The log says "kernel: eeprom 3-0050: eeprom driver is deprecated, please use at24 instead", but decode-dimms will only work with the deprecated eeprom driver. With the at24 module, "Number of SDRAM DIMMs detected and decoded: 0". With the eeprom module, "Number of SDRAM DIMMs detected and decoded: 6". This is on Arch Linux, with linux 5.5.9.arch1-2, on an old Asus P6T DELUXE V2 with a Core i7.
