Dear all, I vae the C115 with a T1 USB to Serial cable with the Prolific
chipset.
When i run osmocon i get :- an its just sits there with no further
processing.
./osmocon -p /dev/ttyUSB0 -m c123xor
../../target/firmware/board/compal_e88/loader.compalram.bin
read_file(../../target/firmware/board/compal_e88/loader.compalram.bin):
file_size=17120, hdr_len=4, dnload_len=17127
read_file(../../target/firmware/board/compal_e88/loader.compalram.bin):
file_size=17120, hdr_len=4, dnload_len=17127
got 1 bytes from modem, data looks like: 00 .
got 2 bytes from modem, data looks like: 2f 00 /.
got 1 bytes from modem, data looks like: 1b .
got 3 bytes from modem, data looks like: f6 02 00 ...
got 1 bytes from modem, data looks like: 41 A
got 1 bytes from modem, data looks like: 01 .
got 1 bytes from modem, data looks like: 40 @
Received PROMPT1 from phone, responding with CMD
got 1 bytes from modem, data looks like: 66 f
got 1 bytes from modem, data looks like: 74 t
got 1 bytes from modem, data looks like: 6d m
got 1 bytes from modem, data looks like: 74 t
got 1 bytes from modem, data looks like: 6f o
got 1 bytes from modem, data looks like: 6f o
got 1 bytes from modem, data looks like: 6c l
Received FTMTOOL from phone, ramloader has aborted
got 1 bytes from modem, data looks like: 65 e
got 1 bytes from modem, data looks like: 72 r
got 1 bytes from modem, data looks like: 72 r
got 1 bytes from modem, data looks like: 6f o
got 1 bytes from modem, data looks like: 72 r
got 1 bytes from modem, data looks like: 00 .
got 1 bytes from modem, data looks like: 00 .
I think the cable is ok as when i run my fingers on the tip i get random
Zeros so it appears to be talking to the cable.
Also when i tried to run Mobile i get the :- even though i created the
Mobile.cfg file in /etc/osmoco
Failed to parse the config file: '/home/raz/.osmocom/bb/mobile.cfg'
Please check or create config file using: 'touch
/home/raz/.osmocom/bb/mobile.cfg'
I have spent some hours researching the lists and trying various things to
no avail but I want to continue until I resolve this issues and use this
great stack to learn about the GSM network.
Please advise.
Great full for any help or pointers but this maybe a timing issue that is
difficult to debug.
Thanks
Raz
hi,
i did a lot of resarch and testing on cell selection and re-selection
process the last two week.
the cell selection process, network selection process (manual and
automatic) and mobility management process were already implemented in
OsmocomBB a long time, but turned out to be buggy and incomplete. i made
test drives to check the process and debugged it.
the re-selection process is new. it is used to track surrounding cells
while listening to the BCCH of the current cell (camping on a cell).
special extension to the layer1 firmare is used to measure neighbour
cells. if an neighbour cell becomes 'better', the mobile switches to
that cell, depening on different criteria. now it is possible to move
with OsmocomBB.
the re-selection process is not handover! handover is a process where a
phone switches between cells while doing a call. handover is one next
step to implement. the process is a little more complex, because it
requires not only neighbour cell measurements, but also syncing to them
without interrupting the traffic channel. most layer 3 stuff of handover
is already implemented.
if you like to play and test your moving OsmocomBB, you can check out
the "jolly/roaming" branch. it contains the extension to layer1, as well
as sim reader and fixes from "sylvain/testing" branch. use both "mobile"
and "layer1" firmware from this branch.
in order to see some process at VTY, you can do:
enable
monitor network 1 (continously display the strongest cell and neighbour
cells)
show ms 1 (to see current states)
show neighbour-cells 1 (to see a more detailed current list of
neighbours)
andreas
hi josephli,
> Read stored BA list mnc=01
the mobile application stores the last cells and neighbour cells (band
allocation) of each network. this way the scanning is much
faster when restarting. because you use the SIM card with MNC == 02 the
first time, there is no band allocation stored for that. the mobile will
do a full scan in this case.
> while the sim card service I am tesing is actually with mnc 00 and 02.
i know that MNC == 0 will not work until i commited improvements of cell
selection process last sunday. you should retry that, but first try with
an MNC > 0.
can you provide debug output when trying a call?
also can you provide VTY output of "show ms" before you make the call?
regards,
andreas
hi,
i just fixed some locking issues the last days. fix will follow. it took
a bit longer, because there were some race conditions. it took up to
about one hour until it crashed. my way to detect the area where the
crash happened, was to turn on buzzer before that area, and turn it off
after that area. after many hours of approximation, i finally found out
that the major crash happend during _talloc_zero. (first it looks for a
free memory chunk, then it allocates it.) since it can be called from
all contexts (main, irq, fiq), it need to be locked against any
interrupt, otherwise the memory chunk can be assigned multiple times.
(the process of _talloc_free is "atomic" and requires no locking.)
because it seems pretty stable, i think it is time to merge some
branches into the master. (i made a 6 hours call yesterday. and no crash
after bugfix ever since.) i will do that together with sylvain, if we
find the time this weekend.
currently i use the jolly/voice together with the sylvain/traffic
branch. i am able to use an isdn phone togehter with linux-call-router
and make/receive calls. audio is passed both ways. i think this is a
stage where it actually become "usable". (if not moving arround.)
one of my major work for the next weeks/months will be the neighbour
cell measurement, cell re-selection, and handover. this is essential
when moving with the phone.
regards,
andreas
Hi,
I've hacked something together to quickly test non-combined CCCH.
However, I've hit a problem when trying to receive anything on another
timeslot than 0.
The TX side seems to work fine as the BTS can see my location update
request and answers with a reject, but on the MS side, I never see the
reject and wireshark only shows invalid incohrent data on the RX.
The frames for SDCCH/8 show really nothing valid (looks like random
bytes), things like
09 80 7f 47 49 06 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
09 00 47 d5 2d 06 1e 00 00 69 7c a0 91 3d 22 ff ab fe 6c 4f 56 4f 36
...
while the frames for the associated SAACH show at least something gsm-like :
03 03 01 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
but that's not quite a SI5/6 ...
To RX/TX on TS=1, I just delayed the RX/TX window by 625 bits (4 *
156.25) when I'm in dedicated channel mode by chaning the 'start' in
l1s_tx_win_ctrl / l1s_rx_win_ctrl
Is there something else that should be done ?
Cheers,
Sylvain
Hi Sylvain, hi list!
I'm experimenting with burst_ind and TCHs right now and ran
into some problem I couldn't solve yet.
After receiving an Assignment Command for a hopping TCH/F I
call l1ctl_tx_dm_est_req_h1() with all necessary parameters
and tch_mode GSM48_CMODE_SPEECH_V1 or _EFR.
After that I do get burst indications containing the received
bits on up- and downlink for the active arfcn on each
consecutive frame number.
BUT the rx level measurements are most of the time very low
and sporadic higher, surely not from that nearby bts and the
very close cellphone.
It looks like the layer1 doesn't "hit" the right timeslot
on the right arfcn at the right time.
There are some possible sources of error leading to that, like
hopping parameters, channel number and MA list.
But I checked these and I took all of them directly from the
ASS CMD, the MA as word list in ascending order, like in layer23
IMM ASS handling.
The specific AC doesn't have any specialties like Starting Time
or "before time" parameters.
So my question is if there is some obvious pitfall I'm missing
and are there any suggestions how to debug that?
Regards,
Mad
Hi,
I am trying to use burst_ind branch of osmocom. I have noticed that layer23 creates bursts****.dat files when it indicates uplink. What data are written to these files and what should I use to see its data? Thank you.
Hi!
Recently we've had the idea of using OsmocomBB with a simple firmware
that synchronizes to an existing GSM networks FCCH and use the resulting
13MHz clock to drive the USRP for airprobe or OpenBTS.
Ideally, we would even use the Calypso-internal PLL (for ARM or DSP) to
multiply it up to the required 52 MHz. However, neither the Openmoko
nor the Compal/Motorola phones expose any of the 3 clock output pads :(
So the only choice is to use something along the lines of the
http://focus.ti.com/docs/prod/folders/print/cdcvf25084.html
as a quad clock multiplier and attach it to the CLK13OUT signal of the
phone.
The chip is available for 9 USD in single quantities at digikey, and
possibly cheaper at other sources. Combined with a sub-20EUR phone it
might be a very cheap but still accurate frequency source for OpenBTS -
at least as long as there are any commercial gsm networks available.
Regards,
Harald
--
- 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)
Hi All!
That's true, I managed to run U-Boot on MT6235, but linux kernel is
not fully functional yet (it's fresh stuff as I managed to ran it on
Tuesday and then I was off to conference).
For MT6235 development I chose Sciphone G2, which is pretty cheap.
After some time I managed to download code to SRAM (just 64KB) using
MTK's FlashTool.
MTK FlashTool communicates over UART directly with MT6235 bootloader
and sends its own chunk of code (about 58KB) which is executed in SRAM
and communicates with FlashTool.
I found on pudn.com some pack to customize code loaded by FlashTool,
thanks to which I could download my own code to SRAM (without JTAG).
The problem was that it had to be linked with some security libraries
which occupied about 56KB and not much memory left for my own code.
Then I decided to try find JTAG pins to get all control on MT6235.
That took me sometime, but finally I succeeded.
The other bigger issue was initializing DRAM controller to be able to
download bigger code (linux kernel + uboot) to external RAM. In
sciphone there is problem that all interesting chips are under metal
shield which is pretty havily soldered. In this case I couldn't read
what kind of RAM memory is mounted without destroying the board (I
don't have such soldering machine which could unsolder so big metal
shield). Thanks to JTAG I could attach to target and then dump DRAM
controller registers from processor running MTK's software, but
setting these values after processor start and configuration of PLL
didn't work.
I decided to disassemble bootloader which could show me how DRAM
controller is initialized and how code fron NAND is loaded (to be able
to flash U-Boot and kernel to NAND so MT6235 will start my code
automatically and I will not have to use JTAG). Currently I have
knowledge how internal MT6235 bootloader is loading code from memory
during startup and I also extracted procedure of DRAM controller
initialization. Thanks to that I'm able to run U-Boot from the very
begining of processor startup.
The problem is that I have just one piece of Sciphone G2 and I don't
want to flash it yet to not break existing code in it. Thanks to
running device I'm able to attach with JTAG and check how peripherals
are configured (i.e. LCD, MMC, etc.). I have backup of flash, but I'm
not 100% sure if I will flash it back, phone will startup. That's why
I bought second piece of Sciphone G2 and should receive it today or on
Tuesday (this Monday is holiday in Poland). In this case I'll flash
U-Boot to NAND and try to make it working. Then we could load the rest
of code from U-Boot (to RAM or NAND over serial).
You can see how my setup looks on attached picture.
The good thing about it is that the same bootloader is used in MT622x,
so it should be fairly easy to do the same on phones based on that
SoCs (but unfortuantely it's just ARM7).
If it comes to code, of course I can share it on "git.osmocom.org".
Currently it's just basic port of U-Boot and not much for linux
kernel, but I'm working on this now so I'll push it when it'll be
ready.
Currently I'm working on driver for NAND memory for U-Boot, so we
could flash linux kernel. When that will be ready I'll push the code.
Then I'll switch to linux kernel and when it'll be functional I also
push the code. At this stage you will not need to have JTAG and you
could load the code over serial in U-Boot.
If it comes to GSM I didn't work with it before. I actualy worked 6
months in L2/3 team for LTE (on RRC) but it's different story.
That could be really outstanding thing if we could run first phone
ever with whole code open (from BB up to APP).
BR,
Marcin
