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doc/Modem-configs: L1 deblobbing status update
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 Mar 2017 04:00:10 +0000
parents b05dba024f95
children 1811c418461b
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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 in the AT-command-controlled
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5 modem configuration (not the C-Sample UI demo on the Mot C139), you have 3
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6 specific configurations to choose from, differing in the level of deblobbing:
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7
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8 classic This configuration replicates classic TCS211, just like
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9 leo2moko from 2013. Almost all of the original binary blob
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10 libraries are used; the only components that are recompiled
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11 from source are those which we got in source form with our copy
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12 of TCS211 from Sotovik. This config can only be built for the
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13 fcdev3b and gtamodem targets, not for c139 or pirelli.
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14
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15 l1reconst In this configuration most of L1 (GSM Layer 1) is recompiled
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16 from reconstructed source, although this deblobbing of L1 is
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17 not 100% complete yet: for the GPRS-specific L1 modules the
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18 original binary object blobs are still used. Some housekeeping
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19 pieces are also recompiled from source that had to be
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20 reconstructed. This config can be built for all targets.
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22 hybrid This configuration is a TCS2/TCS3 hybrid. Instead of using the
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23 TCS211 version of the G23M protocol stack which we got only as
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24 binary blobs, this config uses the G23M PS version from the
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25 TCS3.2/LoCosto source, backported to work with L1 and the fw
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26 foundation layers from TCS211. ACI also had to be replaced with
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27 the TCS3 version, and a special hybrid version of the cdginc
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28 headers had to be constructed. L1 is also deblobbed to the
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29 same extent as in l1reconst. Like l1reconst, this config can
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30 be built for all targets, and it is currently the most deblobbed
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31 (closest to full source) Magnetite config.
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32
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33 All 3 of the above configurations have CSD, fax and GPRS enabled, i.e., include
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34 functionality that will only become exercisable when we build our FCDEV3B and
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35 is dead weight until then, while we limp along with the currently available
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36 hardware. Having deblobbed all of L1 except GPRS-specific modules, we are now
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37 in a position where we can build a hybrid config with GPRS excluded, optionally
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38 including or excluding FAX_AND_DATA, but I (Mychaela) would like to thoroughly
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39 exercise the hybrid config in its current everything-enabled state before making
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40 further changes to it.
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42 The deblobbing of L1 has been done in a very meticulous manner, ensuring that
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43 each individual reconstructed C module compiles into a strict functional
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44 equivalent of the original binary blob, sometimes even matching bit for bit -
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45 thus no regressions are expected with the classic->l1reconst transition, and no
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46 extensive testing is deemed necessary beyond the basic tests that have already
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47 been done. However, the transition from l1reconst to hybrid involves wholesale
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48 replacement of two major firmware components (G23M PS and ACI) and some
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49 important associated support pieces with entirely different versions from a
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50 different TI program, hence extensive testing and debugging will be needed.
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51
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52 So far the most-deblobbed hybrid config looks very promising: after fixing the
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53 hideous bug resulting from the addition of A5/3 support in TCS3.2 (hardware
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54 feature available on LoCosto but not on Calypso), voice calls work perfectly,
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55 both with the legacy codecs and with AMR! (The same A5/3 bugfix has also been
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56 applied to our Citrine fw, hence the latter now has working voice calls too.)
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57 However, it is almost certain that there are a ton of minor bugs which need to
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58 be shaken out, hence this firmware build config should be treated as
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59 experimental for the time being, not production. My plan is to work on shaking
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60 out the minor bugs and bringing this hybrid fw to production quality after we
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61 build the proper hardware platform for it, i.e., the FCDEV3B.