board/keymile/common/ivm.c - filogic/uboot - Gitiles

 /*
  * (C) Copyright 2011
  * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <cli_hush.h>
 #include <i2c.h>
 #include "common.h"

 #define MAC_STR_SZ	20

 static 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;
 }

 /* take care of the possible MAC address offset and the IVM content offset */
 static int process_mac(unsigned char *valbuf, unsigned char *buf,
 				int offset)
 {
 	unsigned char mac[6];
 	unsigned long val = (buf[4] << 16) + (buf[5] << 8) + buf[6];

 	/* use an intermediate buffer, to not change IVM content
 	 * MAC address is at offset 1
 	 */
 	memcpy(mac, buf+1, 6);

 	if (offset) {
 		val += offset;
 		mac[3] = (val >> 16) & 0xff;
 		mac[4] = (val >> 8) & 0xff;
 		mac[5] = val & 0xff;
 	}

 	sprintf((char *)valbuf, "%pM", mac);
 	return 0;
 }

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

 	/* IVM_MAC Adress begins at offset 1 */
 	sprintf((char *)valbuf, "%pM", buf + 1);
 	ivm_set_value("IVM_MacAddress", (char *)valbuf);
 	/* 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;
 }

 static int ivm_populate_env(unsigned char *buf, int len)
 {
 	unsigned char	*page2;
 	unsigned char	valbuf[MAC_STR_SZ];

 	/* do we have the page 2 filled ? if not return */
 	if (ivm_check_crc(buf, 2))
 		return 0;
 	page2 = &buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN*2];

 	/* if an offset is defined, add it */
 	process_mac(valbuf, page2, CONFIG_PIGGY_MAC_ADRESS_OFFSET);
 	if (getenv("ethaddr") == NULL)
 		setenv((char *)"ethaddr", (char *)valbuf);
 #ifdef CONFIG_KMVECT1
 /* KMVECT1 has two ethernet interfaces */
 	if (getenv("eth1addr") == NULL) {
 		process_mac(valbuf, page2, 1);
 		setenv((char *)"eth1addr", (char *)valbuf);
 	}
 #endif

 	return 0;
 }

 int ivm_simple_read_eeprom(unsigned char *buf, int len)
 {
 	int ret;

 	i2c_set_bus_num(CONFIG_KM_IVM_BUS);
 	/* add deblocking here */
 	i2c_make_abort();

 	ret = i2c_read(CONFIG_SYS_IVM_EEPROM_ADR, 0, 1, buf, len);
 	if (ret != 0) {
 		printf("Error reading EEprom\n");
 		return -2;
 	}

 	return ivm_populate_env(buf, len);
 }

 int ivm_read_eeprom(void)
 {
 	uchar i2c_buffer[CONFIG_SYS_IVM_EEPROM_MAX_LEN];
 	int ret;

 	i2c_set_bus_num(CONFIG_KM_IVM_BUS);
 	/* add deblocking here */
 	i2c_make_abort();

 	ret = i2c_read(CONFIG_SYS_IVM_EEPROM_ADR, 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
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <cli_hush.h>
	#include <i2c.h>
	#include "common.h"

	#define MAC_STR_SZ 20

	static 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;
	}

	/* take care of the possible MAC address offset and the IVM content offset */
	static int process_mac(unsigned char valbuf, unsigned char buf,
	int offset)
	{
	unsigned char mac[6];
	unsigned long val = (buf[4] << 16) + (buf[5] << 8) + buf[6];

	/* use an intermediate buffer, to not change IVM content
	* MAC address is at offset 1
	*/
	memcpy(mac, buf+1, 6);

	if (offset) {
	val += offset;
	mac[3] = (val >> 16) & 0xff;
	mac[4] = (val >> 8) & 0xff;
	mac[5] = val & 0xff;
	}

	sprintf((char *)valbuf, "%pM", mac);
	return 0;
	}

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

	/* IVM_MAC Adress begins at offset 1 */
	sprintf((char *)valbuf, "%pM", buf + 1);
	ivm_set_value("IVM_MacAddress", (char *)valbuf);
	/* 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;
	}

	static int ivm_populate_env(unsigned char *buf, int len)
	{
	unsigned char *page2;
	unsigned char valbuf[MAC_STR_SZ];

	/* do we have the page 2 filled ? if not return */
	if (ivm_check_crc(buf, 2))
	return 0;
	page2 = &buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN*2];

	/* if an offset is defined, add it */
	process_mac(valbuf, page2, CONFIG_PIGGY_MAC_ADRESS_OFFSET);
	if (getenv("ethaddr") == NULL)
	setenv((char )"ethaddr", (char )valbuf);
	#ifdef CONFIG_KMVECT1
	/* KMVECT1 has two ethernet interfaces */
	if (getenv("eth1addr") == NULL) {
	process_mac(valbuf, page2, 1);
	setenv((char )"eth1addr", (char )valbuf);
	}
	#endif

	return 0;
	}

	int ivm_simple_read_eeprom(unsigned char *buf, int len)
	{
	int ret;

	i2c_set_bus_num(CONFIG_KM_IVM_BUS);
	/* add deblocking here */
	i2c_make_abort();

	ret = i2c_read(CONFIG_SYS_IVM_EEPROM_ADR, 0, 1, buf, len);
	if (ret != 0) {
	printf("Error reading EEprom\n");
	return -2;
	}

	return ivm_populate_env(buf, len);
	}

	int ivm_read_eeprom(void)
	{
	uchar i2c_buffer[CONFIG_SYS_IVM_EEPROM_MAX_LEN];
	int ret;

	i2c_set_bus_num(CONFIG_KM_IVM_BUS);
	/* add deblocking here */
	i2c_make_abort();

	ret = i2c_read(CONFIG_SYS_IVM_EEPROM_ADR, 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);
	}