVENTORYDATASIZE)); addr++) {
	size += sprintf((char *)string + size, "%c",
	convert_char (buf[addr]));
	}

	/*
	* copy phase is done: check if everything is ok. If not,
	* the inventory data is most probably corrupted: tell
	* the world there is a problem!
	*/
	if (addr == INVENTORYDATASIZE) {
	xcode = -1;
	printf("Error end of string not found\n");
	} else if ((size > (maxlen - 1)) &&
	(buf[addr] != '\r')) {
	xcode = -1;
	printf("string too long till next CR\n");
	}
	} else {
	/*
	* some CR are missing...
	* the inventory data is most probably corrupted
	*/
	xcode = -1;
	printf("not enough cr found\n");
	}
	return xcode;
	}

	#define GET_STRING(name, which, len) \
	if (ivm_findinventorystring(which, valbuf, len, buf) == 0) { \
	ivm_set_value(name, (char *)valbuf); \
	}

	static int ivm_check_crc(unsigned char *buf, int block)
	{
	unsigned long crc;
	unsigned long crceeprom;

	crc = ivm_calc_crc(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2);
	crceeprom = (buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 1] + \
	buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2] * 256);
	if (crc != crceeprom) {
	if (block == 0)
	printf("Error CRC Block: %d EEprom: calculated: \
	%lx EEprom: %lx\n", block, crc, crceeprom);
	return -1;
	}
	return 0;
	}

	static int ivm_analyze_block2(unsigned char *buf, int len)
	{
	unsigned char valbuf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN];
	unsigned long count;

	/* IVM_MAC Adress begins at offset 1 */
	sprintf((char *)valbuf, "%pM", buf + 1);
	ivm_set_value("IVM_MacAddress", (char *)valbuf);
	/* if an offset is defined, add it */
	#if defined(CONFIG_PIGGY_MAC_ADRESS_OFFSET)
	if (CONFIG_PIGGY_MAC_ADRESS_OFFSET > 0) {
	unsigned long val = (buf[4] << 16) + (buf[5] << 8) + buf[6];

	val += CONFIG_PIGGY_MAC_ADRESS_OFFSET;
	buf[4] = (val >> 16) & 0xff;
	buf[5] = (val >> 8) & 0xff;
	buf[6] = val & 0xff;
	sprintf((char *)valbuf, "%pM", buf + 1);
	}
	#endif
	#ifdef MACH_TYPE_KM_KIRKWOOD
	setenv((char )"ethaddr", (char )valbuf);
	#else
	if (getenv("ethaddr") == NULL)
	setenv((char )"ethaddr", (char )valbuf);
	#endif

	/* IVM_MacCount */
	count = (buf[10] << 24) +
	(buf[11] << 16) +
	(buf[12] << 8) +
	buf[13];
	if (count == 0xffffffff)
	count = 1;
	sprintf((char *)valbuf, "%lx", count);
	ivm_set_value("IVM_MacCount", (char *)valbuf);
	return 0;
	}

	int ivm_analyze_eeprom(unsigned char *buf, int len)
	{
	unsigned short val;
	unsigned char valbuf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN];
	unsigned char *tmp;

	if (ivm_check_crc(buf, 0) != 0)
	return -1;

	ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
	"IVM_BoardId", 0, 1);
	val = ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
	"IVM_HWKey", 6, 1);
	if (val != 0xffff) {
	sprintf((char *)valbuf, "%x", ((val / 100) % 10));
	ivm_set_value("IVM_HWVariant", (char *)valbuf);
	sprintf((char *)valbuf, "%x", (val % 100));
	ivm_set_value("IVM_HWVersion", (char *)valbuf);
	}
	ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
	"IVM_Functions", 12, 0);

	GET_STRING("IVM_Symbol", IVM_POS_SYMBOL_ONLY, 8)
	GET_STRING("IVM_DeviceName", IVM_POS_SHORT_TEXT, 64)
	tmp = (unsigned char *) getenv("IVM_DeviceName");
	if (tmp) {
	int len = strlen((char *)tmp);
	int i = 0;

	while (i < len) {
	if (tmp[i] == ';') {
	ivm_set_value("IVM_ShortText",
	(char *)&tmp[i + 1]);
	break;
	}
	i++;
	}
	if (i >= len)
	ivm_set_value("IVM_ShortText", NULL);
	} else {
	ivm_set_value("IVM_ShortText", NULL);
	}
	GET_STRING("IVM_ManufacturerID", IVM_POS_MANU_ID, 32)
	GET_STRING("IVM_ManufacturerSerialNumber", IVM_POS_MANU_SERIAL, 20)
	GET_STRING("IVM_ManufacturerPartNumber", IVM_POS_PART_NUMBER, 32)
	GET_STRING("IVM_ManufacturerBuildState", IVM_POS_BUILD_STATE, 32)
	GET_STRING("IVM_SupplierPartNumber", IVM_POS_SUPPLIER_PART_NUMBER, 32)
	GET_STRING("IVM_DelieveryDate", IVM_POS_DELIVERY_DATE, 32)
	GET_STRING("IVM_SupplierBuildState", IVM_POS_SUPPLIER_BUILD_STATE, 32)
	GET_STRING("IVM_CustomerID", IVM_POS_CUSTOMER_ID, 32)
	GET_STRING("IVM_CustomerProductID", IVM_POS_CUSTOMER_PROD_ID, 32)

	if (ivm_check_crc(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2], 2) != 0)
	return 0;
	ivm_analyze_block2(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2],
	CONFIG_SYS_IVM_EEPROM_PAGE_LEN);

	return 0;
	}

	int ivm_read_eeprom(void)
	{
	#if defined(CONFIG_I2C_MUX)
	I2C_MUX_DEVICE *dev = NULL;
	#endif
	uchar i2c_buffer[CONFIG_SYS_IVM_EEPROM_MAX_LEN];
	uchar *buf;
	unsigned long dev_addr = CONFIG_SYS_IVM_EEPROM_ADR;
	int ret;

	#if defined(CONFIG_I2C_MUX)
	/* First init the Bus, select the Bus */
	#if defined(CONFIG_SYS_I2C_IVM_BUS)
	dev = i2c_mux_ident_muxstring((uchar *)CONFIG_SYS_I2C_IVM_BUS);
	#else
	buf = (unsigned char *) getenv("EEprom_ivm");
	if (buf != NULL)
	dev = i2c_mux_ident_muxstring(buf);
	#endif
	if (dev == NULL) {
	printf("Error couldnt add Bus for IVM\n");
	return -1;
	}
	i2c_set_bus_num(dev->busid);
	#endif

	buf = (unsigned char *) getenv("EEprom_ivm_addr");
	if (buf != NULL) {
	ret = strict_strtoul((char *)buf, 16, &dev_addr);
	if (ret != 0)
	return -3;
	}

	/* add deblocking here */
	i2c_make_abort();

	ret = i2c_read(dev_addr, 0, 1, i2c_buffer,
	CONFIG_SYS_IVM_EEPROM_MAX_LEN);
	if (ret != 0) {
	printf("Error reading EEprom\n");
	return -2;
	}

	return ivm_analyze_eeprom(i2c_buffer, CONFIG_SYS_IVM_EEPROM_MAX_LEN);
	}