OsmocomBB Firmware » History » Version 2
= Background =
The OsmocomBB source code comes with several applications for various purposes.
Those applications can be devided into two separate classes, applications: * running on the baseband chip of the phone * running on a PC, communicating with the baseband firmware over serial
Applications running on the PC can further be partitioned into: * Firmware management software (loading, flashing, ...) * GSM Layer 3 applications
The following will provide you a rough overview of the most commonly used software pieces.
= Baseband firmware =
Binary location: src/target/firmware/board/*/*.bin
Source locations: src/target/firmware/, particularly apps and layer1
A simple GSM layer 1 proxy, communicating over the [wiki:L1A_L23_Interface].
This allows you to run a full-blown GSM implementation on your host machine, communicating through the phones radio interface.l1test
Layer 1 development application.
This application does what layer1 does, but automatically tunes to the strongest ARFCN it can find.
It can be used for stand-alone-testing of the phones radio.loader
Our [wiki:Bootloader], available in various build configurations.compal_dsp_dump
Application for dumping the contents of the DSP in the Calypso chip.compal_dumper
The old compal device dumper. Use [wiki:Bootloader] instead once it is available.hello_world
The initial obligatory "Hello, world!" application.
Currently, this does more than say hello. Intended as a template for new applications.rssi
The [blog:rssi-firmware] can be used to monitor the received signal indication (RSSI) of ARFCNs or the entire spectrum.
= Firmware management software =
Location (source and binary): src/host/osmocon
[wiki:osmocon] is a console tool for interfacing our baseband firmware on the phone with applications on the host PC.
It is responsible for downloading a baseband firmware or bootloader into the phone and relay communication between Layer 3 applications and baseband firmwares over serial. osmoload
[wiki:osmoload] is used to write, dump and examine flash memory of supported phones
You will need this program for example if you intent [wiki:flashing] an application to the phone (the software is usually loaded into RAM).
= GSM Layer 3 applications =
Location (source and binary): src/host/layer23/*
Layer 3 applications implement various functionality based on GSM Layer 3.mobile
[wiki:mobile] is the most sophisticated OsmocomBB application so far.
It implements most of the behavior of a regular GSM telephone, but is extended in many ways with features interesting to researchers. cell_log
The cell_log application scans through valid available carrier frequencies, attempts to sync to them and dumps information gathered from the BCCH.
It is usually used to create a list of used ARFCNs and information such as their reception levels, MNC, MCC, and System Information. ccch_scan
The ccch_scan application can sync to a carrier ARFCN and logs power measurement and CCCH information (paging requests and Immediate Assignments). bcch_scan
bcch_scan is basically a predecessor of cell_log and logs information as observed on the BCCH (System Information). cbch_sniff
cbch_sniff dumps cell broadcast channel information such as, e.g., GPS location of the cell.