FreeCalypso > hg > freecalypso-tools

annotate rvinterf/doc/README.older @ 1011:6d9b10633f10

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etmsync Pirelli IMEI retrieval: fix poor use of printf() Bug reported by Vadim Yanitskiy <fixeria@osmocom.org>: the construct where a static-allocated string was passed to printf() without any format arguments causes newer compilers to report a security problem. Given that formatted output is not needed here, just fixed string output, change printf() to fputs(), and direct the error message to stderr while at it.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 23 May 2024 17:29:57 +0000
parents e7502631a0f9
children
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Mychaela Falconia <falcon@freecalypso.org>
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1 I (Spacefalcon the Outlaw, FreeCalypso developer) am still learning what kinds
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Mychaela Falconia <falcon@freecalypso.org>
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2 of traffic may be passed across TI's RVTMUX binary-packet serial interface. We
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Mychaela Falconia <falcon@freecalypso.org>
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3 already know that much of this traffic is debug trace output, i.e.,
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Mychaela Falconia <falcon@freecalypso.org>
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4 unidirectional and essentially unconditional output from the GSM device. All
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Mychaela Falconia <falcon@freecalypso.org>
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5 of the "standard" firmwares we have (mokoN, our leo2moko which functions almost
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Mychaela Falconia <falcon@freecalypso.org>
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6 identically, and Pirelli's fw) produce massive volumes of such trace output in
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Mychaela Falconia <falcon@freecalypso.org>
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7 normal operation. We already know that this "unsolicited" trace output comes
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Mychaela Falconia <falcon@freecalypso.org>
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8 in at least 3 different flavors:
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Mychaela Falconia <falcon@freecalypso.org>
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9
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Mychaela Falconia <falcon@freecalypso.org>
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10 * RiViera traces emitted by rvf_send_trace()
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Mychaela Falconia <falcon@freecalypso.org>
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11 * L1 traces
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Mychaela Falconia <falcon@freecalypso.org>
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12 * G23 traces
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Mychaela Falconia <falcon@freecalypso.org>
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13
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Mychaela Falconia <falcon@freecalypso.org>
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14 The RVTMUX interface can be used for more than just trace output, though: any
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Mychaela Falconia <falcon@freecalypso.org>
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15 component in TI's fw suite can send and/or register to receive binary packets.
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Mychaela Falconia <falcon@freecalypso.org>
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16 As I slowly work my way through various components which comprise TI's Leonardo
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Mychaela Falconia <falcon@freecalypso.org>
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17 fw whose semi-source we use as our reference version, learning what they do and
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Mychaela Falconia <falcon@freecalypso.org>
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18 reintegrating them in our own gsm-fw, I will undoubtedly uncover additional uses
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Mychaela Falconia <falcon@freecalypso.org>
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19 to which the RVTMUX interface is put.
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Mychaela Falconia <falcon@freecalypso.org>
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20
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Mychaela Falconia <falcon@freecalypso.org>
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21 Aside from the trivial provision in the RVT module itself whereby an external
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Mychaela Falconia <falcon@freecalypso.org>
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22 host can send a command to the target to set a filter masking some of the RV
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Mychaela Falconia <falcon@freecalypso.org>
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23 trace output, so far the only entity I've come across which accepts packets from
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Mychaela Falconia <falcon@freecalypso.org>
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24 an external host is ETM (Enhanced Test Mode). ETM implements a registration
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Mychaela Falconia <falcon@freecalypso.org>
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25 system of its own, whereby other modules can register with ETM to receive
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Mychaela Falconia <falcon@freecalypso.org>
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26 certain external command messages passing first through RVT, then through ETM.
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Mychaela Falconia <falcon@freecalypso.org>
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27
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Mychaela Falconia <falcon@freecalypso.org>
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28 Because I do not yet have a clear mental picture of *every* function for which
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Mychaela Falconia <falcon@freecalypso.org>
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29 the RVTMUX interface will ever be used, it is correspondingly impractical to
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Mychaela Falconia <falcon@freecalypso.org>
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30 decide on a once-and-for-all design of what the host-side software for talking
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Mychaela Falconia <falcon@freecalypso.org>
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31 to this interface should be like. Therefore, it is currently premature to
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Mychaela Falconia <falcon@freecalypso.org>
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32 expect any stability in the present rvinterf subdirectory of freecalypso-sw; I
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Mychaela Falconia <falcon@freecalypso.org>
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33 may implement something one day, then toss it away the next day (without
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Mychaela Falconia <falcon@freecalypso.org>
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34 providing much in the way of backward compatibility) when I come up with some
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Mychaela Falconia <falcon@freecalypso.org>
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35 other idea.
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Mychaela Falconia <falcon@freecalypso.org>
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36
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Mychaela Falconia <falcon@freecalypso.org>
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37 The current roadmap for what the rvinterf suite of host tools is envisioned to
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Mychaela Falconia <falcon@freecalypso.org>
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38 look like eventually is as follows:
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Mychaela Falconia <falcon@freecalypso.org>
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39
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Mychaela Falconia <falcon@freecalypso.org>
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40 rvtdump Opens the serial port, decodes TI's binary packet protocol, and
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Mychaela Falconia <falcon@freecalypso.org>
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41 simply dumps every received/decoded packet on stdout in a human-
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Mychaela Falconia <falcon@freecalypso.org>
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42 readable form. No provision for sending anything to the target.
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Mychaela Falconia <falcon@freecalypso.org>
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43 Intended use: observing the debug trace output which all TI
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Mychaela Falconia <falcon@freecalypso.org>
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44 firmwares emit as standard "background noise". This utility has
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Mychaela Falconia <falcon@freecalypso.org>
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45 already been written, and it allows one to observe/log/study the
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Mychaela Falconia <falcon@freecalypso.org>
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46 "noise" that appears on Pirelli's USB-serial port (running
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Mychaela Falconia <falcon@freecalypso.org>
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47 Pirelli's original fw), as well as that emitted on the IrDA
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Mychaela Falconia <falcon@freecalypso.org>
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48 (headset jack) port on the GTA02 by mokoN/leo2moko firmwares.
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Mychaela Falconia <falcon@freecalypso.org>
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49
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Mychaela Falconia <falcon@freecalypso.org>
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50 rvinterf My plan is to make a copy of rvtdump, called rvinterf, and have
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Mychaela Falconia <falcon@freecalypso.org>
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51 it act very much like rvtdump: receive TI's packets from the
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Mychaela Falconia <falcon@freecalypso.org>
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52 serial port, decode them and print the decoded form on stdout.
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Mychaela Falconia <falcon@freecalypso.org>
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53 However, rvinterf will also create a listening UNIX domain
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Mychaela Falconia <falcon@freecalypso.org>
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54 socket to which other programs in the present suite will
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Mychaela Falconia <falcon@freecalypso.org>
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55 connect. These other programs connecting through rvinterf will
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Mychaela Falconia <falcon@freecalypso.org>
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56 be able to send packets to the target, as well as register to
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Mychaela Falconia <falcon@freecalypso.org>
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57 receive certain kinds of target->host message packets.
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Mychaela Falconia <falcon@freecalypso.org>
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58
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Mychaela Falconia <falcon@freecalypso.org>
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59 fc-tmsh FreeCalypso Test Mode Shell is my vision for the utility which
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Mychaela Falconia <falcon@freecalypso.org>
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60 will provide a practically usable interface to ETM. ETM's
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Mychaela Falconia <falcon@freecalypso.org>
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61 general mode of operation seems to be (weasel phrase inserted
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Mychaela Falconia <falcon@freecalypso.org>
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62 because many other fw components may connect through ETM, and I
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Mychaela Falconia <falcon@freecalypso.org>
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63 have yet to study all of them) command-response: an external
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Mychaela Falconia <falcon@freecalypso.org>
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64 host sends a command to ETM, that command gets dispatched to the
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Mychaela Falconia <falcon@freecalypso.org>
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65 proper registered handler, the command function is executed, a
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Mychaela Falconia <falcon@freecalypso.org>
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66 response packet is composed, and finally that response is sent
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Mychaela Falconia <falcon@freecalypso.org>
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67 back to the host. But because all code on the target side is
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Mychaela Falconia <falcon@freecalypso.org>
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68 under active development and debugging, we should not expect
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Mychaela Falconia <falcon@freecalypso.org>
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69 perfect lock-step behaviour on the interface; instead, our
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Mychaela Falconia <falcon@freecalypso.org>
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70 fc-tmsh should be fundamentally asynchronous: when the user
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Mychaela Falconia <falcon@freecalypso.org>
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71 enters a command, the appropriate command packet is sent to the
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Mychaela Falconia <falcon@freecalypso.org>
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72 target, but we are prepared for target->host messages at any
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Mychaela Falconia <falcon@freecalypso.org>
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73 time, without enforcing strict correspondence to issued
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Mychaela Falconia <falcon@freecalypso.org>
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74 commands: let the developer-operator sort that out instead.
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Mychaela Falconia <falcon@freecalypso.org>
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75
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Mychaela Falconia <falcon@freecalypso.org>
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76 The usage scenario I envision is that one will need to run rvinterf first
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Mychaela Falconia <falcon@freecalypso.org>
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77 (either directly or through fc-xram) in one terminal window, leave it running,
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Mychaela Falconia <falcon@freecalypso.org>
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78 then run fc-tmsh in another terminal window, and have it connect to rvinterf
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Mychaela Falconia <falcon@freecalypso.org>
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79 via the local UNIX domain socket interface. Why such complexity, why not have
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Mychaela Falconia <falcon@freecalypso.org>
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80 one program do everything? I suspect that in many debug/experimentation
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Mychaela Falconia <falcon@freecalypso.org>
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81 sessions it will be necessary to use fc-tmsh on "noisy" targets, i.e., in
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Mychaela Falconia <falcon@freecalypso.org>
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82 scenarios where the target is continuously spewing its "normal" voluminous debug
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Mychaela Falconia <falcon@freecalypso.org>
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83 trace output, such that the "interesting" output as in responses to commands
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Mychaela Falconia <falcon@freecalypso.org>
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84 gets drowned in the noise. In such a scenario it would be helpful to have one
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Mychaela Falconia <falcon@freecalypso.org>
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85 terminal window in which one sees the transcript of the fc-tmsh session,
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Mychaela Falconia <falcon@freecalypso.org>
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86 consisting of issued commands and received ETM responses without the general
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Mychaela Falconia <falcon@freecalypso.org>
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87 noise, and another window in which one sees all RVTMUX interface activity in
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Mychaela Falconia <falcon@freecalypso.org>
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88 real time - the latter would allow one to observe commands having side effects
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Mychaela Falconia <falcon@freecalypso.org>
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89 outside of ETM, such as crashing the whole fw. :-)