Artesyn COMX-P40x0 ENP2 Installation and Use (August 2014) - Manual (Page 101)

BSP
COMX-P40x0 ENP2 Installation and Use (6806800R95B) 101
I2C buses in the U-Boot have been re-assigned as follows:
The devices displayed via the "i2c probe" command are 7-bit I2C addresses. The addresses
found in the HW
Table 4-8 on page 75 are 8-bit addresses. (For example: 7-bit address 0x18
corresponds to the 8-bit address 0x30)
7.15.1 ID EEPROM
An I2C EEPROM AT24C02 (U30) is used as the ID EEPROM, located on I2C<1>. COMX-P40x0
uses ID EEPROM to store the board’s serial number, number of network ports, MAC addresses,
errata level, manufacturing date and other information. Boot up message in the U-Boot will be:
"EEPROM: NXID v0".
U-Boot provides several "mac" utilities to display and program the data in ID EEPROM.
i2c read chip address[.0, .1, .2] length
memaddress Reads to memory
i2c reset Re-inititializes the I2C Controller
i2c speed [speed] Shows or set I2C bus speed
’i2c dev 0’ selects I2C<1>
’i2c dev 1’ selects I2C<2>
’i2c dev 2’ selects I2C<4>
Table 7-8 U-Boot I2C Utilities
Utility Description
mac [read|save|id|num|errata|date|ports|0|1|2|3|4|5|6|7]
mac read Shows content of EEPROM
mac save Saves to the EEPROM
mac id Programs system id
mac num Programs system serial number