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FC-handset-spec: document our plan of using NCR18650B
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 21 Sep 2021 02:29:40 +0000
parents 7aed57fc1928
children
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1 The very first FreeCalypso hardware product named FCDEV3B was conceived in 2015
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2 and physically produced in the first version in 2017, with the final all-bugs-
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3 fixed version produced in early 2019. FCDEV3B was conceived to fulfill an
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4 internal project need: to replace no longer available and quite inconvenient
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5 Openmoko hardware, and to provide a platform for empirically learning those
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6 parts of TI's chipset+fw solution which were previously elusive. The '3B' at
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7 the end of FCDEV3B board name stands for triband, which was a deviation from
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8 the Mother's original desires: ever since I first found TI's Leonardo schematics
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9 back in 2011, I had always wanted to make all of my FreeCalypso hw designs fully
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10 quadband, following TI's original Leonardo+ quadband reference design. But in
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11 2015 we lacked the necessary know-how to recreate TI's quadband Leonardo from
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12 schematics alone, whereas for Openmoko's triband version we had not only
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13 schematics, but also the complete PCB layout - thus we took the only course of
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14 action that was viable at that time, and produced our FCDEV3B based on
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15 Openmoko's version of the Calypso modem.
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17 At the same time when our first FCDEV3B boards were being produced and debugged,
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18 there was talk about producing a derivative version that would be packaged as a
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19 component to be integrated into other people's systems and projects, as opposed
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20 to a standalone development board for use on a lab bench. I also did not feel
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21 like staying triband forever, and the thought of a future quadband successor was
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22 on my mind even as FCDEV3B was being designed. Thus there was an intent to have
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23 a family of FreeCalypso modem products, eventually evolving from triband to
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24 quadband, and being made in different form factors for different use cases.
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25 But none of these ideas ever came to fruition because no one ever funded any of
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26 them.
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28 The situation changed drastically with the discovery of already existing Tango
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29 modem modules, discovery that was made in December of 2019 and fully accepted
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30 as the new reality over the course of 2020. The newly discovered Tango modem
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31 module is essentially a mass-produced version of TI's Leonardo+ quadband
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32 reference design, and it is a very good module, even more capable than what we
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33 would have produced if someone had funded our ideas in the 2017 to 2019 period.
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35 In this new Tango reality it makes absolutely no business sense to produce any
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36 new FreeCalypso modem modules, so instead we decided on a different and quite
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37 novel course of action: we are officially adopting this already existing Tango
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38 module into our FreeCalypso family by way of rebranding - we are going to resell
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39 these modules as FreeCalypso Tango, flashed with our FreeCalypso firmware and
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40 differentiated from non-FC-sourced modules with a sticker bearing our trademark.
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41 Our rebranded and reflashed FC Tango modules are expected to become available
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42 in December of 2020.
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44 On the FreeCalypso firmware side, our earlier idea of a single fcmodem target
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45 that would cover multiple physical hw products in the FC modem family has been
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46 withdrawn: our existing FCDEV3B hw is covered by firmware build target fcdev3b,
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47 whereas Tango modems are covered by fw build target tangomdm. Openmoko modems
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48 are covered by fw build target gtamodem. None of these 3 fw build targets are
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49 interchangeable: each build will only work on its one respective hw target.
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51 In the unlikely event that our recently discovered Tango modules prove
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52 insufficient and someone commissions us to design and build a new Calypso modem
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53 starting from just chips, it will probably make the most sense to design that
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54 new modem in such a way that it would share the same fw build with Tango, rather
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55 than with FCDEV3B: Tango is much more versatile in terms of how the multitude
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56 of Calypso GPIO and multifunction pins may be configured.
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58 FreeCalypso handset idea
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59 ========================
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61 I (Mother Mychaela) still desire my own FreeCalypso phone handset that would
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62 replace my current Pirelli DP-L10 - but it is currently unknown whether or not
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63 my personal life circumstances will remain such that this project desire will
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64 remain active, or if changes in my personal life circumstances (such as loss of
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65 GSM service in the area where I live combined with no ability to relocate to a
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66 more GSM-friendly country) will invalidate this project desire.
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68 In the now-seemingly-unlikely event that I live long enough with active GSM
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69 service to where I would get around to doing this FC handset project, it is my
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70 desire to build that handset board starting from just chips, rather than based
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71 on Tango. A handset is not a modem, thus handsets and modems generally do not
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72 share the same firmware build targets - thus if my dream FC handset board ever
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73 becomes a reality, it will have its own dedicated fw build target, not shared
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74 with any other hw. I definitely wish to use the same quadband RFFE as Leonardo
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75 and Tango, and my currently envisioned choice of flash chip is S71PL064J.
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77 CONFIG_TARGET_FCFAM C preprocessor symbol
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78 =========================================
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80 As of 2020-09 this C preprocessor symbol (currently defined only for build
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81 target fcdev3b) has only two effects:
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83 1) It changes the src/cs/drivers/drv_app/ffs/board/dev.c table of supported
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84 flash chips and FFS configurations, as well as a few other FFS config bits
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85 to support the large 16 MiB flash config used on FCDEV3B. Targets like Tango
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86 with S71PL064J or S71PL032J flash will continue to work equally well whether
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87 or not CONFIG_TARGET_FCFAM is defined because these two flash chips are
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88 listed in both versions of the table with the same FFS config, but 16 MiB
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89 flash chips S71PL129J and S71PL129N are supported only with
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90 CONFIG_TARGET_FCFAM and cannot be otherwise, as their 2nd flash chip select
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91 wiring is FC-specific. Yet on the contrary, Samsung K5A32xxCTM with
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92 Openmoko's FFS config (also used by Huawei) is NOT compatible with
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93 CONFIG_TARGET_FCFAM.
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94
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95 2) It changes the default compiled-in AFC Psi parameters in L1 from TI's
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96 Leonardo values to a different set of numbers that match Openmoko/FCDEV3B
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97 VCXO. But these compiled-in values are only fallbacks, and are generally
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98 expected to be overridden by factory calibration written into FFS.
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99
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100 -h fcfam target for fc-loadtool
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101 ===============================
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102
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103 The -h fcfam target must be used with FCDEV3B, no other loadtool configs will
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104 work: FCDEV3B has a 16 MiB flash chip that is only supported with -h fcfam.
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105 Either -h fcfam or -h gen8 will work equally well on FC Tango modems (S71PL064J
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106 flash chip), thus you can use whichever config you feel is more philosophically
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107 correct.