So a decently working sailfish image for the n9/50 is getting closer. No need to be able to make calls and stuff. Video, audio, usb and wlan would be just fine for me. And by decently working I mean that the gui should not be insanely slooow because of software rendering.

The usual way I start such reverse engineering tasks is I try to get as much raw data as possible, and then try to make sense of it.

I compiled the driver module (bcm4751-gps.ko) with a lot of debug printouts, restarted nped, started maps and looked at the results to see what the intresting parts were.

Then I added more thorough logging to get at the data buffers passed between the kernel driver and nped.

Now next step would be to try to make sense of the data, and try to decipher the protocol specification. When that's done the positioning daemon can be replaced with a new implementation.
The source of nped is closed, but the algorithms on GPS calculation are public so the task should be doable.

Perhaps - or most likely - this is usefull
http://redmine.replicant.us/projects...t/wiki/BCM4751

zypper in sensorfw sensorfw-configs

@SourenAraya,
will try it as soon as I get home from army today =) wow, that's nice.

But the menus, etc, work?