On Mon, 30 Jul 2007 00:08:59 -0400
Michael Lorenz <macallan@netbsd.org> wrote:

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> Hello,
> 
> On Jul 29, 2007, at 23:34, Daniel Carosone wrote:
> 
> > On Mon, Jul 30, 2007 at 05:29:13AM +0200, Quentin Garnier wrote:
> >> SMBus is a lot like I2C, and you will usually find various kind of
> >> sensors attached there.
> >
> > How?
> 
> You can probe for most of them - just issue a read and see if
> something answers. SMBus is just another protocol layer on top of iic.
> 
> > Specifically, once I have an iic at smbus, how do I find what
> > sensors are attached there?  There are a few examples in GENERIC,
> > with specific addresses for specific motherboards.
> 
> Most iic devices have hardcoded addresses but since the address space
> is pretty limited those addresses aren't unique but if you know the
> address you can at least narrow the list of candidates down a lot.
> 
> So, with iic you can's do much more than guess what's there, you're
> expected to know. SMBus devices can be discovered and identified
> though.

This is all great (and I'm building new systems right now for my laptop
and my desktop), but I still don't know what I'm likely to find.
Temperature?  Fan speed?  Computation speed in furlongs/fortnight?

		--Steve Bellovin, http://www.cs.columbia.edu/~smb