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maemo.org - Talk (https://talk.maemo.org/index.php)
-   SailfishOS (https://talk.maemo.org/forumdisplay.php?f=52)
-   -   Porting Sailfish to N9 (https://talk.maemo.org/showthread.php?t=90761)

Flowcont 2013-10-11 08:56
Re: Porting Sailfish to N9
 
Quote:
Originally Posted by juiceme (Post 1379661)
Yeah, I have been looking at it a bit. Not really that much success since I do have a lot of other things on my mind presently :)



Well, it's fairly complicated system. The gps driver just pushes filtered satellite timing data to the driver, and the Nokia Positioning Daemon (nped) then calculates the position drom time differentials.
If you could give us some hints of the work you've done and where/how to start working on it(even create a new thread) that'd be awesome.

Thanks for your work.

juiceme 2013-10-11 10:55
Re: Porting Sailfish to N9
 
Quote:
Originally Posted by Flowcont (Post 1379945)
If you could give us some hints of the work you've done and where/how to start working on it(even create a new thread) that'd be awesome.

Thanks for your work.
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.

SourenAraya 2013-10-11 12:26
Re: Porting Sailfish to N9
 
what about CMT(cell modem) in 3.5 kernel?

mikecomputing 2013-10-11 17:51
Re: Porting Sailfish to N9
 
Quote:
Originally Posted by juiceme (Post 1379961)
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.
why cant we just access that chip direcly? or did Nokia put some firmware inside that chip that is binary crap instead of NMEA?

Btw. just found out that Nexus7 using same chip. wonder if android daemon is open source.

Not have a clue what I am talking about here but maybe doable via libhybris as a second alternative?

also found this:

https://gitorious.org/meif_protocol/...5e8ab2578808b:

juiceme 2013-10-11 18:05
Re: Porting Sailfish to N9
 
Quote:
Originally Posted by mikecomputing (Post 1380026)
why cant we just access that chip direcly? or did Nokia put some firmware inside that chip that is binary crap instead of NMEA?
You got it nailed!

Nobody makes (or uses actually) anything that gives out NMEA any longer :(

It's all about power saving and cost today. GPS chips are just the RF frontend and decoder, and the actual positional calculation is done by the main CPU. This makes kind of sense as then it is easier to use ephemerals downloaded thru net.

Most chipsets implement a variation of a proprietary binary protocol called MEIF ghich has been developed by Nokia (and N9 uses it also)

juiceme 2013-10-11 18:09
Re: Porting Sailfish to N9
 
Quote:
Originally Posted by mikecomputing (Post 1380026)
Btw. just found out that Nexus7 using same chip. wonder if android daemon is open source.

Not have a clue what I am talking about here but maybe doable via libhybris as a second alternative?
Unfortunately that part is closed. The replicant people are also looking at it though.

torcida 2013-10-22 22:27
Re: Porting Sailfish to N9
 
Quote:
Sounds like we are gonna be able to see a port for N9 soon, I presume.
http://www.jollausers.com/2013/10/sd...-won-an-award/

Any chances, what do you think? :)

anzx 2013-10-23 14:41
Re: Porting Sailfish to N9
 
will there be any theme similar to meego (eg. Icons an the swipe transtitions, the system unrestricted ui) because i think MeeGo's biggest problem is the lack of apps... What i think to have the sailfish platform and meego look...

marmistrz 2013-10-23 17:44
Re: Porting Sailfish to N9
 
Quote:
Originally Posted by anzx (Post 1381975)
will there be any theme similar to meego (eg. Icons an the swipe transtitions, the system unrestricted ui) because i think MeeGo's biggest problem is the lack of apps... What i think to have the sailfish platform and meego look...
Well, you could just add patched qt-components-qt5 in the path of Sailfish Silica. to have a similar look. But you'll need to patch 'em urself or get them patched ;)

xerxes2 2013-10-23 18:47
Re: Porting Sailfish to N9
 
Hopefully, or rather probably, there will be a working Sailfish image for the N9 the same day it's released for the Jolla. Problem will be Wayland but hopefully it'll work well enough. Not sure if it's possible to run Sailfish's UX on X11 without having the source available.


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