baseband-devel

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2023 discussions

Layer2 Wireshark integration
by Harald Welte 19 Feb '10

19 Feb '10

Hi! I've recycled the old GSMTAP wireshark plugin that I originally wrote for project airprobe. Using this patch (now in our git tree as well, applies against current wireshark svn) and the layer2 host program as well as the l1test.bin target program, you can watch BCCH messages in realtime. The architecture is like this: * DSP forwards decoded normal burst data to layer1/sync.c * layer1/sync.c generates L1A_L23 protocol message and sends it via the SERCOMM HDLC layer over RS232 * "osmocon" receives the HDLC frame and relays it to the Unix domain socket * "layer2" receives the L1A_L23 protocol message on the Unix domain socket, adds a GSMTAP header and sends it to the GSMTAP UDP port on localhost * wireshark captures on the 'lo' interface and calls the GSMTAP dissector plugin for everything received on the GSMTAP UDP port number. Have fun! -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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good work!
by Christopher Friedt 19 Feb '10

19 Feb '10

Congratulations to all of the developers that worked on this project - you must be very proud at this point! At some point, when I have some free time, I hope to contribute to the codebase (although I don't have a motorola c123, I'm hacking on some other handhelds currently). C

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Announcing project OsmocomBB: Open Source GSM Stack
by Harald Welte 19 Feb '10

19 Feb '10

Good news, everyone [tm]! I am hereby publicly announcing project OsmocomBB: A Free and Open Source software project to create a Free Software GSM baseband firmware. The baseband chipset is the part of a mobile phone that actuall communicates directly with the GSM network. It typically includes a DSP and a microprocessor running some RTOS, drivers for the baseband chipset, the GSM protocol stack and some kind of user interface. GSM has been deployed first 19 years ago. Despite billions of phones deployed world wide, all of them run a proprietary baseband firmware, consisting of proprietary drivers, RTOS and GSM protocol stack. OsmocomBB has set out to change this. We do not want our phones to be a black box connected 24/7 to a public network. We want to decide what kind of data our phone reveals about us or not. The authors behind the project have already spent the last 15 months implementing an Open Source GSM network side protocol implementation called OpenBSC. In January 2010, they decided to go after the phone side protocol stack - which turned into OsmocomBB. => What is the project status? Right now we are at a state where we have full control over the baseband hardware, including the DSP and ARM cores, the analog baseband chip, the RF transceiver, keypad, LCD display and other components. We can scan the GSM band for cells, perform FCCH detection, run automatic gain control to synchronize to the cells carrier, detect the SCH to get BSIC and GSM frame number, as well as dump the BCCH and CCCH of the cell. => What does Osmocom mean? Open Source MObile COMmunications. It is meant as an umbrella name for various FOSS projects related to communications, including OsmocomBB but also including sister projects like OpenBSC. => Can I make phone calls yet? No. We are currently in Rx (receive) only mode, and have no Layer2 or Layer3 implementation yet. However, the difficult parts of driving the GMS hardware and implementing a minimal Layer1 are behind us, so we are confident to proceed to actual phone calls during the months to come. => Where can I get the source? The git repository is at git://git.osmocom.org/osmocom-bb.git The mailing lists are at http://lists.osmocom.org/ The project homepage including wiki is at http://bb.osmocom.org/ => What phones are supported? We are implementing OsmocomBB as hardware-independent as possible. At the moment, we only have drivers for the Ti Calypso Digital Baseband chip. Our main target are the following Motorola-branded phones (made by Compal): C115/116/117/118/119/120/121/122/123/139/140/155 Adding support for other Calypso-based phones should be relatively easy, but porting it to a different baseband chip is a lot of work, especially without access to good documentation. => How can you help? We need developers who have experience in microcontroller development working on an ARM7TDMI core. You do not need to know anything about GSM in order to help us with tasks such as the UI, driving the battery charging controller, etc. If you want to join, get yourself a phone, serial cable, join the developer mailing list and introduce yourself! Happy Hacking Harald Welte -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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