GPS software fix, just CRUFT?

Al Johnson openmoko at
Thu Jul 24 16:16:47 CEST 2008

On Thursday 24 July 2008, Scott wrote:
> Joerg Reisenweber wrote:
> > Am Di  22. Juli 2008 schrieb Scott Derrick:
> >> With the GPS hardware fix done(10pf cap installed) are the software
> >> changes to the kernel/modules just added cruft?  IE. do they add
> >> anything useful?
> >
> > SW is definitely better than C, it works on data-rails as well. Those
> > might spill GPS during access even while the clock is fixed by a C.
> > /jOERG
> Can somebody translate this?

The software fix is better than the capacitor because it works on all lines to 
the card, not just the clock. With just the capacitor on the clock line the 
other lines may give enough interference to upset the GPS during card access.

That's my translation anyway.

Another question - might the added capacitor on the clock line cause problems 
with the lower drive strength that's now default? 

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