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fc-shell tch-dl command implementation: brown paper bag
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Sun, 20 Mar 2016 23:07:46 +0000
parents 0ee75fdf082f
children e1d670ec6012
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7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
Mychaela Falconia <falcon@ivan.Harhan.ORG>
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1 The goal of the gcc-built Calypso GSM firmware project contained in the gsm-fw
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
Mychaela Falconia <falcon@ivan.Harhan.ORG>
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2 directory of this source tree is to replace the Windows-built firmwares which
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
Mychaela Falconia <falcon@ivan.Harhan.ORG>
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3 have been produced in other subprojects under the FreeCalypso umbrella - see
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
Mychaela Falconia <falcon@ivan.Harhan.ORG>
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4 leo2moko and tcs211-c139. Our leo2moko project has produced a production
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
Mychaela Falconia <falcon@ivan.Harhan.ORG>
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5 quality modem fw image for the Openmoko GTA02, while a C139 reflashed with
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
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6 tcs211-c139 is the first dumbphone in history that can still function as an
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
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7 untethered phone after having had its fw replaced with an indie one that bears
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
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8 no relation to the manufacturer's original - but those TCS211-based
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9 Windows-built projects have severe limitations. Much of the firmware code base
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
Mychaela Falconia <falcon@ivan.Harhan.ORG>
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10 in those versions is in the form of unmodifiable binary object libraries, and
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
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11 the Windows-based configuration and build system is incompatible with the
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
Mychaela Falconia <falcon@ivan.Harhan.ORG>
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12 long-term needs of FreeCalypso development.
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13
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
Mychaela Falconia <falcon@ivan.Harhan.ORG>
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14 The present FreeCalypso GSM fw project seeks to rectify the situation by
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
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15 replacing the blob-laden, Windows-built firmware with a version that is built
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
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16 from full source (no binary blobs) with gcc, with an entirely different
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17 configuration mechanism that actually suits our needs. Because one of the key
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
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18 goals of this project is to build the firmware from *full source*, the binary
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19 object versions of L1 (GSM Layer 1) and G23M (layers 2&3 of the protocol stack)
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
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20 featured in our reference TCS211 fw could not be reused. Instead this project
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
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21 uses versions of L1 and G23M (and some other pieces) that have been lifted from
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
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22 the firmware for TI's other chipset (LoCosto) and backported to Calypso.
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24 The current state of the project is that we have made remarkable progress, but
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25 are unfortunately nowhere near the goal of actually being able to replace TCS211
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26 for practical use. Specifically:
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27
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28 * Only the bare minimal modem functionality for the voice+SMS subset has been
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29 integrated so far. "Modem" means our fw can only be controlled via AT
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30 commands; no UI code (as in LCD+keypad) has been integrated at all. But it
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31 is not a true modem either as none of the data functions have been integrated
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32 yet: no CSD, no fax, no GPRS. Thus it is an AT-command-controlled voice+SMS
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33 pseudo-modem.
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34
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35 * The firmware can be built for the following targets:
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36
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37 Mot C11x/12x
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
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38 Mot C139/140
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39 Mot C155/156
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
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40 Openmoko GTA01/02
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41 Pirelli DP-L10
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42
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43 All configurations are built from the same source tree. The firmware
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
Mychaela Falconia <falcon@ivan.Harhan.ORG>
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44 functions identically on all supported targets. Because there is no UI code
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45 integrated yet, the LCD stays dark and the buttons do nothing on those target
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46 devices that have such hardware.
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47
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48 * Most of our supported target devices have only one practically accessible
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49 serial port (UART). Our firmware presents TI's RVTMUX interface on this
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50 UART; the operator is expected to interface to it by running our rvinterf
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51 tools on the host PC/laptop. One of the utilities in the rvinterf suite is
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52 fc-shell; this tool is used to send AT commands to the running firmware,
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53 which is the only way to control its operation.
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54
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55 * With a valid SIM card inserted and a valid IMEISV configured, a GSM device
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56 running our firmware can successfully connect to live commercial GSM networks
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57 and send and receive SMS.
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58
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59 * Voice calls are broken: using appropriate AT commands, one can dial outgoing
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60 calls and answer incoming ones, and they connect as they should. However,
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61 the voice audio path is broken: nothing but noise is heard in the earpiece
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62 speaker. We reason that the problem must be somewhere in L1, which has been
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63 backported from LoCosto to Calypso in a rather Frankensteinian manner.
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64
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65 * Deep sleep is broken and needs to be disabled with AT%SLEEP=2; the breakage
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66 is likewise assumed to be somewhere in L1.
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67
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68 The two current points of breakage in L1 (broken deep sleep and broken voice
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69 calls) are deemed to be show-stoppers, i.e., we are not going to progress this
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70 work in any other direction until these two are fixed. And we currently see
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71 only two possible ways to fix these L1 issues:
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73 Option 1: find and obtain another copy of TCS211 that has its L1 component in
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74 source form, or a separate L1-by-itself source that would be compatible with
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75 Calypso DSP ROM 3606 and with the TCS211 fw architecture.
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77 Option 2: painstakingly reconstruct a TCS211-fitting version of L1 from the
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78 disassembly of the available binary objects, by taking LoCosto L1 sources and
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79 massaging them until they compile into object code that matches our TCS211
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80 reference.
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81
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82 Option 1 involves more prayer than actionable work, while Option 2 is currently
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83 being worked on in another subproject of FreeCalypso - see tcs211-l1-reconst.
999
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84
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85 Target-specific usage instructions
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86 ==================================
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87
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88 If you would like to play with our work-in-progress firmware and check it out
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89 for yourself, see the following target-specific instructions:
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90
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91 Mot C1xx (Compal) FC-on-Compal
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92 Openmoko GTA01/02 Freerunner-Howto
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93 Pirelli DP-L10 Pirelli-Howto