Developer Manual/I2C

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The wiki is being retired!

Documentation is now handled by the same processes we use for code: Add something to the Documentation/ directory in the coreboot repo, and it will be rendered to Contributions welcome!


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 Developer Manual/RAM init.

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

  • sensors-detect (lm-sensors)
  • i2cdetect (i2c-tools)
  • i2cdump (i2c-tools)

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