mirror of
https://github.com/smaeul/u-boot.git
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123 lines
3.6 KiB
C
123 lines
3.6 KiB
C
/*
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* (C) Copyright 2000, 2001, 2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2005
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* Martin Krause, TQ-Systems GmbH, martin.krause@tqs.de
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/* #define DEBUG */
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#include <common.h>
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#define I2C_CHIP 0x50 /* I2C bus address of onboard EEPROM */
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#define I2C_ALEN 1 /* length of EEPROM addresses in bytes */
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#define I2C_OFFSET 0x0 /* start address of manufacturere data block
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* in EEPROM */
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/* 64 Byte manufacturer data block in EEPROM */
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struct manufacturer_data {
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unsigned int serial_number; /* serial number (0...999999) */
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unsigned short hardware; /* hardware version (e.g. V1.02) */
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unsigned short manuf_date; /* manufacture date (e.g. 25/02) */
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unsigned char name[20]; /* device name (in CHIP.INI) */
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unsigned char macadr[6]; /* MAC address */
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signed char a_kal[4]; /* calibration value for U */
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signed char i_kal[4]; /* calibration value for I */
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unsigned char reserve[18]; /* reserved */
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unsigned short save_nr; /* save count */
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unsigned short chksum; /* checksum */
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};
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int i2c_read (unsigned char chip, unsigned int addr, int alen,
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unsigned char *buffer, int len);
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/*-----------------------------------------------------------------------
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* Process manufacturer data block in EEPROM:
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*
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* If we boot on a system fresh from factory, check if the manufacturer data
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* in the EEPROM is valid and save some information it contains.
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*
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* CMC manufacturer data is defined as follows:
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*
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* - located in the onboard EEPROM
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* - starts at offset 0x0
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* - size 0x00000040
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*
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* Internal structure: see struct definition
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*/
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void load_sernum_ethaddr (void)
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{
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struct manufacturer_data data;
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char ethaddr[18];
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char serial [9];
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unsigned short chksum;
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unsigned char *p;
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unsigned short i, is, id;
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#if !defined(CONFIG_HARD_I2C) && !defined(CONFIG_SOFT_I2C)
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#error you must define some I2C support (CONFIG_HARD_I2C or CONFIG_SOFT_I2C)
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#endif
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if (i2c_read(I2C_CHIP, I2C_OFFSET, I2C_ALEN, (unsigned char *)&data,
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sizeof(data)) != 0) {
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puts ("Error reading manufacturer data from EEPROM\n");
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return;
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}
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/* check if manufacturer data block is valid */
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p = (unsigned char *)&data;
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chksum = 0;
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for (i = 0; i < (sizeof(data) - sizeof(data.chksum)); i++)
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chksum += *p++;
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debug ("checksum of manufacturer data block: %#.4x\n", chksum);
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if (chksum != data.chksum) {
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puts ("Error: manufacturer data block has invalid checksum\n");
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return;
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}
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/* copy MAC address */
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is = 0;
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id = 0;
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for (i = 0; i < 6; i++) {
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sprintf (ðaddr[id], "%02x", data.macadr[is++]);
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id += 2;
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if (is < 6)
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ethaddr[id++] = ':';
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}
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ethaddr[id] = '\0'; /* just to be sure */
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/* copy serial number */
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sprintf (serial, "%d", data.serial_number);
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/* set serial# and ethaddr if not yet defined */
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if (getenv("serial#") == NULL) {
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setenv ("serial#", serial);
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}
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if (getenv("ethaddr") == NULL) {
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setenv ("ethaddr", ethaddr);
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}
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}
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