no reception, 3 bars on original firmware

Harald Welte laforge at
Fri Mar 11 11:42:24 CET 2011

Hi Calvin,

On Thu, Mar 10, 2011 at 10:11:22PM -0800, Calvin Balke wrote:
> I am having trouble getting any signal at all. the signal is around
> -111 dBm on every channel with the rf gain set on high.  The
> original firmware works fine with an at&t sim card and has 3 bars.

I think your problems may relate to the RF bands, as you seem to be
located in the US.   Most of our developers are in Europe and work
with GSM 900 + GSM 1800 bands.  Now if your phone hardware is a
GSM 850 + GSM 1900 model, and your layer23 is configured to scan
in European 900/1800 bands, you will of course never receive any signal.

This is just a guess, some people on this list have used OsmocomBB in
the US before, maybe they can comment.

The LOST message is about a lost interrupt.  There is some timer-based
code that helps us to debug problems in our layer1 code.  Loosing interrupts
means that there were TDMA frames at which we did not get or server an
interrupt, i.e. somehow the CPU / L1 was stuck and too busy to process
the next TDMA frame.

Some of those messages showing up during phone boot/start is OK, but during
normal operation they are a pretty strong indication of some bugs in our code.

- Harald Welte <laforge at> 
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

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