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 https://doc.coreboot.org/. Contributions welcome!
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This is work in progress!
Serial output and the Super I/O
The Super I/O is a chip found on most of today's mainboards which is — among other things — responsible for the serial ports of the mainboard (e.g. COM1, COM2). This chip usually the first thing you'll want to support, as it's required to get serial debugging output from the mainboard (via a null-modem cable and the proper software, e.g. minicom).
- Understanding DDR Serial Presence Detect (SPD) Table
- Micron 512 MB SDRAM Datasheet (PDF) -- contains some helpful explanations