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annotate doc/Modem-configs @ 375:e80e43185ca1

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doc/Modem-configs update: we now have both Standard Modem and VPM functionality choices
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 12 Jan 2018 07:22:16 +0000
parents e60d7a32ae2a
children 117bf0fb1e78
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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 3 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 for c139 or pirelli.
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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.
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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, and it is currently the most deblobbed
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35 (closest to full source) Magnetite config: the only remaining
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36 blobs are GPF and Nucleus.
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38 All 3 of the above configurations have CSD, fax and GPRS enabled; this
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39 functionality can only be exercised on those hardware targets on which both
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40 Calypso UARTs are brought out, with the MODEM UART presenting a standard ASCII
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41 AT command interface including data functions, while the IrDA UART carries the
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42 RVTMUX interface for debug trace and other development functions. If you are
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43 interacting with your Calypso target modem or pseudo-modem solely through
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44 RVTMUX, without access to the ASCII AT command interface on the dedicated MODEM
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45 UART, then the data functions of the firmware are inaccessible and act as dead
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46 weight.
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47
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48 Having fully deblobbed all of L1, we now have the ability to build our hybrid
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49 firmware not only for the Standard Modem functionality with all data services
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50 enabled as above, but also in a stripped-down "voice pseudo-modem"
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51 configuration - see the Voice-pseudo-modem article.
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53 The deblobbing of L1 has been done in a very meticulous manner, ensuring that
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54 each individual reconstructed C module compiles into a strict functional
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55 equivalent of the original binary blob, sometimes even matching bit for bit -
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56 thus no regressions are expected with the classic->l1reconst transition, and no
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57 extensive testing is deemed necessary beyond the basic tests that have already
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58 been done. However, the transition from l1reconst to hybrid involves wholesale
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59 replacement of two major firmware components (G23M PS and ACI) and some
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60 important associated support pieces with entirely different versions from a
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61 different TI program, hence extensive testing and debugging will be needed.
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63 So far the most-deblobbed hybrid config looks very promising: after fixing the
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64 hideous bug resulting from the addition of A5/3 support in TCS3.2 (hardware
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65 feature available on LoCosto but not on Calypso), voice calls work perfectly,
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66 both with the legacy codecs and with AMR! (The same A5/3 bugfix has also been
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67 applied to our Citrine fw, hence the latter now has working voice calls too.)
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68 However, it is almost certain that there are a ton of minor bugs which need to
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69 be shaken out, hence this firmware build config should be treated as
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70 experimental for the time being, not production.