2 * (C) Copyright 2000, 2001, 2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
6 * Martin Krause, TQ-Systems GmbH, martin.krause@tqs.de
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
31 #define I2C_CHIP 0x50 /* I2C bus address of onboard EEPROM */
32 #define I2C_ALEN 1 /* length of EEPROM addresses in bytes */
33 #define I2C_OFFSET 0x0 /* start address of manufacturere data block
36 /* 64 Byte manufacturer data block in EEPROM */
37 struct manufacturer_data {
38 unsigned int serial_number; /* serial number (0...999999) */
39 unsigned short hardware; /* hardware version (e.g. V1.02) */
40 unsigned short manuf_date; /* manufacture date (e.g. 25/02) */
41 unsigned char name[20]; /* device name (in CHIP.INI) */
42 unsigned char macadr[6]; /* MAC address */
43 signed char a_kal[4]; /* calibration value for U */
44 signed char i_kal[4]; /* calibration value for I */
45 unsigned char reserve[18]; /* reserved */
46 unsigned short save_nr; /* save count */
47 unsigned short chksum; /* checksum */
51 int i2c_read (unsigned char chip, unsigned int addr, int alen,
52 unsigned char *buffer, int len);
54 /*-----------------------------------------------------------------------
55 * Process manufacturer data block in EEPROM:
57 * If we boot on a system fresh from factory, check if the manufacturer data
58 * in the EEPROM is valid and save some information it contains.
60 * CMC manufacturer data is defined as follows:
62 * - located in the onboard EEPROM
63 * - starts at offset 0x0
66 * Internal structure: see struct definition
71 struct manufacturer_data data;
73 unsigned short chksum;
77 #if !defined(CONFIG_HARD_I2C) && !defined(CONFIG_SOFT_I2C)
78 #error you must define some I2C support (CONFIG_HARD_I2C or CONFIG_SOFT_I2C)
80 if (i2c_read(I2C_CHIP, I2C_OFFSET, I2C_ALEN, (unsigned char *)&data,
82 puts ("Error reading manufacturer data from EEPROM\n");
86 /* check if manufacturer data block is valid */
87 p = (unsigned char *)&data;
89 for (i = 0; i < (sizeof(data) - sizeof(data.chksum)); i++)
92 debug ("checksum of manufacturer data block: %#.4x\n", chksum);
94 if (chksum != data.chksum) {
95 puts ("Error: manufacturer data block has invalid checksum\n");
99 /* copy serial number */
100 sprintf (serial, "%d", data.serial_number);
102 /* set serial# and ethaddr if not yet defined */
103 if (getenv("serial#") == NULL) {
104 setenv ("serial#", serial);
107 if (getenv("ethaddr") == NULL) {
108 eth_setenv_enetaddr("ethaddr", data.macadr);