hi, can we use the tlv_parser tool to set the eeprom mac address fields instead of doing this in u-boot? in u-boot we are doing something like: tlv_eeprom set 0x24 FA:00:E7:00:FF:F8 tlv_eeprom set 0x2a 0x0A tlv_eeprom write but tlv_parser expects different params: # tlv_parser Usage: tlv_par…

tlv_parser is only written to read from the eeprom in Linux userspace. Onie does have a tlv parser, but I have not tested it on the lx2160a.

Thanks. Any idea how to read the eeprom? what do I provide as i2c bus num?

any idea? # ./tlv_parser -b 0 -a 0x57 ioctl error while reading data from I2C bus - No such device or address Can…

Could be permissions, are you running it as root. It is possible your i2c bus is enumerated differently. You can use the i2cdump utility to check the devices on each bus.

# i2cdump 0 0x57 b Error: Could not set address to 0x57: Device or resource busy # i2cdetect -y 0 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- …

I do find 0x57 on bus 2 but tlv_parser doesn’t seem to like it either: # i2cdetect -y 2 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- …

This is the correct eeprom, but the tlv_parser code can not read it because the eeprom kernel driver has control over the device. You can disable the device in the device-tree and then access it from this utility, otherwise you would need to modify the tool to read the eeprom contents directly from…

Thanks, got it to work: # /root/tlv_parser -b 3 -a 0x57 EEPROM Contents: Product Name: LX2160A_CEX7 ... I’m thinking to expand tlv_parser with code for writing the EEPROM, too, so I can change the mac address from user space (for production line). do you think there’s any reason wh…

Should work fine. As long as the TLV is written in the correct format with the proper CRC entry it does not matter where the device is programmed.

Tlv_parser to set eeprom mac addr

NXP LX2160

jnettlet April 30, 2024, 8:41am 4

It is device 0x57 on i2c bus 0. You can find the information from our schematics, or the device-tree.

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Tlv_parser to set eeprom mac addr

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