board/matrix_vision/mvblx/sys_eeprom.c - filogic/uboot - Gitiles

 /*
  * Copyright 2006, 2008-2009, 2011 Freescale Semiconductor
  * York Sun (yorksun@freescale.com)
  * Haiying Wang (haiying.wang@freescale.com)
  * Timur Tabi (timur@freescale.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 <command.h>
 #include <i2c.h>

 /* #define DEBUG */

 /*
  * static eeprom: EEPROM layout
  */
 static struct __attribute__ ((__packed__)) eeprom {
 	u8 id[16];		/* 0x01 - 0x0F Type e.g. 100wG-5111 */
 	u8 sn[10];		/* 0x10 - 0x19 Serial Number */
 	u8 date[6];		/* 0x1A - 0x1F Build Date */
 	u8 mac[6];		/* 0x20 - 0x25 MAC address  */
 	u8 reserved[10];/* 0x26 - 0x2f reserved */
 	u32 crc;        /* x+1         CRC32 checksum */
 } e;

 /* Set to 1 if we've read EEPROM into memory */
 static int has_been_read;

 /**
  * show_eeprom - display the contents of the EEPROM
  */
 static void show_eeprom(void)
 {
 	unsigned int crc;
 	char safe_string[16];

 #ifdef DEBUG
 	int i;
 #endif
 	u8 *p;

 	/* ID */
 	strncpy(safe_string, (char *)e.id, sizeof(e.id));
 	safe_string[sizeof(e.id)-1] = 0;
 	printf("ID: mvBlueLYNX-X%s\n", safe_string);

 	/* Serial number */
 	strncpy(safe_string, (char *)e.sn, sizeof(e.sn));
 	safe_string[sizeof(e.sn)-1] = 0;
 	printf("SN: %s\n", safe_string);

 	/* Build date, BCD date values, as YYMMDDhhmmss */
 	printf("Build date: 20%02x/%02x/%02x %02x:%02x:%02x %s\n",
 		e.date[0], e.date[1], e.date[2],
 		e.date[3] & 0x7F, e.date[4], e.date[5],
 		e.date[3] & 0x80 ? "PM" : "");

 	/* Show MAC address  */
 	p = e.mac;
 	printf("Eth: %02x:%02x:%02x:%02x:%02x:%02x\n",
 		p[0], p[1], p[2], p[3],	p[4], p[5]);

 	crc = crc32(0, (void *)&e, sizeof(e) - 4);

 	if (crc == be32_to_cpu(e.crc))
 		printf("CRC: %08x\n", be32_to_cpu(e.crc));
 	else
 		printf("CRC: %08x (should be %08x)\n", be32_to_cpu(e.crc), crc);

 #ifdef DEBUG
 	printf("EEPROM dump: (0x%x bytes)\n", sizeof(e));
 	for (i = 0; i < sizeof(e); i++) {
 		if ((i % 16) == 0)
 			printf("%02X: ", i);
 		printf("%02X ", ((u8 *)&e)[i]);
 		if (((i % 16) == 15) || (i == sizeof(e) - 1))
 			printf("\n");
 	}
 #endif
 }

 /**
  * read_eeprom - read the EEPROM into memory
  */
 static int read_eeprom(void)
 {
 	int ret;
 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 	unsigned int bus;
 #endif

 	if (has_been_read)
 		return 0;

 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 	bus = i2c_get_bus_num();
 	i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
 #endif

 	ret = eeprom_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
 		(uchar *)&e, sizeof(e));

 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 	i2c_set_bus_num(bus);
 #endif

 #ifdef DEBUG
 	show_eeprom();
 #endif

 	has_been_read = (ret == 0) ? 1 : 0;

 	return ret;
 }

 /**
  *  update_crc - update the CRC
  *
  *  This function should be called after each update to the EEPROM structure,
  *  to make sure the CRC is always correct.
  */
 static void update_crc(void)
 {
 	u32 crc;

 	crc = crc32(0, (void *)&e, sizeof(e) - 4);
 	e.crc = cpu_to_be32(crc);
 }

 /**
  * prog_eeprom - write the EEPROM from memory
  */
 static int prog_eeprom(void)
 {
 	int ret = 0;
 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 	unsigned int bus;
 #endif

 	update_crc();

 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 	bus = i2c_get_bus_num();
 	i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
 #endif

 	ret = eeprom_write(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
 		(uchar *)&e, sizeof(e));

 	if (!ret) {
 		/* Verify the write by reading back the EEPROM and comparing */
 		struct eeprom e2;
 #ifdef DEBUG
 		printf("%s verifying...\n", __func__);
 #endif
 		ret = eeprom_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
 			(uchar *)&e2, sizeof(e2));

 		if (!ret && memcmp(&e, &e2, sizeof(e)))
 			ret = -1;
 	}

 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 	i2c_set_bus_num(bus);
 #endif

 	if (ret) {
 		printf("Programming failed.\n");
 		has_been_read = 0;
 		return -1;
 	}

 	printf("Programming passed.\n");
 	return 0;
 }

 /**
  * h2i - converts hex character into a number
  *
  * This function takes a hexadecimal character (e.g. '7' or 'C') and returns
  * the integer equivalent.
  */
 static inline u8 h2i(char p)
 {
 	if ((p >= '0') && (p <= '9'))
 		return p - '0';

 	if ((p >= 'A') && (p <= 'F'))
 		return (p - 'A') + 10;

 	if ((p >= 'a') && (p <= 'f'))
 		return (p - 'a') + 10;

 	return 0;
 }

 /**
  * set_date - stores the build date into the EEPROM
  *
  * This function takes a pointer to a string in the format "YYMMDDhhmmss"
  * (2-digit year, 2-digit month, etc), converts it to a 6-byte BCD string,
  * and stores it in the build date field of the EEPROM local copy.
  */
 static void set_date(const char *string)
 {
 	unsigned int i;

 	if (strlen(string) != 12) {
 		printf("Usage: mac date YYMMDDhhmmss\n");
 		return;
 	}

 	for (i = 0; i < 6; i++)
 		e.date[i] = h2i(string[2 * i]) << 4 | h2i(string[2 * i + 1]);

 	update_crc();
 }

 /**
  * set_mac_address - stores a MAC address into the EEPROM
  *
  * This function takes a pointer to MAC address string
  * (i.e."XX:XX:XX:XX:XX:XX", where "XX" is a two-digit hex number) and
  * stores it in the MAC address field in the EEPROM local copy.
  */
 static void set_mac_address(const char *string)
 {
 	char *p = (char *) string;
 	unsigned int i;

 	for (i = 0; *p && (i < 6); i++) {
 		e.mac[i] = simple_strtoul(p, &p, 16);
 		if (*p == ':')
 			p++;
 	}

 	update_crc();
 }

 int do_mac(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	char cmd;

 	if (argc == 1) {
 		show_eeprom();
 		return 0;
 	}

 	cmd = argv[1][0];

 	if (cmd == 'r') {
 #ifdef DEBUG
 		printf("%s read\n", __func__);
 #endif
 		read_eeprom();
 		return 0;
 	}

 	if (argc == 2) {
 		switch (cmd) {
 		case 's':	/* save */
 #ifdef DEBUG
 			printf("%s save\n", __func__);
 #endif
 			prog_eeprom();
 			break;
 		default:
 			return cmd_usage(cmdtp);
 		}

 		return 0;
 	}

 	/* We know we have at least one parameter  */

 	switch (cmd) {
 	case 'n':	/* serial number */
 #ifdef DEBUG
 		printf("%s serial number\n", __func__);
 #endif
 		memset(e.sn, 0, sizeof(e.sn));
 		strncpy((char *)e.sn, argv[2], sizeof(e.sn) - 1);
 		update_crc();
 		break;
 	case 'd':	/* date BCD format YYMMDDhhmmss */
 		set_date(argv[2]);
 		break;
 	case 'e':	/* errata */
 		printf("mac errata not implemented\n");
 		break;
 	case 'i':	/* id */
 		memset(e.id, 0, sizeof(e.id));
 		strncpy((char *)e.id, argv[2], sizeof(e.id) - 1);
 		update_crc();
 		break;
 	case 'p':	/* ports */
 		printf("mac ports not implemented (always 1 port)\n");
 		break;
 	case '0' ... '9':
 		/* we only have "mac 0" but any digit can be used here */
 		set_mac_address(argv[2]);
 		break;
 	case 'h':	/* help */
 	default:
 		return cmd_usage(cmdtp);
 	}

 	return 0;
 }

 static inline int is_portrait(void)
 {
 	int i;
 	unsigned int orient_index = 0; /* idx of char which determines orientation */

 	for (i = sizeof(e.id)/sizeof(*e.id) - 1; i>=0; i--) {
 		if (e.id[i] == '-') {
 			orient_index = i+1;
 			break;
 		}
 	}

 	return (orient_index &&
 			(e.id[orient_index] >= '5') && (e.id[orient_index] <= '8'));
 }

 int mac_read_from_eeprom(void)
 {
 	u32 crc, crc_offset = offsetof(struct eeprom, crc);
 	u32 *crcp; /* Pointer to the CRC in the data read from the EEPROM */
 #define FILENAME_LANDSCAPE "mvBlueLynx_X.rbf"
 #define FILENAME_PORTRAIT "mvBlueLynx_X_sensor_cd.rbf"

 	if (read_eeprom()) {
 		printf("EEPROM Read failed.\n");
 		return -1;
 	}

 	crc = crc32(0, (void *)&e, crc_offset);
 	crcp = (void *)&e + crc_offset;
 	if (crc != be32_to_cpu(*crcp)) {
 		printf("EEPROM CRC mismatch (%08x != %08x)\n", crc,
 			be32_to_cpu(e.crc));
 		return -1;
 	}

 	if (memcmp(&e.mac, "\0\0\0\0\0\0", 6) &&
 		memcmp(&e.mac, "\xFF\xFF\xFF\xFF\xFF\xFF", 6)) {
 		char ethaddr[9];

 		sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
 			e.mac[0],
 			e.mac[1],
 			e.mac[2],
 			e.mac[3],
 			e.mac[4],
 			e.mac[5]);
 		/* Only initialize environment variables that are blank
 		 * (i.e. have not yet been set)
 		 */
 		if (!getenv("ethaddr"))
 			setenv("ethaddr", ethaddr);
 	}

 	if (memcmp(&e.sn, "\0\0\0\0\0\0\0\0\0\0", 10) &&
 		memcmp(&e.sn, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 10)) {
 		char serial_num[12];

 		strncpy(serial_num, (char *)e.sn, sizeof(e.sn) - 1);
 		/* Only initialize environment variables that are blank
 		 * (i.e. have not yet been set)
 		 */
 		if (!getenv("serial#"))
 			setenv("serial#", serial_num);
 	}

 	/* decide which fpga file to load depending on orientation */
 	if (is_portrait())
 		setenv("fpgafilename", FILENAME_PORTRAIT);
 	else
 		setenv("fpgafilename", FILENAME_LANDSCAPE);

 	/* TODO should I calculate CRC here? */
 	return 0;
 }

 #ifdef CONFIG_SERIAL_TAG
 void get_board_serial(struct tag_serialnr *serialnr)
 {
 	char *serial = getenv("serial#");

 	if (serial && (strlen(serial) > 3)) {
 		/* use the numerical part of the serial number LXnnnnnn */
 		serialnr->high = 0;
 		serialnr->low = simple_strtoul(serial + 2, NULL, 10);
 	} else {
 		serialnr->high = 0;
 		serialnr->low = 0;
 	}
 }
 #endif
	/*
	* Copyright 2006, 2008-2009, 2011 Freescale Semiconductor
	* York Sun (yorksun@freescale.com)
	* Haiying Wang (haiying.wang@freescale.com)
	* Timur Tabi (timur@freescale.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 <command.h>
	#include <i2c.h>

	/* #define DEBUG */

	/*
	* static eeprom: EEPROM layout
	*/
	static struct __attribute__ ((__packed__)) eeprom {
	u8 id[16]; /* 0x01 - 0x0F Type e.g. 100wG-5111 */
	u8 sn[10]; /* 0x10 - 0x19 Serial Number */
	u8 date[6]; /* 0x1A - 0x1F Build Date */
	u8 mac[6]; /* 0x20 - 0x25 MAC address */
	u8 reserved[10];/* 0x26 - 0x2f reserved */
	u32 crc; /* x+1 CRC32 checksum */
	} e;

	/* Set to 1 if we've read EEPROM into memory */
	static int has_been_read;

	/**
	* show_eeprom - display the contents of the EEPROM
	*/
	static void show_eeprom(void)
	{
	unsigned int crc;
	char safe_string[16];

	#ifdef DEBUG
	int i;
	#endif
	u8 *p;

	/* ID */
	strncpy(safe_string, (char *)e.id, sizeof(e.id));
	safe_string[sizeof(e.id)-1] = 0;
	printf("ID: mvBlueLYNX-X%s\n", safe_string);

	/* Serial number */
	strncpy(safe_string, (char *)e.sn, sizeof(e.sn));
	safe_string[sizeof(e.sn)-1] = 0;
	printf("SN: %s\n", safe_string);

	/* Build date, BCD date values, as YYMMDDhhmmss */
	printf("Build date: 20%02x/%02x/%02x %02x:%02x:%02x %s\n",
	e.date[0], e.date[1], e.date[2],
	e.date[3] & 0x7F, e.date[4], e.date[5],
	e.date[3] & 0x80 ? "PM" : "");

	/* Show MAC address */
	p = e.mac;
	printf("Eth: %02x:%02x:%02x:%02x:%02x:%02x\n",
	p[0], p[1], p[2], p[3], p[4], p[5]);

	crc = crc32(0, (void *)&e, sizeof(e) - 4);

	if (crc == be32_to_cpu(e.crc))
	printf("CRC: %08x\n", be32_to_cpu(e.crc));
	else
	printf("CRC: %08x (should be %08x)\n", be32_to_cpu(e.crc), crc);

	#ifdef DEBUG
	printf("EEPROM dump: (0x%x bytes)\n", sizeof(e));
	for (i = 0; i < sizeof(e); i++) {
	if ((i % 16) == 0)
	printf("%02X: ", i);
	printf("%02X ", ((u8 *)&e)[i]);
	if (((i % 16) == 15) \|\| (i == sizeof(e) - 1))
	printf("\n");
	}
	#endif
	}

	/**
	* read_eeprom - read the EEPROM into memory
	*/
	static int read_eeprom(void)
	{
	int ret;
	#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	unsigned int bus;
	#endif

	if (has_been_read)
	return 0;

	#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	bus = i2c_get_bus_num();
	i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
	#endif

	ret = eeprom_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
	(uchar *)&e, sizeof(e));

	#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	i2c_set_bus_num(bus);
	#endif

	#ifdef DEBUG
	show_eeprom();
	#endif

	has_been_read = (ret == 0) ? 1 : 0;

	return ret;
	}

	/**
	* update_crc - update the CRC
	*
	* This function should be called after each update to the EEPROM structure,
	* to make sure the CRC is always correct.
	*/
	static void update_crc(void)
	{
	u32 crc;

	crc = crc32(0, (void *)&e, sizeof(e) - 4);
	e.crc = cpu_to_be32(crc);
	}

	/**
	* prog_eeprom - write the EEPROM from memory
	*/
	static int prog_eeprom(void)
	{
	int ret = 0;
	#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	unsigned int bus;
	#endif

	update_crc();

	#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	bus = i2c_get_bus_num();
	i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
	#endif

	ret = eeprom_write(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
	(uchar *)&e, sizeof(e));

	if (!ret) {
	/* Verify the write by reading back the EEPROM and comparing */
	struct eeprom e2;
	#ifdef DEBUG
	printf("%s verifying...\n", __func__);
	#endif
	ret = eeprom_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
	(uchar *)&e2, sizeof(e2));

	if (!ret && memcmp(&e, &e2, sizeof(e)))
	ret = -1;
	}

	#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	i2c_set_bus_num(bus);
	#endif

	if (ret) {
	printf("Programming failed.\n");
	has_been_read = 0;
	return -1;
	}

	printf("Programming passed.\n");
	return 0;
	}

	/**
	* h2i - converts hex character into a number
	*
	* This function takes a hexadecimal character (e.g. '7' or 'C') and returns
	* the integer equivalent.
	*/
	static inline u8 h2i(char p)
	{
	if ((p >= '0') && (p <= '9'))
	return p - '0';

	if ((p >= 'A') && (p <= 'F'))
	return (p - 'A') + 10;

	if ((p >= 'a') && (p <= 'f'))
	return (p - 'a') + 10;

	return 0;
	}

	/**
	* set_date - stores the build date into the EEPROM
	*
	* This function takes a pointer to a string in the format "YYMMDDhhmmss"
	* (2-digit year, 2-digit month, etc), converts it to a 6-byte BCD string,
	* and stores it in the build date field of the EEPROM local copy.
	*/
	static void set_date(const char *string)
	{
	unsigned int i;

	if (strlen(string) != 12) {
	printf("Usage: mac date YYMMDDhhmmss\n");
	return;
	}

	for (i = 0; i < 6; i++)
	e.date[i] = h2i(string[2 * i]) << 4 \| h2i(string[2 * i + 1]);

	update_crc();
	}

	/**
	* set_mac_address - stores a MAC address into the EEPROM
	*
	* This function takes a pointer to MAC address string
	* (i.e."XX:XX:XX:XX:XX:XX", where "XX" is a two-digit hex number) and
	* stores it in the MAC address field in the EEPROM local copy.
	*/
	static void set_mac_address(const char *string)
	{
	char p = (char ) string;
	unsigned int i;

	for (i = 0; *p && (i < 6); i++) {
	e.mac[i] = simple_strtoul(p, &p, 16);
	if (*p == ':')
	p++;
	}

	update_crc();
	}

	int do_mac(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
	{
	char cmd;

	if (argc == 1) {
	show_eeprom();
	return 0;
	}

	cmd = argv[1][0];

	if (cmd == 'r') {
	#ifdef DEBUG
	printf("%s read\n", __func__);
	#endif
	read_eeprom();
	return 0;
	}

	if (argc == 2) {
	switch (cmd) {
	case 's': /* save */
	#ifdef DEBUG
	printf("%s save\n", __func__);
	#endif
	prog_eeprom();
	break;
	default:
	return cmd_usage(cmdtp);
	}

	return 0;
	}

	/* We know we have at least one parameter */

	switch (cmd) {
	case 'n': /* serial number */
	#ifdef DEBUG
	printf("%s serial number\n", __func__);
	#endif
	memset(e.sn, 0, sizeof(e.sn));
	strncpy((char *)e.sn, argv[2], sizeof(e.sn) - 1);
	update_crc();
	break;
	case 'd': /* date BCD format YYMMDDhhmmss */
	set_date(argv[2]);
	break;
	case 'e': /* errata */
	printf("mac errata not implemented\n");
	break;
	case 'i': /* id */
	memset(e.id, 0, sizeof(e.id));
	strncpy((char *)e.id, argv[2], sizeof(e.id) - 1);
	update_crc();
	break;
	case 'p': /* ports */
	printf("mac ports not implemented (always 1 port)\n");
	break;
	case '0' ... '9':
	/* we only have "mac 0" but any digit can be used here */
	set_mac_address(argv[2]);
	break;
	case 'h': /* help */
	default:
	return cmd_usage(cmdtp);
	}

	return 0;
	}

	static inline int is_portrait(void)
	{
	int i;
	unsigned int orient_index = 0; /* idx of char which determines orientation */

	for (i = sizeof(e.id)/sizeof(*e.id) - 1; i>=0; i--) {
	if (e.id[i] == '-') {
	orient_index = i+1;
	break;
	}
	}

	return (orient_index &&
	(e.id[orient_index] >= '5') && (e.id[orient_index] <= '8'));
	}

	int mac_read_from_eeprom(void)
	{
	u32 crc, crc_offset = offsetof(struct eeprom, crc);
	u32 crcp; / Pointer to the CRC in the data read from the EEPROM */
	#define FILENAME_LANDSCAPE "mvBlueLynx_X.rbf"
	#define FILENAME_PORTRAIT "mvBlueLynx_X_sensor_cd.rbf"

	if (read_eeprom()) {
	printf("EEPROM Read failed.\n");
	return -1;
	}

	crc = crc32(0, (void *)&e, crc_offset);
	crcp = (void *)&e + crc_offset;
	if (crc != be32_to_cpu(*crcp)) {
	printf("EEPROM CRC mismatch (%08x != %08x)\n", crc,
	be32_to_cpu(e.crc));
	return -1;
	}

	if (memcmp(&e.mac, "\0\0\0\0\0\0", 6) &&
	memcmp(&e.mac, "\xFF\xFF\xFF\xFF\xFF\xFF", 6)) {
	char ethaddr[9];

	sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
	e.mac[0],
	e.mac[1],
	e.mac[2],
	e.mac[3],
	e.mac[4],
	e.mac[5]);
	/* Only initialize environment variables that are blank
	* (i.e. have not yet been set)
	*/
	if (!getenv("ethaddr"))
	setenv("ethaddr", ethaddr);
	}

	if (memcmp(&e.sn, "\0\0\0\0\0\0\0\0\0\0", 10) &&
	memcmp(&e.sn, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 10)) {
	char serial_num[12];

	strncpy(serial_num, (char *)e.sn, sizeof(e.sn) - 1);
	/* Only initialize environment variables that are blank
	* (i.e. have not yet been set)
	*/
	if (!getenv("serial#"))
	setenv("serial#", serial_num);
	}

	/* decide which fpga file to load depending on orientation */
	if (is_portrait())
	setenv("fpgafilename", FILENAME_PORTRAIT);
	else
	setenv("fpgafilename", FILENAME_LANDSCAPE);

	/* TODO should I calculate CRC here? */
	return 0;
	}

	#ifdef CONFIG_SERIAL_TAG
	void get_board_serial(struct tag_serialnr *serialnr)
	{
	char *serial = getenv("serial#");

	if (serial && (strlen(serial) > 3)) {
	/* use the numerical part of the serial number LXnnnnnn */
	serialnr->high = 0;
	serialnr->low = simple_strtoul(serial + 2, NULL, 10);
	} else {
	serialnr->high = 0;
	serialnr->low = 0;
	}
	}
	#endif