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doc/Modem-configs: hybrid-gpf documented
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 25 Jun 2018 05:34:57 +0000
parents c433cca731a3
children 39a226a06196
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1 Modem configurations
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2 ====================
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3
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4 If you would like to build our Magnetite firmware for the Standard Modem
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5 functionality (voice, SMS, CSD, fax and GPRS services enabled, control via AT
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6 commands, no UI, two UARTs are expected to be available for the AT command
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7 interface and for the RVTMUX binary packet interface), you have 4 specific
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8 configurations to choose from, differing in the level of deblobbing:
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10 classic This configuration replicates classic TCS211, just like
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11 leo2moko from 2013. Almost all of the original binary blob
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12 libraries are used; the only components that are recompiled
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13 from source are those which we got in source form with our copy
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14 of TCS211 from Sotovik. This config can only be built for the
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15 fcdev3b and gtamodem targets, not any others.
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16
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17 l1reconst In this configuration the Layer1 component of the firmware
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18 (which came as a blob in our copy of TCS211) is recompiled from
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19 reconstructed source, and the same is done for the system
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20 initialization code in main.lib. The entire chipsetsw division
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21 of the firmware (now in src/cs) is thus recompiled from source,
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22 either original or reconstructed, and the only components that
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23 are used as blobs are the G23M PS, GPF and Nucleus. This
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24 config can be built for all targets except c11x.
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26 hybrid This configuration is a TCS2/TCS3 hybrid. Instead of using the
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27 TCS211 version of the G23M protocol stack which we got only as
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28 binary blobs, this config uses the G23M PS version from the
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29 TCS3.2/LoCosto source, backported to work with L1 and the fw
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30 foundation layers from TCS211. ACI also had to be replaced with
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31 the TCS3 version, and a special hybrid version of the cdginc
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32 headers had to be constructed. L1 and the init code are also
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33 deblobbed as in l1reconst. Like l1reconst, this config can be
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34 built for all targets except c11x.
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35
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36 hybrid-gpf This configuration is just like the regular hybrid config, but
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37 GPF libraries are recompiled from source along with the rest of
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38 the fw. For some parts of GPF (OSL and OSX components) no
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39 original source could be found, thus the source we are using
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40 has been reconstructed from disassembly.
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41
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42 All 4 of the above configurations have CSD, fax and GPRS enabled; this
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43 functionality can only be exercised on those hardware targets on which both
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44 Calypso UARTs are brought out, with the MODEM UART presenting a standard ASCII
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45 AT command interface including data functions, while the IrDA UART carries the
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46 RVTMUX interface for debug trace and other development functions. If you are
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47 interacting with your Calypso target modem or pseudo-modem solely through
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48 RVTMUX, without access to the ASCII AT command interface on the dedicated MODEM
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49 UART, then the data functions of the firmware are inaccessible and act as dead
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50 weight.
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51
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52 Having fully deblobbed all of L1, we now have the ability to build our hybrid
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53 firmware not only for the Standard Modem functionality with all data services
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54 enabled as above, but also in a stripped-down "voice pseudo-modem"
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55 configuration - see the Voice-pseudo-modem article.
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56
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57 The deblobbing of L1 has been done in a very meticulous manner, ensuring that
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58 each individual reconstructed C module compiles into a strict functional
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59 equivalent of the original binary blob, sometimes even matching bit for bit -
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60 thus no regressions are expected with the classic->l1reconst transition, and no
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61 extensive testing is deemed necessary beyond the basic tests that have already
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62 been done. However, the transition from l1reconst to hybrid involves wholesale
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63 replacement of two major firmware components (G23M PS and ACI) and some
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64 important associated support pieces with entirely different versions from a
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65 different TI program, hence it can certainly benefit from more thorough testing.
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66
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67 So far the most-deblobbed hybrid config looks very promising: voice, SMS and
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68 GPRS work perfectly in my (Mother Mychaela's) lab environment, and even CSD has
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69 finally been proven to work as well on 2018-06-21. CSD functionality has been
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70 extremely difficult to test because it has been very unreliable lately on the
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71 network side in my geographical location (T-Mobile USA), with CSD calls failing
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72 something like 99.9% of the time with a NO CARRIER response to the ATD command,
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73 using exactly the same modem hardware and firmware that worked flawlessly for
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74 CSD several years earlier, which makes it extremely difficult to test CSD calls
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75 with new firmware - but I finally succeeded in making a CSD call from an FCDEV3B
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76 running FC Magnetite hybrid on 2018-06-21, proving that the new hybrid fw is
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77 good for CSD functionality in addition to the better-tested voice, SMS and GPRS.
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78
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79 When exercising our hybrid firmware in a production or semi-production setting,
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80 you should use the regular hybrid config for now, not hybrid-gpf. GPF contains
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81 a sublayer called OSL (OS Adaptation Layer), a glue layer between GPF and
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82 Nucleus, and we got absolutely no source for it, only binary objects. The new
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83 hybrid-gpf config uses a reconstructed source for OSL (reconstructed from
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84 disassembly), same as our earlier Citrine firmware, and it is intended to serve
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85 as the basis for the planned new FreeCalypso Selenite fw project. There is a
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86 lot of code in OSL, the reconstruction from disassembly has been a significant
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87 work, and there are a few issues with the reconstructed source:
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88
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89 * The reconstruction was really a process of writing new C code that matches
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90 the logic found in the disassembly of the original, and in some places this
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91 new C code was written with gcc in mind. Recompilation of this code with
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92 TI's proprietary TMS470 compiler may not be fully trustworthy.
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93
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94 * An error handling function called os_SystemError() is currently stubbed out:
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95 reconstructing its original logic from disassembly is quite difficult, so it
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96 being deferred for now.
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97
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98 * Given the complexity, some of the logic may have been reconstructed
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99 incorrectly, thus extensive testing will be needed.