FreeCalypso > hg > freecalypso-sw

annotate README @ 858:4c6e7ada647b

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compressed trace decoder almost fully implemented
author Space Falcon <falcon@ivan.Harhan.ORG>
date Sat, 02 May 2015 08:08:26 +0000
parents 615fb8847d3f
children 78c894c7c471
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1 What this project is about
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2 ==========================
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3
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4 Welcome to FreeCalypso. The goal is this project is to produce a Free Dumb
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5 Phone - not yet another smartphone (free or otherwise), but a "dumbphone",
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6 i.e., a traditional cellular telephone handset just like we all had and enjoyed
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7 back in the 1990s - a device with just enough hardware resources to make and
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8 receive traditional phone calls on a standard GSM network, and not one iota
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9 more. No power-hungry application processors, just have one baseband processor
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10 that does everything from running the GSM protocol stack to responding to the
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11 user pressing buttons on the traditional numeric dialpad. No big screens with
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12 power-hungry backlights, just a little LCD to display who is calling and the
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13 current date and time - I use my cellphone as a pocketwatch too, so my wrists
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14 stay free.
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15
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16 But we seek to build a "dumbphone" with one VERY SPECIAL twist: namely,
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17 operational firmware for the phone (which includes everything from the UI down
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18 to GSM Layer 1, as there is no separate baseband processor) available to every
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19 end user in the form of full source code. Hence it will be a Free Dumb Phone.
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20 We seek to achieve this "special twist" by doing the following:
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21
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22 * We'll use the ancient TI Calypso chipset for our Free Dumb Phone instead of
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23 whatever is the current offering from MTK or other cellular chipset company
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24 du jour. TI stopped making these chips ages ago, and got out of the cellular
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25 baseband chipset business altogether, but we can still source these chips in
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26 5-digit quantities on the Chinese surplus market.
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27
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28 * Because we'll be using a baseband chipset from the surplus market made by a
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29 company that long bit the dust, we will not be getting any official firmware
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30 releases from any vendor. Therefore, there is no one to sign any NDAs with,
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31 and there is no one to tell us what we can or cannot do with the firmware as
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32 we won't be getting any official firmware in the first place.
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33
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34 * Our Free Dumb Phone will run free firmware which we put together ourselves.
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35 When TI completely exited the cellular baseband chipset business, closed all
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36 their offices involved with that work and laid off all of the responsible
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37 employees, they broke their firmware into pieces and threw the pieces in the
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38 trash. We have picked these shattered pieces out of the trash dumpster, and
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39 like anything else found in a dumpster, these abandonware pieces are
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40 effectively in the public domain, and any person in the world is free to do
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41 with them as she pleases.
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42
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43 The "shattered pieces" aspect of the firmware needs to be re-emphasized. TI's
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44 complete firmware suite for their Calypso chipset, also known as TCS2.1.1 or
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45 TCS211, has *not* survived the disbanding of its maker company in an intact
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46 form. Shattered bits and pieces are all we've been able to gather through our
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47 dumpster diving efforts.
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48
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49 Reconstructing fully-functional firmware for the Calypso from the available
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50 broken pieces is where the bulk of the hard work in our project is. There is
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51 another project (bb.osmocom.org) seeking to produce similarly-functional fw by
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52 rewriting it completely from scratch with a totally different architecture, but
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53 the lead developer of the present FreeCalypso project has chosen the
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54 reconstruction approach as more reliable and more likely to produce the desired
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55 result.
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56
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57 Hardware vs. software
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58 =====================
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59
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60 Our goal is to produce a complete and usable cellphone product. Such a product
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61 requires both hardware and software (firmware). We need to produce both. We
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62 could do the hw and fw subprojects in either order, but we have chosen to work
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63 on the firmware first. By doing the fw first, we will get to exercise it on
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64 some existing phones that use the same Calypso chipset; doing the hw ahead of
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65 the fw would give us a fancy paperweight.
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66
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67 Current status
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68 ==============
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69
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70 We are currently using the Calypso GSM modem in the Openmoko GTA02 smartphone
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71 as our bring-up vehicle. We have our own firmware suite, compiled 100% from
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72 source with gcc (no blobs or proprietary compiler toolchains!), but we have not
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73 yet reintegrated the full GSM protocol stack in this project. (The leo2moko
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74 side project doesn't count.) But we are getting close: we've got the
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75 FreeNucleus RTOS by XVilka as a working replacement for the binary-only version
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76 of Nucleus used by TI, and we've got the following parts of TI's original
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77 firmware suite integrated and working:
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78
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79 * RiViera framework and everything that runs under it, including TI's original
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80 FFS (flash file system), RVTMUX serial channel and ETM (Enhanced Test Mode).
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81 This part has been found in a TCS211 semi-src package.
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82
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83 * GPF (Condat's protocol stack framework) - TI used it mostly as binary libs,
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84 even internally, and we had to reconstruct it from pieces. Some parts of GPF
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85 had to be reconstructed from disassembly. But it works beautifully now.
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86
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87 * GSM Layer 1 code - we took the version from the LoCosto source (no official
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88 Calypso L1 source could be found) and backported it from LoCosto to Calypso.
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89
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90 We are now working on reintegrating the rest of the GSM protocol stack code,
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91 also taking it from the LoCosto source (the only available full source) and
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92 reintegrating it to build in our FreeCalypso environment, targeting Calypso
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93 instead of LoCosto.
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94
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95 We have also produced some host tools for loading firmware into Calypso GSM
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96 devices, for communicating with running firmwares over the RVTMUX interface,
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97 and for manipulating TI's flash file system. See README.hosttools for the
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98 details.
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99
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100 Source tree
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101 ===========
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102
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103 The subtrees of this source tree are as follows:
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104
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105 gsm-fw The main FreeCalypso GSM firmware work, see above.
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107 target-utils This tree contains code that runs on Calypso targets, but is
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108 not regular firmware (gsm-fw) or a part thereof. The two key
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109 components built in this tree are loadagent (needed for all
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110 targets) and compalstage (for Compal phones only), which need
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111 to be installed on the user's host system in order for
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112 loadtools (see README.hosttools) to do their job.
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114 ffstools Tools that run on a Unix or GNU/Linux host; see README.hosttools
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115 loadtools for the details.
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116 miscutil
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117 rvinterf
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118
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119 toolchain Scripts and patches for building the gcc+binutils toolchain
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120 targeting ARM7, the CPU core of the Calypso GSM/GPRS baseband
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121 processor. You'll need to build and install this toolchain
143
afceeeb2cba1 Our nuc-fw is destined to become gsm-fw, so I went ahead and did the big hg mv
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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122 first before you can build gsm-fw or target-utils.
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c617a6adcb69 top level README: status update
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 387
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123
c617a6adcb69 top level README: status update
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 387
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124 If you like this project and would like to see it continue to fruition, please
c617a6adcb69 top level README: status update
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 387
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125 consider making a Bitcoin donation to the human family behind it:
c617a6adcb69 top level README: status update
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 387
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126
c617a6adcb69 top level README: status update
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 387
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127 https://blockchain.info/address/159Yx6JRJ4oMLPTYrh1jW7fQ5D5tPHdnoM