Re: [gpsd-dev] Has anybody tried the SiRF S4?

[Eric S. Raymond]

Hal Murray <address@hidden>:
> Has anybody updated firmware on SiRF devices? 
> (from Linux rather than Windows)

I don't know any way to do this, alas.

> How does gpsmon decide to poll for the Firmware Version?

gpsmon doesn't decisde this, it's up to the device driver and 
is normally done once shortly after driver initialization time.

> Is there any key I can use to get it to try again?
> (Are there other packet types only polled occasionally?)

The 'i' command initiates a probe for subtype.  I think
this is the only such exceptional case.

> In SiRF mode, the lower left block of gpsmon says Measured Tracker, Packet 
> Type 4.
> The two rightmost column are labeled "?" and "SF".
> What do they mean?

The ? column tells whether the corresponding satellite was used in the
last fix. SF stands for "Subframe" and occasionally reports something from 
the 50bps data, but I'm not sure what - I think someone else (probably
ckuethe) wrote that bit.
-- 
                <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>