Hi all, My topic for SUSE Hackweek 16 is to add support for DDR4 memory modules to decode-dimms: https://hackweek.suse.com/16/projects/add-support-for-ddr4-to-decode-dimms I naively thought it would only be about modifying the perl script to decode new fields and new values from the SPD EEPROM, however it turns out that the EEPROM themselves are different. Instead of regular 24C02-style 256-byte EEPROMs, DDR4 memory modules use 512-byte EEPROMs. The trick is that they still use only 1 I2C address each in the 0x50-0x57 range. You have to tinker with special commands in the 0x30-0x37 range to select one of 2 256-byte pages that will be reachable through the 0x50-0x57 I2C address. And as far as I can, it switched all EEPROMs at once, which won't be easy to implement. The standard in question is JEDEC EE1004. I'm not sure if we should add support to the at24 driver, or write a separate driver for such EEPROMs. Before I start working on that, I would like to ask if anybody is already working on it? Thanks, -- Jean Delvare SUSE L3 Support
