FreeCalypso > hg > freecalypso-tools

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doc/Flash-boot-defect article removed (no longer relevant) This article is no longer relevant because the issue in question only affected one (1) defective FCDEV3B board which was not and never will be sold.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 26 Oct 2018 07:11:08 +0000
parents ac49d8814893
children 05dc91d011a6
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Mychaela Falconia <falcon@freecalypso.org>
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1 TI's Calypso GSM/GPRS baseband processor chip has not one but two UART serial
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Mychaela Falconia <falcon@freecalypso.org>
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2 ports, called "MODEM" and "IrDA" in the hardware documentation. In hardware
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Mychaela Falconia <falcon@freecalypso.org>
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3 terms, both support basic data-leads-only UART operation at a fixed baud rate,
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Mychaela Falconia <falcon@freecalypso.org>
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4 but their extended capabilities differ: the IrDA UART adds IrDA capability (no
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Mychaela Falconia <falcon@freecalypso.org>
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5 surprise), whereas the MODEM UART adds hardware flow control and autobaud. If
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Mychaela Falconia <falcon@freecalypso.org>
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6 one is not implementing an actual IrDA interface, then the so-called "IrDA"
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Mychaela Falconia <falcon@freecalypso.org>
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7 UART becomes a strict subset of the MODEM one in terms of hw capabilities -
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Mychaela Falconia <falcon@freecalypso.org>
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8 just an extra UART, but a somewhat less capable one.
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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 In a classic modem design such as that present in the GTA0x smartphones made by
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Mychaela Falconia <falcon@freecalypso.org>
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11 FIC/Openmoko, the Calypso presents a standard AT command interface on its MODEM
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Mychaela Falconia <falcon@freecalypso.org>
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12 UART port. (In the case of GTA0x phones this serial channel is wired to the
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Mychaela Falconia <falcon@freecalypso.org>
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13 phone's application processor; in a standalone modem it would be wired to a
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Mychaela Falconia <falcon@freecalypso.org>
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14 USB-serial chip or even to a classic RS-232 DB25 port.) However, what is less
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Mychaela Falconia <falcon@freecalypso.org>
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15 known is that the standard firmware for such modems simultaneously presents an
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Mychaela Falconia <falcon@freecalypso.org>
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16 entirely different interface on the IrDA UART - an interface intended for
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Mychaela Falconia <falcon@freecalypso.org>
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17 development, debugging and factory production testing (which includes RF
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Mychaela Falconia <falcon@freecalypso.org>
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18 calibration and IMEI etc programming), rather than for "normal" end users.
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19
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20 Normally this debug/development serial interface (called RVTMUX as will be
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Mychaela Falconia <falcon@freecalypso.org>
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21 explained momentarily) is hidden from "ordinary" users - for example, on FIC
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Mychaela Falconia <falcon@freecalypso.org>
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22 GTA0x phones it is wired to the analog headset jack through a hardware switch
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Mychaela Falconia <falcon@freecalypso.org>
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23 which needs to be enabled through a GPIO signal from the AP. On Mot C139 and
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Mychaela Falconia <falcon@freecalypso.org>
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24 its siblings the situation is similar: one needs to key in the secret magic
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Mychaela Falconia <falcon@freecalypso.org>
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25 sequence **16379#, and then the firmware presents a hidden menu for switching
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Mychaela Falconia <falcon@freecalypso.org>
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26 the analog headset jack between its "normal" function and the UART carrying
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Mychaela Falconia <falcon@freecalypso.org>
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27 RVTMUX.
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28
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29 But there also exist some oddball devices on which the RVTMUX interface is
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Mychaela Falconia <falcon@freecalypso.org>
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30 presented "in your face". The Pirelli DP-L10 phone has a USB charging port
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Mychaela Falconia <falcon@freecalypso.org>
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31 which is also wired (through a CP2102 USB-serial chip) to the IrDA UART on the
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Mychaela Falconia <falcon@freecalypso.org>
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32 Calypso - that's right, IrDA, not MODEM - a design decision with which this
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Mychaela Falconia <falcon@freecalypso.org>
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33 hacker strongly disagrees. (It'll definitely be wired to the MODEM UART
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Mychaela Falconia <falcon@freecalypso.org>
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34 instead on our own semi-clone of this phone, but I digress.) Apparently Foxconn
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Mychaela Falconia <falcon@freecalypso.org>
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35 (the designers of this phone) had no desire to provide a standard AT command
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Mychaela Falconia <falcon@freecalypso.org>
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36 interface, and instead the only "official" way to use the "data" function of
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Mychaela Falconia <falcon@freecalypso.org>
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37 their USB port (rather than the charging function) is for their "PC sync"
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Mychaela Falconia <falcon@freecalypso.org>
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38 feature, i.e., their proprietary Weendoze software. And guess what, their
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Mychaela Falconia <falcon@freecalypso.org>
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39 proprietary "PC sync" feature works over TI's RVTMUX interface, as that is
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Mychaela Falconia <falcon@freecalypso.org>
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40 what's presented on Calypso's IrDA UART behind the CP2102!
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Mychaela Falconia <falcon@freecalypso.org>
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41
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Mychaela Falconia <falcon@freecalypso.org>
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42 OK, so what is this RVTMUX? RV stands for RiViera, an application framework
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Mychaela Falconia <falcon@freecalypso.org>
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43 which TI added to their GSM firmware suite in the early 2000s, T stands for
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Mychaela Falconia <falcon@freecalypso.org>
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44 trace, and MUX stands for multiplexor. It's a binary packet interface, although
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Mychaela Falconia <falcon@freecalypso.org>
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45 many of these packets contain ASCII debug messages inside. The framing format
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Mychaela Falconia <falcon@freecalypso.org>
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46 is the same in both directions: each packet begins and ends with an STX (0x02)
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Mychaela Falconia <falcon@freecalypso.org>
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47 byte, all payload bytes except 0x02 and 0x10 are sent literally, and there is a
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Mychaela Falconia <falcon@freecalypso.org>
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48 DLE (0x10) byte prepended before any 0x02 or 0x10 in the payload. It's the same
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Mychaela Falconia <falcon@freecalypso.org>
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49 general principle as asynchronous HDLC (RFC 1662): packets can contain any
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Mychaela Falconia <falcon@freecalypso.org>
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50 binary data, and the framing provides packet boundaries - although TI's version
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Mychaela Falconia <falcon@freecalypso.org>
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51 is a little less robust than async-HDLC when it comes to recovering after lost
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Mychaela Falconia <falcon@freecalypso.org>
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52 synchronization.
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53
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54 The firmware suite component responsible for actually sending and receiving
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Mychaela Falconia <falcon@freecalypso.org>
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55 these packets over the assigned UART port (usually IrDA, but can be MODEM too,
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Mychaela Falconia <falcon@freecalypso.org>
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56 as on Compal phones for example) is called RVT (RiViera Trace), and it
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Mychaela Falconia <falcon@freecalypso.org>
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57 implements a MUX function. There are several logical channels multiplexed over
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Mychaela Falconia <falcon@freecalypso.org>
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58 one physical serial port, and the first byte of every packet indicates which
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Mychaela Falconia <falcon@freecalypso.org>
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59 logical channel it belongs to. Any component within the GSM firmware suite can
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Mychaela Falconia <falcon@freecalypso.org>
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60 send packets to RVT for transmission on this serial interface, and can also
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Mychaela Falconia <falcon@freecalypso.org>
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61 register to receive packets beginning with a particular type ID byte.
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62
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63 Debug trace output
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Mychaela Falconia <falcon@freecalypso.org>
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64 ==================
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Mychaela Falconia <falcon@freecalypso.org>
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65
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Mychaela Falconia <falcon@freecalypso.org>
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66 All GSM device firmwares that are based on TI's Calypso chipset reference fw
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Mychaela Falconia <falcon@freecalypso.org>
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67 continuously emit quite voluminous debug trace output on their RVTMUX serial
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Mychaela Falconia <falcon@freecalypso.org>
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68 port, whether it is hidden or exposed on a given device. Like all RVTMUX
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Mychaela Falconia <falcon@freecalypso.org>
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69 traffic, this debug trace output takes the form of binary packets as explained
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Mychaela Falconia <falcon@freecalypso.org>
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70 above, but the content of these packets is mostly ASCII with some binary header
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Mychaela Falconia <falcon@freecalypso.org>
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71 bytes prepended. FreeCalypso host utility rvtdump captures all serial output
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Mychaela Falconia <falcon@freecalypso.org>
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72 from a GSM device's RVTMUX port, parses the packet structure and displays this
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Mychaela Falconia <falcon@freecalypso.org>
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73 output in line-oriented pure ASCII with all binary parts decoded.
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74
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75 Test Mode commands
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76 ==================
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Mychaela Falconia <falcon@freecalypso.org>
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77
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78 The other major use of the RVTMUX interface is sending so-called Test Mode
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Mychaela Falconia <falcon@freecalypso.org>
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79 commands from an external host to a running GSM device. Depending on the
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Mychaela Falconia <falcon@freecalypso.org>
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80 firmware version, a GSM device can be commanded to do any of the following
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Mychaela Falconia <falcon@freecalypso.org>
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81 things through this mechanism:
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82
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83 * Exercise RF test modes, e.g., transmit continuously at a set frequency and
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Mychaela Falconia <falcon@freecalypso.org>
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84 power level;
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Mychaela Falconia <falcon@freecalypso.org>
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85 * Read and write arbitrary memory locations in the Calypso ARM7 address space;
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Mychaela Falconia <falcon@freecalypso.org>
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86 * Read and write ABB chip registers;
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Mychaela Falconia <falcon@freecalypso.org>
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87 * Reboot or power off;
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Mychaela Falconia <falcon@freecalypso.org>
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88 * Access and manipulate the device's flash file system (FFS).
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Mychaela Falconia <falcon@freecalypso.org>
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89
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Mychaela Falconia <falcon@freecalypso.org>
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90 In the segment of history of interest to us TI has produced two different
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Mychaela Falconia <falcon@freecalypso.org>
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91 target firmware components that can receive, interpret and act upon Test Mode
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Mychaela Falconia <falcon@freecalypso.org>
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92 command packets:
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Mychaela Falconia <falcon@freecalypso.org>
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93
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94 * The original Test Mode component of Layer 1, called L1TM or TML1: this
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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95 component handles all RF test modes (needed for RF calibration on device
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Mychaela Falconia <falcon@freecalypso.org>
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96 production lines), and originally it also implemented memory and ABB register
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Mychaela Falconia <falcon@freecalypso.org>
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97 read and write commands, and provided access to TMFFS1 (see below). In the
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Mychaela Falconia <falcon@freecalypso.org>
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98 original implementation this component registered itself as the handler for
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Mychaela Falconia <falcon@freecalypso.org>
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99 the "TM" RVTMUX channel (RVT packet type 0x14), so it would receive all TM
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Mychaela Falconia <falcon@freecalypso.org>
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100 packets sent to the device.
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Mychaela Falconia <falcon@freecalypso.org>
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101
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102 * Enhanced Test Mode (ETM) is a later invention. It registers itself (instead
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Mychaela Falconia <falcon@freecalypso.org>
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103 of the old TM in L1) with RVT as the handler for the "TM" RVTMUX channel, and
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Mychaela Falconia <falcon@freecalypso.org>
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104 then provides a registration service of its own, such that various components
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Mychaela Falconia <falcon@freecalypso.org>
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105 in the fw suite can register to receive external command packets passing
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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106 first through RVT, then through ETM, and can send responses passing through
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
107 ETM, then through RVT back to the external host. If a given fw version
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
108 contains both ETM and L1TM, then L1TM registers itself with ETM; an external
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
109 host would send exactly the same binary command packets to exercise RF test
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
110 modes, but inside the firmware they now pass through ETM on their way to L1TM.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
111
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
112 The ETM_CORE module contained within ETM itself provides some low-level debug
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113 commands: by sending the right binary command packets to the GSM device via the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
114 RVTMUX serial channel, an external host can examine or modify any memory
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
115 location and any hardware register, cause the device to reset, etc. Prior to
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
116 ETM some of these functions (but not all) could be exercised through older TM3
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
117 commands, but in FreeCalypso we became familiar with the ETM versions of these
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 commands long before the older ones because we got the ETM component in full
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119 source form, whereas our copy of TCS211 (TI's reference fw) has L1TM in a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 binary library.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 Our TCS211/leo2moko reference fw has both ETM and L1TM, thus it accepts both
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 ETM and TM3 command packets. ETM commands (including TMFFS2, see below) work
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 on Pirelli's fw, but Mot/Compal's original fw for the C139 has only the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 original non-enhanced Test Mode, not ETM.
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 FFS access via TM/ETM
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 =====================
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 One of the essential facilities provided in one form or another in all known
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 incarnations of the Test Mode mechanism is the ability to access and manipulate
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 the GSM device's flash file system (FFS). See TIFFS-Overview for a description
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 of this file system. TI's TMFFS1 and TMFFS2 protocols provide a command and
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 response packet interface to the FFS API functions inside the fw, and enable an
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 external host connected to the GSM device via the RVTMUX channel to perform
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 arbitrary read and write operations on the device file system.
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 In the segment of history of interest to us TI has produced two different
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 and entirely incompatible versions of the TMFFS protocol: TMFFS1 and TMFFS2.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 Or rather, what is now called TMFFS1 was originally just TMFFS, and then came
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 TMFFS2. TMFFS2 works only through ETM, whereas TMFFS1 predates ETM: in the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 original implementation the tm_ffs() function in the FFS code was called from
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 L1TM code.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 Our copy of TCS211 reference fw includes the source for both TMFFS1 and TMFFS2;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 it is theoretically possible to build a firmware image that includes both TMFFS
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 versions (they won't conflict because they respond to different command
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 packets), but it is pretty clear that TI never intended to have both enabled
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 at the same time. Our copy of TCS211 came with TMFFS1 enabled and we didn't
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 change it when we made the moko12 (leo2moko-r1) fw release for the Openmoko
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 community (the previous proprietary mokoN firmwares also implement TMFFS1),
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 but we have subsequently switched to TMFFS2 for our current TCS211-based work.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 Pirelli's fw implements TMFFS2: we don't have any source for this fw, but our
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 FreeCalypso host utilities written to talk the TMFFS2 protocol based on our
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 available TCS211 source work beautifully when run against Pirelli's fw.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 Use in FreeCalypso
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 ==================
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 The FreeCalypso project has adopted the same general firmware architecture as
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 that exhibited by TI's standard firmwares from the Moko/Pirelli time frame. We
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 use TI's RiViera framework lifted directly out of the TCS211 reference fw, and
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 that includes the RVT module and the RVTMUX interface it presents. Our GSM fw
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 emits the same 3 kinds of debug traces (RV, L1 and GPF) as the pre-existing
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 firmwares with which we are seeking functional parity, and for Test Mode
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 functionality we have the option of including ETM, TMFFS1 and/or TMFFS2 in our
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 firmware builds. (Both TMFFS versions require ETM in our implementation, and
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 it is possible to build a firmware image with both included.)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 We have adopted ETM and TMFFS2 as the standard combination for FreeCalypso,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 i.e., ETM_CORE for memory and ABB register reads and writes and TMFFS2 for
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 external FFS access. We needed to develop our own host tools for operating on
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 GSM device FFS via one of the two TMFFS protocols, and after studying the fw
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 source implementing both, I (Space Falcon) came to the conclusion that TMFFS2
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 is both more capable and more reliable; my guess is that TMFFS1 was likely kept
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 around only because some of TI's crappy Weendoze host software depended on it.
18
d9307880f59f doc/RVTMUX: reference to TI's tmffs.c source updated for the repository split
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
178 (See chipsetsw/drivers/drv_app/ffs/board/tmffs.c in leo2moko or tcs211-fcmodem
d9307880f59f doc/RVTMUX: reference to TI's tmffs.c source updated for the repository split
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
179 if you would like to judge for yourself.)
0
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 We have the following host tools for communicating with TI-based GSM firmwares
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 (both our own and some of the existing proprietary ones):
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 rvtdump This tool produces a human-readable dump of all output emitted
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 by a TI-based GSM fw in the form of RVTMUX binary packets. It
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 can also log this dump to a file.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 rvinterf This tool is a superset of rvtdump: it not only dumps and/or
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 logs all output from the GSM fw, but also provides a mechanism
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 for sending command packets to it.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 Rvinterf is the engine behind the following host tools that send Test Mode
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 commands to a target:
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 fc-tmsh This is our basic tool for sending Test Mode commands to a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 running GSM fw. It is strictly asynchronous in that commands
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 entered by the operator get sent to the target, and any response
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 packets received from the target are displayed as they come in.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 The tool has no knowledge of any correspondence between commands
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 being sent and whatever responses they should elicit, i.e., it
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 is perfectly suited for experimental discovery of firmware
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 behaviour in response to Test Mode commands.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 This tool was written before we realized that there was/is an
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 older, more basic Test Mode predating ETM, hence in many place
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 we say "ETM" when we really should have said "TM". Oh well...
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 fc-fsio This tool speaks the TMFFS2 protocol and allows a user or
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 developer to perform a wide range of operations on the file
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 system of a GSM device. It operates synchronously, i.e., it
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 sends ETM/TMFFS2 commands and expects responses in strict
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 lock-step; a single user command may translate into a large
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 number of ETM/TMFFS2 command packet exchanges.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 AT commands over RVTMUX
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 =======================
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
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217
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218 There is one more use to which we put the RVTMUX debug serial interface that is
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219 an original FreeCalypso invention: communicating with the AT command interpreter
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220 (ATI). TI's original architecture assumes that if a product is to offer a
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221 standard AT command interface (the product is either a GSM/GPRS modem for which
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222 this AT command interface is the sole mode of usage or a feature phone that
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223 offers a data port as one of its features), then it will be presented on a
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224 dedicated UART separate from RVTMUX.
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225
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226 However, many of our target devices have only one UART practically accessible,
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227 and even when we use Openmoko's modem as our development platform, the RVTMUX
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228 interface is more convenient because it connects externally, whereas the MODEM
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229 UART is connected to the application processor of the smartphone. Therefore,
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230 we developed a way to pass AT commands over RVTMUX. We created a new RVTMUX
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231 channel for this interface and assigned it RVT packet type 0x1A. Packets sent
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232 from an external host to the GSM device carry AT commands and SMS string input,
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233 whereas packets flowing the other way carry ATI's responses to commands and
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234 asynchronous notifications such as incoming calls.
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235
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236 The host utility for talking AT commands to a FreeCalypso GSM device via RVTMUX
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237 is fc-shell; it works via rvinterf just like fc-fsio and fc-tmsh.
223
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238
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239 Keepalive mechanism
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240 ===================
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241
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242 Another FreeCalypso addition to TI's RVTMUX interface is our optional keepalive
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Mychaela Falconia <falcon@freecalypso.org>
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243 mechanism. The FreeCalypso family includes many subprojects, and one of these
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244 subprojects involves running modem-like firmware (control via AT commands only,
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245 no local UI) on Mot C1xx phones. Having a device that was originally made to
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Mychaela Falconia <falcon@freecalypso.org>
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246 be a phone with LCD and buttons turn into a serially-controlled pseudo-modem
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247 (LCD stays dark, buttons do nothing) feels quite weird, and this situation is
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Mychaela Falconia <falcon@freecalypso.org>
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248 exacerbated on low-end Mot C1xx models that have small RAM and thus require our
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Mychaela Falconia <falcon@freecalypso.org>
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249 pseudo-modem fw to be flashed.
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Mychaela Falconia <falcon@freecalypso.org>
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250
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251 Our optional keepalive mechanism is intended for the latter scenario. There
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Mychaela Falconia <falcon@freecalypso.org>
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252 will be an optional feature added to pseudo-modem fw builds for C1xx targets
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253 (not yet implemented as of this writing) to have the firmware send periodic
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Mychaela Falconia <falcon@freecalypso.org>
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254 keepalive queries out the serial port, to see if there is a running rvinterf
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Mychaela Falconia <falcon@freecalypso.org>
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255 process on the other end of the wire, and automatically power off if there is
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256 no keepalive response.
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257
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258 Code has been added to rvinterf to respond with a keepalive answer packet when
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Mychaela Falconia <falcon@freecalypso.org>
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259 a keepalive query packet is received; the feature has been implemented on the
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Mychaela Falconia <falcon@freecalypso.org>
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260 rvinterf side ahead of the target fw so that when and if we do get around to
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Mychaela Falconia <falcon@freecalypso.org>
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261 implementing the target side, the necessary rvinterf support will be there
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Mychaela Falconia <falcon@freecalypso.org>
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262 waiting for us.