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annotate doc/Handset-configs @ 373:9399a83cb394

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first round of documentation updates for 2018
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 11 Jan 2018 22:44:09 +0000
parents 5b1358df7e3c
children
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b05dba024f95 doc/Handset-configs and doc/Modem-configs written
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1 Work toward end user libre phone firmware
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2 =========================================
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3
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4 Phone handset firmware, i.e., fw that makes a phone device work as an untethered
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5 phone and not just a serial-cable-controlled pseudo-modem, requires a few
b05dba024f95 doc/Handset-configs and doc/Modem-configs written
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6 additional layers of functionality beyond AT-command-controlled modem fw:
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7
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8 * The hardware-specific LCD driver, called R2D in TI's TCS211 program;
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9 * The actual phone UI implementation, which the cellular industry calls by the
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10 sexist term "MMI" - TI's implementation consists of two components called BMI
b05dba024f95 doc/Handset-configs and doc/Modem-configs written
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11 and MFW;
b05dba024f95 doc/Handset-configs and doc/Modem-configs written
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12 * Battery management (monitoring and charging);
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13 * Fairly complex on/off logic to handle all possible combinations of turn-on,
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14 turn-off, charging while "on", charging while "off", charging completed or
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15 failed but charging power source not unplugged yet.
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16
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17 The code we got from TI with the TCS211 delivery by Sotovik includes only a
b05dba024f95 doc/Handset-configs and doc/Modem-configs written
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18 very rudimentary implementation of the above functions that basically amounts
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19 to nothing more than a proof of concept, and is absolutely not ready for driving
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20 a real end user phone: the UI code contains crashing and other killer bugs, the
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21 battery management code doesn't work (fails to even monitor the battery voltage
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22 in the discharging state, and I haven't even got to trying to charge), and the
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23 on/off logic is broken in several ways.
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24
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25 If we desire a libre phone for our pockets and purses (I do desire one for my
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26 purse), we will have to bite the bullet and do the necessary work to transform
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27 the UI and associated handset code from its current sorry state into something
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28 usable, and I have started laying a little bit of the necessary foundation for
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29 doing this work in FC Magnetite.
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30
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31 There are currently two Magnetite configurations (in the ./configure.sh sense)
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32 that include the UI layers: 2092 and 2092-pwr. 2092 is TI's bizarre "product"
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33 number for the configuration that is just like the one we got from Sotovik
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34 (called pdt_2091), but with BMI enabled. The difference between the plain 2092
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35 config and 2092-pwr is that the latter includes TI's battery management code in
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36 the form of the old RiViera Software Entity (SWE) called PWR. (I tested the
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37 latter on the C139 and found it to be broken.)
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38
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39 If you request the 2092 configuration for a target other than c139, i.e., for
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40 fcdev3b, gtamodem or pirelli, you will get a successful build (to be pedantic,
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41 if you pick gtamodem, you'll get a link failure unless you tweak the linker
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42 script, but it's a minor nit), but if you then run that fw image on the
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43 hardware, it won't do anything good: it will try to display TI's D-Sample UI
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44 (176x220 pixels, color) on the D-Sample LCD attached to Calypso chip select
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45 nCS3, but of course neither Openmoko's modem nor the Pirelli has a D-Sample LCD
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46 on that chip select, thus the LCD output would fall into the aether. (It would
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47 be even worse in the case of the Pirelli which has the 2nd flash bank on nCS3,
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48 thus the D-Sample LCD writes could clash with the FFS code operating on that
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49 flash - so don't do it.) However, because BMI is enabled, the fw will still
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50 automatically bring up the GSM radio and register to the default network
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51 immediately upon boot like a typical UI-enabled phone does, even though the
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52 associated LCD output will be invisible. Needless to say, this configuration
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53 is not something I would ever advise actually running.
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54
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55 However, if you build the 2092 config for the c139 target, the Magnetite build
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56 system will enable the same hack which was originally implemented in the
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57 tcs211-c139 side project in late 2015. Prior to the D-Sample with its fancy
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58 176x220 pix color LCD, TI's previous development platforms (C-Sample and
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59 earlier) had 84x48 pix black&white (1 bit per pixel) LCDs, and this old C-Sample
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60 LCD support is still there in TCS211, albeit in a bitrotten form that wouldn't
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61 even compile without a lot of fixing. In our late-2015 tcs211-c139 side project
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62 we had resurrected this C-Sample UI configuration, and this work has now been
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63 integrated into Magnetite. When you build Magnetite in the 2092 configuration
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64 for the c139, you will get our C139 LCD driver that pretends to be C-Sample to
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65 the upper layers, and you will get TI's old 84x48 pix B&W UI displayed on the
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66 phone's 96x64 pixel color LCD. IOW, only 84x48 out of the available 96x64
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67 pixels are used, and only 2 out of the available 65536 colors. Yes, pretty
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68 pathetic, I know.
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69
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70 My (Mychaela's) plan going forward is to build our own more proper hardware
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71 before digging any deeper into TI's broken UI code. I am not happy at all
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72 about having had to disable TI's D-Sample UI (the 176x220 pix color one) and
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73 resurrect the ancient pathetic C-Sample one instead, and given the long list of
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74 show-stopping bugs this UI code currently exhibits, I can never be sure which
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75 of these bugs were already there in the D-Sample config this code was made for,
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76 vs. which of these bugs could be a result of re-enabling the very bitrotten
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77 C-Sample UI config - remember, it wouldn't even compile at first.
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78
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79 As much as I would love to have a libre phone in my purse, my desire to see
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80 TI's UI code running in its native 176x220 pix color form is even greater, hence
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81 I have decided that I shall abstain from doing any further UI work targeting
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82 the C139 or the Pirelli until *after* we have built my desired HSMBP: Handset
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83 Motherboard Prototype, a Calypso board with a 176x220 pix color LCD just like
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84 on TI's D-Sample.
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85
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86 However, if anyone else in the community has a different view and sees the
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87 making of a libre phone based on Mot C1xx or Pirelli hardware as more important
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88 than building our own hw, please feel free to take a stab at the code yourself:
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89 the whole point of FLOSS projects is that anyone can do what s/he wants with
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90 the code and the project without being beholden to the leader's views. At least
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91 some of the necessary foundation has already been laid for you.
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92
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93 Deblobbing status
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94 =================
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95
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96 The current 2092 and 2092-pwr configs are based on the l1reconst modem config
313
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97 (see the Modem-configs write-up), i.e., L1 and the init code in main.lib are
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98 fully rebuilt from source, but the versions of G23M PS and ACI are the original
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99 TCS211 ones, thus the G23M PS component is all blobs. In order to build a
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100 G23M-deblobbed UI-enabled config, we would need to build the UI layers (MFW and
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101 BMI) on top of the new TCS3.2 version of ACI used in the deblobbed hybrid
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102 config, and no such feat has been attempted yet. I personally plan on tackling
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103 this direction only after we have built my desired D-Sample-like HSMBP and
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104 brought up the original TCS211 UI in its original form, but once again, anyone
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105 else whose priorities are different from mine should feel free to delve into
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106 the code themselves.