FreeCalypso > hg > fc-magnetite

annotate doc/Pirelli-Howto @ 466:1524d182a2b2

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linker script for large flash: reserve the first 0x100 bytes of IRAM so we can experiment with routing interrupts through the internal ROM
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 25 Mar 2018 00:58:51 +0000
parents 5b6159d76b09
children 3608ce4a585a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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 When compiling our Magnetite firmware for the Pirelli target, you can select
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42 one of two configurations: l1reconst or hybrid; see the Modem-configs article
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43 for the explanation. In both cases the phone will act as an AT-command-
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44 controlled pseudo-modem: the LCD will stay dark and the buttons will do nothing,
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45 and you will need to control the GSM MS from your PC or other host system.
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47 Run './configure.sh pirelli l1reconst' or './configure.sh pirelli hybrid'
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48 depending on which configuration you would like to play with, then run
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49 'make ram' in the build directory created by the configure script - see the
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50 Compiling write-up for more details.
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51
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52 Because we have not yet produced a configuration with FAX_AND_DATA and GPRS
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53 disabled, your Magnetite fw build will include those components. In the
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54 FreeCalypso environment where we are not doing WAP or MMS this functionality
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55 can only be exercised on targets that bring out a classic modem UART with the
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56 classic AT command interface to the external host, but the Pirelli is not one
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57 of those targets - hence on this target all FAX_AND_DATA and GPRS code is
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58 nothing but dead weight. Now that we have deblobbed all of L1 with the
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59 exception of GPRS-specific modules, we could try building a hybrid config with
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60 GPRS and FAX_AND_DATA excluded, specifically for the benefit of Mot C1xx and
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61 Pirelli targets, but these legacy hardware targets are no longer a priority for
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62 the FreeCalypso family of projects.
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63
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64 Running on the target
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65 =====================
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66
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67 1. Connect a USB cable from your GNU/Linux PC/laptop to the phone. If the
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68 phone was off but the battery is present, it will go through a charger-plug
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69 power-on event; if the flash contains Pirelli's original fw, it will boot in
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70 the charging mode. If the battery is not present, the Calypso won't power
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71 on (it needs VBAT and can't run on VCHG power instead), but the /dev/ttyUSBx
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72 device will still show up, as the CP2102 USB-serial chip inside the phone is
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73 powered strictly from the USB side.
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74
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75 2. Run a command like the following:
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76
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77 fc-xram -h pirelli /dev/ttyUSB0 ramimage.srec rvinterf
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78
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79 Adjust the paths to your /dev/ttyUSBx device and your ramimage.srec as
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80 appropriate, and add rvinterf logging or other options as desired.
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81 Specifying rvinterf on the fc-xram command line directs fc-xram to exec
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82 rvinterf and pass the serial channel to it immediately as soon as the code
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83 image has been loaded into target RAM and jumped to; this direct passing of
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84 the serial channel from fc-xram to rvinterf is appropriate because the
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85 loaded fw will immediately start emitting binary trace packets in TI's RVTMUX
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86 format.
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87
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88 3. Induce the phone to execute its Calypso boot path: if the battery was
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89 removed, insert it now; if Pirelli's regular fw is running, execute its
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90 power-off sequence.
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91
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92 Once the Calypso chip in the Pirelli phone executes its boot path with fc-xram
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93 running, the boot path will be diverted and our experimental firmware will be
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94 loaded into target device RAM and jumped to. Our fw will now run, and the
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95 rvinterf process on the host will maintain communication with it.
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96
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97 FFS initialization
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98 ==================
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99
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100 When our Magnetite firmware boots, it will examine the state of the flash
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101 sectors in the area we have allocated for our aftermarket FFS. If this flash
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102 area is completely blank the first time Magnetite boots, as it should be if you
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103 have a "virgin" Pirelli phone, the FFS code in our fw will automatically perform
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104 what TI called the "preformat" operation: write undifferentiated FFS block
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105 headers (0xBF in the flags byte) into each flash sector. However, it won't
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106 automatically perform the "format" operation - instead you'll need to run
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107 fc-fsio to do the format and to populate this FFS with some necessary content.
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108 If you are not sure of the state of the Magnetite FFS flash area on your
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109 Pirelli, you can also run fc-fsio to examine it - so run fc-fsio either way.
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110 Run fc-fsio WITHOUT -p: let it connect to the rvinterf process you should
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111 already have running from fc-xram.
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112
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113 [NOTE: you need to be running FreeCalypso host tools from the fc-host-tools-r5
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114 release or later; earlier versions of fc-fsio won't work as described.]
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115
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116 Once you are in fc-fsio, check the status of your FFS like this:
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117
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118 fsio> ls -l /
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119
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120 If the FFS is already formatted, you will get a listing of the root directory;
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121 if it is not formatted, you'll get an error like this:
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122
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123 opendir: FFS error 4 (EFFS_NOFORMAT: ffs not formatted)
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124
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125 To format and initialize your Pirelli Magnetite FFS, issue the following
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126 commands:
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127
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128 fsio> format /
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129 fsio> pirelli-magnetite-init
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130
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131 If you already have a formatted FFS from before, it is safe to rerun the
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132 pirelli-magnetite-init command, but not format. The format command will *not*
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133 work on an already formatted FFS; if you have a messed-up FFS and you would
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134 like to restart from a clean slate, erase the Magnetite FFS sectors with
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135 fc-loadtool:
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136
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137 loadtool> flash2 erase 480000 180000
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138
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139 Exercising the GSM functionality
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140 ================================
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141
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142 Once your FFS is good, open another terminal window on your driving PC/laptop
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143 and run fc-shell. This program will connect to the already running rvinterf
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144 process via a local socket, and it will enable you to send various commands to
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145 the running fw on the target, the most important ones being standard AT
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146 commands. Send the following sequence of AT commands to bring up GSM
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147 functionality:
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148
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149 AT+CMEE=2 -- enable verbose error responses
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150 AT+CFUN=1 -- enable radio and SIM interfaces
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151 AT+COPS=0 -- register to the default GSM network
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152
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153 When you are done playing with our experimental fw, you can either yank the
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154 battery and kill the host side rvinterf and fc-shell processes, or you can
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155 issue a 'tgtreset' command at the fc-shell prompt. The latter will cause the
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156 target to reset and boot back into its regular firmware.