On 20 Mar 2018 at 13:09, Andrew Lunn wrote: > > i2cdetect has found three i2c slaves (identical layout in both SFP's) > > at addresses 0x50, 0x51 and 0x56. > > What are they? EEPROM, DDM and "MDIO over i2c" ? > > The SFP's likely lack a proper SFP MSA data structure. > > 0x50 and 0x51 are EEPROM like. See drivers/net/phy/sfp.c. The standard > at24 EEPROM driver can also read it. And so should the SFP code in the > igb driver! > Yes - "should" is the right way to put it.
Looking around, I'm wondering how much general-purpose hardware gets sold with an Intel gigabit chip and SFP sockets. Note: sockets for actual SFP's, rather than SFP-size transceivers soldered onboard (and hardwired in the i210 config EEPROM). It took me quite a while to find such a board from DeLock. I mean to say that I doubt how much actual testing on humans this i2c code has enjoyed :-) but admittedly I'm being cheeky here, I haven't reviewed that part of the driver. Frank
