FreeCalypso > hg > fc-magnetite

annotate doc/Modem-configs @ 639:026c98f757a6

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tpudrv12.h & targets/gtm900.h: our current support is for MGC2GSMT version only As it turns out, there exist two different Huawei-made hw platforms both bearing the marketing name GTM900-B: one is MG01GSMT, the other is MGC2GSMT. The two are NOT fw-compatible: aside from flash chip differences which should be handled by autodetection, the two hw platforms are already known to have different RFFEs with different control signals, and there may be other differences not yet known. Our current gtm900 build target is for MGC2GSMT only; we do not yet have a specimen of MG01GSMT on hand, hence no support for that version will be possible until and unless someone provides one.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 30 Jan 2020 18:19:01 +0000
parents 39a226a06196
children
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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 those parts of GPF for
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23 which we have found matching sources are recompiled from those
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24 sources as well. The only components that are used as blobs
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25 are the G23M PS, CCD and ccddata, OSL and OSX (glue parts of
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26 GPF) and Nucleus. This config can be built for all targets
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27 except c11x.
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29 hybrid This configuration is a TCS2/TCS3 hybrid. Instead of using the
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30 TCS211 version of the G23M protocol stack which we got only as
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31 binary blobs, this config uses the G23M PS version from the
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32 TCS3.2/LoCosto source, backported to work with L1 and the fw
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33 foundation layers from TCS211. ACI also had to be replaced with
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34 the TCS3 version, and a special hybrid version of the cdginc
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35 headers had to be constructed, giving us blob-free CCD and
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36 ccddata. L1, the init code and the easy parts of GPF are also
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37 deblobbed as in l1reconst. Only Nucleus, OSL and OSX remain as
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38 blobs. Like l1reconst, this config can be built for all targets
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39 except c11x.
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40
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41 hybrid-osl This configuration is just like the regular hybrid config, but
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42 all of GPF is recompiled from source, including OSL and OSX glue
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43 layers. The source for these components has been reconstructed
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44 from disassembly - see below for the issues.
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46 All 4 of the above configurations have CSD, fax and GPRS enabled; this
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47 functionality can only be exercised on those hardware targets on which both
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48 Calypso UARTs are brought out, with the MODEM UART presenting a standard ASCII
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49 AT command interface including data functions, while the IrDA UART carries the
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50 RVTMUX interface for debug trace and other development functions. If you are
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51 interacting with your Calypso target modem or pseudo-modem solely through
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52 RVTMUX, without access to the ASCII AT command interface on the dedicated MODEM
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53 UART, then the data functions of the firmware are inaccessible and act as dead
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54 weight.
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55
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56 Having fully deblobbed all of L1, we now have the ability to build our hybrid
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57 firmware not only for the Standard Modem functionality with all data services
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58 enabled as above, but also in a stripped-down "voice pseudo-modem"
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59 configuration - see the Voice-pseudo-modem article.
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61 The deblobbing of L1 has been done in a very meticulous manner, ensuring that
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62 each individual reconstructed C module compiles into a strict functional
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63 equivalent of the original binary blob, sometimes even matching bit for bit -
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64 thus no regressions are expected with the classic->l1reconst transition, and no
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65 extensive testing is deemed necessary beyond the basic tests that have already
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66 been done. However, the transition from l1reconst to hybrid involves wholesale
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67 replacement of two major firmware components (G23M PS and ACI) and some
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68 important associated support pieces with entirely different versions from a
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69 different TI program, hence it can certainly benefit from more thorough testing.
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71 So far the most-deblobbed hybrid config looks very promising: voice, SMS and
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72 GPRS work perfectly in my (Mother Mychaela's) lab environment, and even CSD has
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73 finally been proven to work as well on 2018-06-21. CSD functionality has been
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74 extremely difficult to test because it has been very unreliable lately on the
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75 network side in my geographical location (T-Mobile USA), with CSD calls failing
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76 something like 99.9% of the time with a NO CARRIER response to the ATD command,
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77 using exactly the same modem hardware and firmware that worked flawlessly for
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78 CSD several years earlier, which makes it extremely difficult to test CSD calls
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79 with new firmware - but I finally succeeded in making a CSD call from an FCDEV3B
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80 running FC Magnetite hybrid on 2018-06-21, proving that the new hybrid fw is
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81 good for CSD functionality in addition to the better-tested voice, SMS and GPRS.
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83 When exercising our hybrid firmware in a production or semi-production setting,
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84 you should use the regular hybrid config for now, not hybrid-osl. GPF contains
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85 a sublayer called OSL (OS Adaptation Layer), a glue layer between GPF and
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86 Nucleus, and we got absolutely no source for it, only binary objects. The new
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87 hybrid-osl config uses a reconstructed source for OSL (reconstructed from
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88 disassembly), same as our earlier Citrine firmware, and it was introduced into
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89 Magnetite to serve as a stepping stone toward FC Selenite. There is a lot of
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90 code in OSL, the reconstruction from disassembly has been a significant work,
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91 and there are a few issues with the reconstructed source:
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93 * The reconstruction was really a process of writing new C code that matches
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94 the logic found in the disassembly of the original, and in some places this
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95 new C code was written with gcc in mind. Recompilation of this code with
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96 TI's proprietary TMS470 compiler may not be fully trustworthy.
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98 * An error handling function called os_SystemError() is currently stubbed out:
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99 reconstructing its original logic from disassembly is quite difficult, so it
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100 is deferred for now.
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102 * Given the complexity, some of the logic may have been reconstructed
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103 incorrectly, thus extensive testing will be needed.