hi, I'm trying to debug gps on a casio wsd-f20. test_gps gets this far, then just hangs:
```
root@koi:/home/ceres# test_gps
*** setup signal handler
*** get gps interface
*** device info
 id = gps
 name = Ayu GPS Module
 author = Casio
*** init gps interface
*** setting positioning mode
*** start gps track
*** gps tracking started
*** tracking.... 
```
stracing test_gps, these are the last few lines:
```
write(1, "*** tracking.... \n", 18*** tracking.... 
)     = 18
clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=100, tv_nsec=0}, 0xbeb98ae0) = 0
write(1, "*** tracking.... \n", 18*** tracking.... 
)     = 18
clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=100, tv_nsec=0},
```
what things should I check? I believe I'm setting all the correct permissions on the gps devices, and I can't find any services that need starting. 
looking at the vendor partition, I can see casio has some sort of gps assist service, but it's dalvik code, so I don't think it should be a critical part of the gps setup chain, but I'm not sure