Developer Manual/I2C

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SMBUS and I2C are closely related buses. The SPD (Serial Presence Detect) of the DIMM's are I2C devices that need to be read during RAM initialisation.

For characterizing I2C on a unsupported motherboard I used the following tools:

  • sensors-detect (lm-sensors)
  • i2cdetect
  • i2cdump

Using this tools on a normal bios on the motherboard its easy to identify the appropriate address for the SPD data.