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annotate doc/Pirelli-Howto @ 556:39a226a06196

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documentation update for rebuilding the easy parts of GPF from source
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 19 Nov 2018 02:00:21 +0000
parents 3608ce4a585a
children
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1 Running FreeCalypso Magnetite firmware on the Pirelli DP-L10
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2 ============================================================
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3
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4 The Pirelli DP-L10 is a neat target for playing with FreeCalypso for a few
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5 reasons:
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6
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7 1. It has a USB port connected to one of Calypso's UARTs through a built-in
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8 CP2102 USB-serial adapter, eliminating the need for headset jack serial
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9 cables.
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10
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11 2. The huge RAM on this phone (8 MiB) makes it possible to run experimental GSM
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12 firmware images entirely in RAM without flashing - and we have successfully
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13 implemented this capability in FC Magnetite similarly to Citrine.
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14
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15 3. Running an experimental firmware image on the Pirelli requires nothing more
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16 than a laptop, a phone and a USB cable, and can therefore be done under
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17 less-than-ideal conditions while away from your proper FreeCalypso hardware
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18 lab with an FCDEV3B setup.
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19
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20 There is, however, one difference between our Citrine and Magnetite firmwares
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21 when it comes to running on the Pirelli without flashing: Citrine uses a
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22 RAM-based fake FFS, whereas Magnetite always requires a real FFS in flash, even
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23 when the firmware code image itself is entirely RAM-based. However, just like
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24 on the C139, we do NOT use the same FFS which is used by Pirelli's official
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25 firmwares - the latter contains nothing of use to our fw, hence it is best for
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26 us to use our own separate FreeCalypso Magnetite FFS.
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27
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28 The flash location that's been chosen for Magnetite FFS on the Pirelli is
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29 0x02480000 through 0x025FFFFF, i.e., offsets 0x480000 through 0x5FFFFF in the
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30 second flash bank. Pirelli's official firmwares use this flash area as
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31 temporary storage during OTA (over-the-air, probably WLAN in this case) fw
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32 reloads and leave it untouched at all other times, therefore as long as you are
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33 not doing firmware reloads over WLAN while in the "official mode", you can use
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34 your Pirelli phone for FreeCalypso experiments via fc-xram and go back to the
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35 regular fw in between, and the Magnetite FFS in the flash will be preserved
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36 from one fc-xram session to the next, not disturbed by Pirelli's fw.
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37
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38 Compiling
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39 =========
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40
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41 We don't have a FreeCalypso firmware offering for the Pirelli that makes it
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42 work as an untethered phone, and probably never will: there is too much
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43 undocumented peripheral hardware in this phone. Instead a Pirelli phone
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44 running our FC Magnetite firmware will act as voice pseudo-modem: the LCD will
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45 stay dark and the buttons will do nothing, and you will need to control the GSM
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46 MS from your PC or other host system via AT commands.
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47
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48 As explained in the Voice-pseudo-modem article, the two most sensible firmware
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49 configurations (in the ./configure.sh sense) for VPM targets are hybrid-vpm and
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50 l1reconst-chg. Because of the huge RAM, you can also compile and run our more
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51 traditional configurations intended for proper modems like FCDEV3B (l1reconst,
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52 hybrid or hybrid-osl), but all data services functionality of those fw configs
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53 (CSD and GPRS) will remain inaccessible (dead weight) when running on the
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54 Pirelli. Furthermore, our FreeCalypso battery charging code is only included
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55 in the special hybrid-vpm and l1reconst-chg configs, not in the traditional
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56 ones.
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57
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58 Run './configure.sh pirelli l1reconst-chg' or
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59 './configure.sh pirelli hybrid-vpm' depending on which configuration you would
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60 like to play with, then run 'make ram' in the build directory created by the
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61 configure script - see the Compiling write-up for more details.
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62
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63 Running on the target
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64 =====================
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65
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66 1. Connect a USB cable from your GNU/Linux PC/laptop to the phone. If the
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67 phone was off but the battery is present, it will go through a charger-plug
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68 power-on event; if the flash contains Pirelli's original fw, it will boot in
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69 the charging mode. If the battery is not present, the Calypso won't power
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70 on (it needs VBAT and can't run on VCHG power instead), but the /dev/ttyUSBx
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71 device will still show up, as the CP2102 USB-serial chip inside the phone is
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72 powered strictly from the USB side.
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73
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74 2. Run a command like the following:
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75
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76 fc-xram -h pirelli /dev/ttyUSB0 ramimage.srec rvinterf
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77
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78 Adjust the paths to your /dev/ttyUSBx device and your ramimage.srec as
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79 appropriate, and add rvinterf logging or other options as desired.
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80 Specifying rvinterf on the fc-xram command line directs fc-xram to exec
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81 rvinterf and pass the serial channel to it immediately as soon as the code
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82 image has been loaded into target RAM and jumped to; this direct passing of
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83 the serial channel from fc-xram to rvinterf is appropriate because the
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84 loaded fw will immediately start emitting binary trace packets in TI's RVTMUX
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85 format.
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86
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87 3. Induce the phone to execute its Calypso boot path: if the battery was
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88 removed, insert it now; if Pirelli's regular fw is running, execute its
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89 power-off sequence.
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90
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91 Once the Calypso chip in the Pirelli phone executes its boot path with fc-xram
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92 running, the boot path will be diverted and our experimental firmware will be
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93 loaded into target device RAM and jumped to. Our fw will now run, and the
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94 rvinterf process on the host will maintain communication with it.
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95
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96 FFS initialization
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97 ==================
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98
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99 When our Magnetite firmware boots, it will examine the state of the flash
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100 sectors in the area we have allocated for our aftermarket FFS. If this flash
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101 area is completely blank the first time Magnetite boots, as it should be if you
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102 have a "virgin" Pirelli phone, the FFS code in our fw will automatically perform
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103 what TI called the "preformat" operation: write undifferentiated FFS block
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104 headers (0xBF in the flags byte) into each flash sector. However, it won't
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105 automatically perform the "format" operation - instead you'll need to run
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106 fc-fsio to do the format and to populate this FFS with some necessary content.
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107 If you are not sure of the state of the Magnetite FFS flash area on your
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108 Pirelli, you can also run fc-fsio to examine it - so run fc-fsio either way.
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109 Run fc-fsio WITHOUT -p: let it connect to the rvinterf process you should
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110 already have running from fc-xram.
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111
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112 [NOTE: you need to be running FreeCalypso host tools from the fc-host-tools-r5
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113 release or later; earlier versions of fc-fsio won't work as described.]
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114
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115 Once you are in fc-fsio, check the status of your FFS like this:
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116
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117 fsio> ls -l /
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118
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119 If the FFS is already formatted, you will get a listing of the root directory;
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120 if it is not formatted, you'll get an error like this:
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121
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122 opendir: FFS error 4 (EFFS_NOFORMAT: ffs not formatted)
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123
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124 To format and initialize your Pirelli Magnetite FFS, issue the following
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125 commands:
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126
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127 fsio> format /
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128 fsio> pirelli-magnetite-init
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129
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130 If you already have a formatted FFS from before, it is safe to rerun the
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131 pirelli-magnetite-init command, but not format. The format command will *not*
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132 work on an already formatted FFS; if you have a messed-up FFS and you would
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133 like to restart from a clean slate, erase the Magnetite FFS sectors with
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134 fc-loadtool:
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135
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136 loadtool> flash2 erase 480000 180000
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137
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138 Exercising the GSM functionality
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139 ================================
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140
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141 Once your FFS is good, open another terminal window on your driving PC/laptop
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142 and run fc-shell. This program will connect to the already running rvinterf
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143 process via a local socket, and it will enable you to send various commands to
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144 the running fw on the target, the most important ones being standard AT
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145 commands. Send the following sequence of AT commands to bring up GSM
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146 functionality:
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147
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148 AT+CMEE=2 -- enable verbose error responses
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149 AT+CFUN=1 -- enable radio and SIM interfaces
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150 AT+COPS=0 -- register to the default GSM network
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151
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152 When you are done playing with our experimental fw, you can either yank the
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153 battery and kill the host side rvinterf and fc-shell processes, or you can
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154 issue a 'tgtreset' command at the fc-shell prompt. The latter will cause the
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155 target to reset and boot back into its regular firmware.
511
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156
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157 A recent addition to our VPM firmware configuration is automatic power-off: if
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158 you simply disconnect USB while our FC Magnetite VPM fw is running, without
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159 issuing any tgtreset or poweroff commands and without yanking the battery, our
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160 firmware should detect the disconnection of USB and power off the phone within
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161 10 s.