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doc/TCH-special-feature: document written
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Mon, 21 Mar 2016 06:05:57 +0000
parents 7d3f0910aeb2
children fab048ff04b8
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1 How to play with FreeCalypso GSM firmware on a Neo Freerunner
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2 =============================================================
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3
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4 We have two entirely different firmware offerings for the Freerunner:
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5
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6 1. Leo2moko fw produced back in 2013-10: this is the only one suitable for
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7 end users. We also have leo2moko-debug which is a slightly hacked-up
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8 version of leo2moko with some additional debug features for developers;
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9 this version is for developers only; end users should stick with the
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10 original leo2moko-r1 aka moko12 from 2013-10.
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11
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12 2. The work-in-progress full-source gcc-built FC GSM fw can be built for
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13 multiple targets, and the gtamodem target is one of them - the original
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14 one, in fact.
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16 The flash+SRAM chip which FIC/Openmoko populated in their modems provides
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17 plenty enough RAM for the firmware's data space requirements, but not enough
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18 to run a complete firmware code image entirely from RAM, hence whichever fw
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19 version you would like to exercise, you need to flash it. There are two ways
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 864
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20 to flash modem firmware images in these smartphones: from inside the phone
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
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21 (from the application processor) or externally through a special serial cable
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22 inserted into the analog headset jack. The internal method is intended only
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23 for end users flashing released production-quality images; developers and
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24 tinkerers are expected to use the serial cable method.
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26 The serial cable wiring requirements for the GTA02 are the same as for Mot C1xx
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
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27 phones, thus the same cable can be used for both. The FreeCalypso project has
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28 endorsed UberWaves as our official vendor for serial cables; George at
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29 UberWaves now makes serial cables that are specifically certified for use with
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30 FreeCalypso. If you would like to order one, email uberwaves@gmail.com.
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31
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32 Please see the Firmware_Status write-up for the current status of our full-
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33 source gcc-built firmware. As you can read there, this fw is currently nowhere
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34 near being able to replace leo2moko. Therefore, if you are going to flash our
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35 gcc-built gsm-fw into your FR's modem, we expect that you are using your FR as
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36 a poor man's substitute for the not-yet-built FCDEV3B (a board we seek to build
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
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37 specifically for developers and not for end users), and are NOT expecting this
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38 experimental work-in-progress modem fw to work together with user-oriented
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39 application processor software like QtMoko.
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40
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41 If you would like to play with our experimental gcc-built gsm-fw using a GTA02
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42 modem as the hw platform, here are the instructions:
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43
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44 1. Build the firmware in the gtamodem-gsm configuration - see the Compiling
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45 document for more details;
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46
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47 2. You should get a flashImage.bin image built; now you need to flash it into
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48 your FR's modem. The serial cable method is highly recommended: the only
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49 thing you'll be able to do with our current non-working firmware is help us
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50 debug it, and the serial cable will be needed for the latter part anyway.
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51
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52 3. Run fc-loadtool the same way you would if you were flashing leo2moko;
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53
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54 4. The actual flash programming commands are a little different because the
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55 image is smaller and in a different format:
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56
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57 flash erase 0 0x160000
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58 flash program-bin 0 finlink/flashImage.bin
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59
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60 The second number in the flash erase command needs to be the size of
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61 flashImage.bin rounded up to a multiple of 64 KiB (the flash sector size in the
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62 GTA02 modem); 0x160000 is correct for the fw image size as of this writing, but
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63 please double-check it yourself before flashing. The 0 argument in the
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64 flash program-bin command is the flash offset at which the image should be
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65 programmed: it will always be 0 for FreeCalypso flashable fw images for gtamodem
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66 and other targets that have the Calypso boot ROM enabled in the hardware.
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67
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68 Once you have flashed our experimental fw into your modem, you can power-cycle
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69 the modem and see the new fw boot. You should have the serial cable connected,
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70 the serial channel enabled from the Freerunner's AP side and either rvtdump or
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71 rvinterf running on your PC or other development machine when you first power
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72 your modem up with the experimental fw in it: this way you will see the debug
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73 output as the firmware boots up.
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74
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75 Once the firmware has booted, it needs to be controlled via AT commands. The
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76 present fw presents its AT command interface on two channels on this target: on
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77 the MODEM UART going to the Freerunner's application processor and via RVTMUX.
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78 At the present stage of development, we highly recommend that you avoid running
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79 any GSM-driving software on the AP and exercise our work-in-progress fw solely
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parents: 864
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80 through the external serial interface on the headset jack, using rvinterf and
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81 fc-shell. The standard AT command interface on the dedicated MODEM UART is a
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82 feature which we plan to address properly only when we build our planned FCDEV3B
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parents: 864
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83 hardware, which will bring both UARTs out to the external host.
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84
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85 Assuming that you already have rvinterf running in a terminal window (you should
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86 have started it before you gave the modem power-on command from the AP side),
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parents: 864
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87 to exercise our firmware further, you will need to open another terminal window
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
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88 on your driving PC/laptop and run fc-shell. This program will connect to the
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parents: 864
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89 already running rvinterf process via a local socket, and it will enable you to
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parents: 864
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90 send various commands to the running fw on the target, the most important ones
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parents: 864
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91 being standard AT commands. Send the following sequence of AT commands to
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parents: 864
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92 bring up GSM functionality:
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93
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94 AT%SLEEP=2 -- disable deep sleep (doesn't work yet)
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parents: 864
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95 AT+CMEE=2 -- enable verbose error responses
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parents: 864
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96 AT+CFUN=1 -- enable radio and SIM interfaces
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 864
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97 AT+COPS=0 -- register to the default GSM network
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98
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99 Our fw is currently able to exercise all SIM interface functions (at least the
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100 obvious ones which I've tested), register with a live commercial GSM network
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101 using a legitimate SIM, and send and receive SMS using standard GSM 07.05 AT
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102 commands. Voice calls don't work yet: you can dial a MO call with the ATD
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103 command and you can place a MT call to the device under test from the network
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104 side and then answer it with ATA, these calls connect successfully, but the
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
Mychaela Falconia <falcon@ivan.Harhan.ORG>
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105 voice audio fails to pass through: nothing but noise is heard in the earpiece
7d3f0910aeb2 doc: Firmware_Status written, Freerunner-Howto & Pirelli-Howto updated
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 864
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106 speaker. See the Firmware_Status write-up for more information.
864
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Space Falcon <falcon@ivan.Harhan.ORG>
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107
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Space Falcon <falcon@ivan.Harhan.ORG>
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108 To reflash your modem back to stable and working leo2moko aka moko12, execute
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Space Falcon <falcon@ivan.Harhan.ORG>
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109 the following fc-loadtool commands:
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Space Falcon <falcon@ivan.Harhan.ORG>
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110
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Space Falcon <falcon@ivan.Harhan.ORG>
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111 flash erase 0 0x230000
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Space Falcon <falcon@ivan.Harhan.ORG>
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112 flash program-m0 leo2moko.m0
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Space Falcon <falcon@ivan.Harhan.ORG>
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113
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Space Falcon <falcon@ivan.Harhan.ORG>
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114 (Whichever firmware image you are flashing, the flash erase command needs to
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Space Falcon <falcon@ivan.Harhan.ORG>
parents:
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115 cover the range of flash sectors this image will occupy. You can erase more
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Space Falcon <falcon@ivan.Harhan.ORG>
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116 sectors up to 0x300000, the "natural" boundary of the flash area where fw
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Space Falcon <falcon@ivan.Harhan.ORG>
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117 images live, but I prefer to erase only the needed number of sectors: it is
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Space Falcon <falcon@ivan.Harhan.ORG>
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118 both faster and imposes less wear on the flash.)