baseband-devel December 2012

baseband-devel@lists.osmocom.org

27 participants
51 discussions

Can't compile after last pull
by Dario Lombardo 20 Dec '12

20 Dec '12

I've pulled git repo today, but the RSSI firmware gets an error. apps/rssi/main.c: In function `main': apps/rssi/main.c:896: warning: 'a' might be used uninitialized in this function apps/rssi/main.c:896: warning: 'e' might be used uninitialized in this function CC board/compal_e88/rssi.compalram.manifest.o LD board/compal_e88/rssi.compalram.elf OBJ board/compal_e88/rssi.compalram.bin CC board/compal_e88/rssi.highram.manifest.o LD board/compal_e88/rssi.highram.elf OBJ board/compal_e88/rssi.highram.bin CC board/compal_e88/rssi.e88loader.manifest.o LD board/compal_e88/rssi.e88loader.elf OBJ board/compal_e88/rssi.e88loader.bin CC board/compal_e88/rssi.e88flash.manifest.o LD board/compal_e88/rssi.e88flash.elf OBJ board/compal_e88/rssi.e88flash.bin CC board/compal_e86/rssi.compalram.manifest.o LD board/compal_e86/rssi.compalram.elf arm-elf-ld: region LRAM is full (board/compal_e86/rssi.compalram.elf section .data) make[1]: *** [board/compal_e86/rssi.compalram.elf] Error 1 make[1]: Leaving directory src/target/firmware' make: *** [firmware] Error 2 $ git pull Already up-to-date. $ Anyone experiencing the same issue?

9 11

graphical gsmtap helper
by ☎ 19 Dec '12

19 Dec '12

Hello. It's often handy to have a high-level look at message exchange between ms and gsm network captured via gsmtap. There are some tools to do that for ip captures but they completely ignore uplink-downlink semantics so are next to useless in this case. Attached is little helper which can be used to make proper descriptions for mscgen to produce nice message sequence charts. Usage instructions are inside the script. In short: .pcap in - .png out It requires mscgen and recent (>=1.9) tshark so you have to use git to get and build tshark binary yourself until wireshark 1.10 is released: git clone http://code.wireshark.org/git/wireshark Apologies if you received this message multiple times but I personally find this little helper to be very useful so I'd like to reach as wide audience as possible. -- best regards, Max, http://fairwaves.ru

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restart layer1 from remote?
by Tim Ehlers 18 Dec '12

18 Dec '12

Hi, I have the problem, that after running for quite a while, lets say a week, the layer1 seems to crash. This crash is random and only happens on single phones (I have 6 phones connected to one mobile app). This phone is unusable, even after "shutdown/no shutdown" or complete restart of mobile, this phone stays like this: OsmocomBB# show ms 3 MS '3' is up, service is limited IMEI: XXXXXXXXXXXX IMEISV: XXXXXXXXXXXXX IMEI generation: fixed automatic network selection state: A1 trying RPLMN MCC=262 MNC=07 (Germany, O2) cell selection state: C1 normal cell selection radio ressource layer state: idle mobility management layer state: MM idle, PLMN search By restarting the phone (pressing power on the phone, and reloading layer1) its working again. But this need physical access to the phone. Is there a way to somehow "reboot" or restart the layer1 by software? And if not, could that easily be implemented? Thanks Tim

2 3

System information type 5 & 6
by g.roelant＠telenet.be 16 Dec '12

16 Dec '12

Hi, i'm capturing my own voice calls in wireshark. i can see a system information type packet just before ciphering command. 204 frames further there is a system information type 6 packet. but these 2 packets don't resamble... how can i subtract a key out of these 2 different packets? this doesn't make any sens.... if i look for the same type 5 packet... they are never at the same location.... :( is my reasoning wrong? kind regards

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question about l1ctl_burst_ind structure
by g.roelant＠telenet.be 15 Dec '12

15 Dec '12

Hi, In the L1ctl_burst_ind structure is: uint8_t bits[15]; /* 114 bits + 2 steal bits. Filled MSB first */ if i do 8 * 15 = 120 that would make 6 bits extra... not 2 bits should i discard the last 6 bits of the last byte? thanks

2 1

burst_ind branch
by g.roelant＠telenet.be 15 Dec '12

15 Dec '12

Please correct me if i'm wrong: i'm writing a small c program to process to burst files. run ccch_scan and follow the frames in wireshark. if you see an "inrtresting" frame, note his number get the correct frame out of the burst file and display its bit stream. than this bitstream can be further used for processing add a certain offset to the framecounter and get that frame out of the burst file and display its bit stream. the rest.... i still have to figure that out... can anyone confirm i am doing the write thing? thanks

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Questions about filter replacement and fbsb_req
by Pe 14 Dec '12

14 Dec '12

Hi list! I'm playing with ccch_scan from burst_ind branch. I have some troubles with going SDCCH - FCCH\SCH - TCH After receiving "assignment command" i call fbsb_req to L1 for waiting FCCH\SCH sync bursts. When fbsb_resp is coming, i call dm_est_req_h1 with channel and hopping params. But SNR of incoming tch bursts is less then 10 most of time. What did i wrong? Is it needs to synchronize only timers by SCH without FCCH freq sync? And why we lose sync when goes from SDCCH to TCH? And a question about filter replacement. After filter change on baluns i see -128 dBm on all ARFCNs when mobile app from master branch is started. After that i tried to connect balanced line to the former filter pad and unbalanced line to the ground via cap(on the EGSM channel), as Sylvain wrote. But it didnt help. Photo after filter rework on C115: http://s9.postimage.org/r50qtx73z/lastrep.jpg As i understand, the input tract with 2 caps, 2 inductors and band-pass filter just needs for image frequency disabling? -- View this message in context: http://baseband-devel.722152.n3.nabble.com/Questions-about-filter-replaceme… Sent from the baseband-devel mailing list archive at Nabble.com.

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Re: imm ass packages
by g.roelant＠telenet.be 14 Dec '12

14 Dec '12

sorry, i made a type in wireshark i see 31 06 3f in documentation is see 2d 06 3f now you tell me that only the 3f is responsible for detecting a imm ass packet. if i wanted to detect (grep) for imm ass., shall i look for 31 06 3f or 2d 06 3f? ----- Oorspronkelijk e-mail ----- Van: "oxccoxcc oxccoxcc" <oxccoxcc(a)yandex.ru> Aan: "g roelant" <g.roelant(a)telenet.be>, "osmocomBB" <baseband-devel(a)lists.osmocom.org> Verzonden: Vrijdag 14 december 2012 16:03:34 Onderwerp: Re: imm ass packages wireshark processing of imm ass packets seems normally. Looks like a bug with partial release complete messages. But wireshark has a signature for it: http://anonsvn.wireshark.org/wireshark/trunk/epan/dissectors/packet-gsm_a_r… Try to write in the wireshark forum. 14.12.2012, 14:22, "g.roelant(a)telenet.be" <g.roelant(a)telenet.be>: > In wireshark i see immediate assignment packages... > they are like 31 06 0f > but in the documentation they are like 2d 06 3f > what am i doing wrong? > i'm listening to a belgium operator called proximus. > kind regards

2 1

stupid question
by g.roelant＠telenet.be 14 Dec '12

14 Dec '12

Are the bursts captured with ccch_scan in burst_ind branch the same as the bursts captured with usrp2? do they result in the same file? i guess not... kind regards

2 1

imm ass packages
by g.roelant＠telenet.be 14 Dec '12

14 Dec '12

In wireshark i see immediate assignment packages... they are like 31 06 0f but in the documentation they are like 2d 06 3f what am i doing wrong? i'm listening to a belgium operator called proximus. kind regards

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baseband-devel December 2012