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annotate doc/Pirelli-Howto @ 114:3454a514891b

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author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 06 Oct 2016 17:18:43 +0000
parents ffa25a27fa27
children 619a33e8425e
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1 Running FreeCalypso Magnetite firmware on the Pirelli DP-L10
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2 ============================================================
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3
97
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4 The Pirelli DP-L10 is a neat target for playing with FreeCalypso for two
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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 There is, however, one difference between our Citrine and Magnetite firmwares
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16 when it comes to running on the Pirelli without flashing: Citrine uses a
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17 RAM-based fake FFS, whereas Magnetite always requires a real FFS in flash, even
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18 when the firmware code image itself is entirely RAM-based. However, just like
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19 on the C139, we do NOT use the same FFS which is used by Pirelli's official
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20 firmwares - the latter contains nothing of use to our fw, hence it is best for
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21 us to use our own separate FreeCalypso Magnetite FFS.
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22
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23 The flash location that's been chosen for Magnetite FFS on the Pirelli is
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24 0x02480000 through 0x025FFFFF, i.e., offsets 0x480000 through 0x5FFFFF in the
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25 second flash bank. Pirelli's official firmwares use this flash area as
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26 temporary storage during OTA (over-the-air, probably WLAN in this case) fw
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27 reloads and leave it untouched at all other times, therefore as long as you are
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28 not doing firmware reloads over WLAN while in the "official mode", you can use
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29 your Pirelli phone for FreeCalypso experiments via fc-xram and go back to the
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30 regular fw in between, and the Magnetite FFS in the flash will be preserved
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31 from one fc-xram session to the next, not disturbed by Pirelli's fw.
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32
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33 Compiling
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34 =========
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35
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36 When compiling our Magnetite firmware for the Pirelli target, you will need to
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37 select the l1reconst configuration - it is the only currently available
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38 configuration that works on this target. Therefore, you configure.sh command
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39 should be:
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40
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41 ./configure.sh pirelli l1reconst
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42
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43 To build a RAM-loadable image for the Pirelli, run 'make ram' in the build
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44 directory created by the configure script - see the Compiling write-up for
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45 more details.
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46
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47 Because we have not deblobbed the G23M firmware component yet (the l1reconst
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48 configuration uses G23M binary blobs from TCS211/Sotovik), your Magnetite fw
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49 build will include FAX_AND_DATA and GPRS functionality. In the FreeCalypso
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50 environment where we are not doing WAP or MMS this functionality can only be
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51 exercised on targets that bring out a classic modem UART with the classic AT
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52 command interface to the external host, but the Pirelli is not one of those
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53 targets - hence on this target all FAX_AND_DATA and GPRS code is nothing but
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54 dead weight. We will only be able to remove this dead weight when and if we
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55 fully deblob all of L1 and G23M, so it will be a while before we get there,
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56 and we'll have to carry the dead weight until then.
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57
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58 Running on the target
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59 =====================
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60
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61 1. Connect a USB cable from your GNU/Linux PC/laptop to the phone. If the
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62 phone was off but the battery is present, it will go through a charger-plug
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63 power-on event; if the flash contains Pirelli's original fw, it will boot in
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64 the charging mode. If the battery is not present, the Calypso won't power
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65 on (it needs VBAT and can't run on VCHG power instead), but the /dev/ttyUSBx
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66 device will still show up, as the CP2102 USB-serial chip inside the phone is
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67 powered strictly from the USB side.
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68
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69 2. Run a command like the following:
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70
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71 fc-xram -h pirelli /dev/ttyUSB0 ramimage.srec rvinterf
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72
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73 Adjust the paths to your /dev/ttyUSBx device and your ramimage.srec as
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74 appropriate, and add rvinterf logging or other options as desired.
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75 Specifying rvinterf on the fc-xram command line directs fc-xram to exec
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76 rvinterf and pass the serial channel to it immediately as soon as the code
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77 image has been loaded into target RAM and jumped to; this direct passing of
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78 the serial channel from fc-xram to rvinterf is appropriate because the
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79 loaded fw will immediately start emitting binary trace packets in TI's RVTMUX
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80 format.
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81
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82 3. Induce the phone to execute its Calypso boot path: if the battery was
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83 removed, insert it now; if Pirelli's regular fw is running, execute its
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84 power-off sequence.
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85
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86 Once the Calypso chip in the Pirelli phone executes its boot path with fc-xram
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87 running, the boot path will be diverted and our experimental firmware will be
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88 loaded into target device RAM and jumped to. Our fw will now run, and the
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89 rvinterf process on the host will maintain communication with it.
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90
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91 FFS initialization
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92 ==================
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93
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94 When our Magnetite firmware boots, it will examine the state of the flash
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95 sectors in the area we have allocated for our aftermarket FFS. If this flash
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96 area is completely blank the first time Magnetite boots, as it should be if you
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97 have a "virgin" Pirelli phone, the FFS code in our fw will automatically perform
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98 what TI called the "preformat" operation: write undifferentiated FFS block
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99 headers (0xBF in the flags byte) into each flash sector. However, it won't
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100 automatically perform the "format" operation - instead you'll need to run
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101 fc-fsio to do the format and to populate this FFS with some necessary content.
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102 If you are not sure of the state of the Magnetite FFS flash area on your
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103 Pirelli, you can also run fc-fsio to examine it - so run fc-fsio either way.
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104 Run fc-fsio WITHOUT -p: let it connect to the rvinterf process you should
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105 already have running from fc-xram.
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106
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107 NOTE: the following instructions are based on the new version of fc-fsio that
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108 has not yet made its way into a packaged fc-host-tools release as of this
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109 writing. Therefore, please get the latest development version here:
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110
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111 https://bitbucket.org/falconian/freecalypso-tools
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112
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113 Once you are in fc-fsio, check the status of your FFS like this:
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114
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115 fsio> ls -l /
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116
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117 If the FFS is already formatted, you will get a listing of the root directory;
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118 if it is not formatted, you'll get an error like this:
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119
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120 opendir: FFS error 4 (EFFS_NOFORMAT: ffs not formatted)
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121
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122 To format and initialize your Pirelli Magnetite FFS, issue the following
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123 commands:
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124
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125 fsio> format /
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126 fsio> pirelli-magnetite-init
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127
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128 If you already have a formatted FFS from before, it is safe to rerun the
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129 pirelli-magnetite-init command, but not format. The format command will *not*
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130 work on an already formatted FFS; if you have a messed-up FFS and you would
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131 like to restart from a clean slate, erase the Magnetite FFS sectors with
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132 fc-loadtool:
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133
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134 loadtool> flash2 erase 480000 180000
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135
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136 Exercising the GSM functionality
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137 ================================
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138
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139 Once your FFS is good, open another terminal window on your driving PC/laptop
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140 and run fc-shell. This program will connect to the already running rvinterf
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141 process via a local socket, and it will enable you to send various commands to
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142 the running fw on the target, the most important ones being standard AT
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143 commands. Send the following sequence of AT commands to bring up GSM
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144 functionality:
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145
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146 AT+CMEE=2 -- enable verbose error responses
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147 AT+CFUN=1 -- enable radio and SIM interfaces
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148 AT+COPS=0 -- register to the default GSM network
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149
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150 When you are done playing with our experimental fw, you can either yank the
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151 battery and kill the host side rvinterf and fc-shell processes, or you can
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152 issue a 'tgtreset' command at the fc-shell prompt. The latter will cause the
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153 target to reset and boot back into its regular firmware.