[coreboot] Super I/O: Winbond LPC Super I/O WPCN381U

Peter Stuge peter at stuge.se
Thu Apr 7 17:21:56 CEST 2011

Jeremy Moles wrote:
> Does anyone have any good documentation I can read to learn how to
> interact with (either in userspace or kernel-level) LPC devices,

LPC is directly accessible to the CPU, so you use outb and inb to
make IO accesses.

> specifically the PC87381 Super I/O device? Perhaps there's some code
> in coreboot demonstrating how GPIO ports are manipulated?

Look at what superiotool does, and/or use isaset from lm-sensors.


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