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doc/Flash-write-protection: new article
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 04 Dec 2023 01:42:35 +0000
parents e7502631a0f9
children
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Mychaela Falconia <falcon@freecalypso.org>
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1 You are looking at the suite of FreeCalypso tools for talking to the RVTMUX
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Mychaela Falconia <falcon@freecalypso.org>
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2 interface provided by TI-based GSM firmwares. If you haven't already, please
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3 read ../doc/RVTMUX first.
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4
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5 The fundamental difference between these tools and loadtools is that loadtools
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6 operate on a GSM device while its regular firmware is shut down, whereas the
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7 present rvinterf tools talk to active running GSM firmwares.
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8
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9 The following tools are currently implemented:
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10
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11 rvtdump Opens the serial port, decodes TI's binary packet protocol, and
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12 simply dumps every received/decoded packet on stdout in a human-
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13 readable form. No provision for sending anything to the target.
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14 Intended use: observing the debug trace output which all TI
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15 firmwares emit as standard "background noise". This utility
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16 allows one to observe/log/study the "noise" that appears on
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17 Pirelli's USB-serial port (running Pirelli's original fw),
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18 as well as that emitted on the IrDA (headset jack) port on the
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19 GTA02 by mokoN/leo2moko firmwares.
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20
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21 rvinterf Provides a bidirectional interface to RVTMUX on the host side.
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22 It dumps and/or logs the "background noise" emitted by the
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23 target just like rvtdump, but also creates a local UNIX domain
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24 socket on the host machine to which other programs can connect,
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25 replicating the MUXing function on the host side.
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26
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27 fc-tmsh Interactive asynchronous test mode shell. This program connects
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28 to a target GSM device through rvinterf and allows a developer-
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29 operator to send various ETM commands to the target. ETM
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30 responses are decoded (sometimes only lightly) and displayed.
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31 fc-tmsh is fully asynchronous in that it continuously listens
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32 (via select(2)) both for user input and for packets from the
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33 target at the same time, translating any user-entered commands
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34 into packets to the target and conversely, scribbling on the
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35 terminal when a packet arrives from the target. It has no
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36 knowledge of any correspondence between commands and responses
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37 they normally elicit.
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38
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39 g23sh Like fc-tmsh (same asynchronous design), but for GPF/G23 rather
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40 than ETM. This tool and FreeCalypso project's understanding of
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Mychaela Falconia <falcon@freecalypso.org>
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41 GPF/G23 in general are currently in the earliest stages, so it
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42 is premature to try to describe it any further at this point.
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43
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44 fc-sendsp Precursor to g23sh; even less worthy of further documentation.
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45
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46 fc-fsio This program uses RVTMUX, ETM and TMFFS2 to access the live file
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47 system of a running GSM firmware. Of the existing proprietary
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48 firmwares, the only one that implements the TMFFS2 protocol
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49 required for fc-fsio is Pirelli's, to the best of our knowledge.
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50 This program connects to the target through rvinterf, but it
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51 differs from fc-tmsh in that it operates in a synchronous
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52 manner: the flow of operation is driven by user commands (just
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53 like in fc-loadtool), and every time the program sends an ETM
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54 command packet to the target, it expects a lock-step response.
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55
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56 tfc139 See ../doc/Compal-unlock
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57
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58 The fc-fsio, fc-tmsh and g23sh tools connect to the target not directly, but
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59 via rvinterf. Two usage scenarios are supported:
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60
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61 1. The user explicitly runs rvinterf (either directly or secondary to fc-xram,
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62 when testing an experimental FreeCalypso firmware ramImage), leaves it
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63 running (either backgrounded or in its own terminal window), and then runs
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64 one of the "client" programs: fc-fsio, fc-tmsh or g23sh. The two programs
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65 connect via local UNIX domain sockets on the host machine.
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66
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67 2. All of the "client" programs under discussion can also launch rvinterf
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68 themselves. An instance of rvinterf lauched in this manner becomes a child
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69 process of the "client" program, terminating together with it, and the two
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70 processes communicate via an unnamed and unbound socket pair.