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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 https://doc.coreboot.org/. 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)
Using this tools on a normal bios on the motherboard its easy to identify the appropriate address for the SPD data.