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doc/Leonardo-target: Tango unused Calypso signals update
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 20 Jun 2020 05:08:39 +0000
parents 6edd9be81b94
children
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1 TI's primary development platform for TCS211 firmware was D-Sample - see our
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2 D-Sample article for explanation of our current limited support for that target
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3 in FC Magnetite - but they also had another platform called Leonardo. The
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4 primary difference is the RF section: D-Sample had Clara RF (the one for which
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5 we lack support), whereas Leonardo was TI's reference platform for Rita RF and
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6 for the complete Calypso+Iota+Rita chipset. Another major difference is that
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7 D-Sample was a single stable platform, whereas Leonardo was made in a
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8 bewildering assortment of different variants.
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9
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10 We (FreeCalypso core team) never succeeded in getting our hands on a real
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11 TI-made Leonardo board of any variant, but we do have a Leonardo build target
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12 in FC Magnetite for two reasons:
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13
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14 1) Adding this build target was trivial: our starting hw target for which we
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15 got our original starting-point fw was Openmoko's embedded GSM/GPRS modem,
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16 and that modem is a very close derivative of Leonardo. The only firmware-
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17 affecting diff between Leonardo and OM's modem is FIC/OM's reshuffling of
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18 TSPACT control lines for their triband RFFE; producing a build configuration
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19 with these TSPACT control signals put back into their original Leonardo
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20 arrangement became trivial once our reconstruction of tpudrv12.c from
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21 disassembly of tpudrv12.obj reached production quality.
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22
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23 2) At the end of 2019 we discovered a certain modem module which we call Tango,
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24 and this Tango module is essentially a mass-produced version of TI's Leonardo
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25 core. Tango is just the core of Leonardo, without any peripherals, thus a
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26 proper fw build target for any given Tango-based platform is going to be a
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27 little different from Leonardo in terms of GPIO and other peripheral config
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28 (see our tangomdm target), but initially we ran our Magnetite-Leonardo fw
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29 (built for target leonardo) on our Caramel board - it runs just fine except
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30 for GPIO config being slightly wrong, leaving a few GPIO lines floating.
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31
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32 Supported Leonardo variants
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33 ===========================
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34
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35 RF bands: there were several Leonardo variants with full quadband RF using Epcos
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36 M034F FEM, and there were several more variants with artifically restricted RF,
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37 using a dual-band/single-region FEM and supporting only the two EU bands. The
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38 two versions should be firmware-compatible according to our available schematics
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39 (the same TSPACT signals are used for Tx control), thus our Magnetite-Leonardo
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40 fw should run on any Leonardo variant that matches any of our known schematic
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41 versions at least in the principal aspects.
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42
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43 Flash memory: our Magnetite-Leonardo fw supports the following flash chips for
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44 FFS:
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45
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46 4 MiB: Fujitsu MBM29DL320FB or MBM29DL320FT
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47 8 MiB: Am29DL640G or its Fujitsu equivalent, or any MCP containing this flash
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48 16 MiB: Spansion PL129J or its AMD predecessor, second bank on nCS2
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49
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50 If anyone finds a Leonardo variant with some other flash, it may not be
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51 supported out of the box - but our included FFS configs for the Leonardo target
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52 come directly from TI's original TCS211 version (it is highly unlikely that OM
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53 changed anything other than adding their Samsung flash), thus we support
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54 everything that TI's own TCS211 supported out of the box.
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55
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56 Memory size limits
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57 ==================
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58
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59 The linker script template we use for target leonardo has memory region size
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60 limits set as follows: 8 MiB of flash, 2 MiB of XRAM and 512 KiB of IRAM. If
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61 you are working with a Leonardo or Leonardo-compatible board that has smaller
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62 flash or XRAM, or has a Calypso Lite chip with only 256 KiB of IRAM, then you
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63 have to manually ensure that you stay within your actual memory limits, as you
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64 won't get a failing link unless you exceed the larger linker script limits.
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65
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66 If you are building a modem-only fw configuration (l1reconst or hybrid), it
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67 will fit into under 3 MiB of flash (fitting into a 4 MiB flash chip together
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68 with FFS), 512 KiB of XRAM and 256 KiB of IRAM, so you are safe unless you are
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69 going to add a lot of your own code or data space. But if you are going to
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70 build a UI-enabled fw config (2092 or hybrid-ui), then you will need at least
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71 an 8 MiB flash chip (won't fit into a 4 MiB chip together with FFS) and at least
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72 1 MiB of XRAM. So far all of our configs fit into 256 KiB of IRAM.
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73
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74 Different Calypso chip versions
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75 ===============================
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76
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77 If you specify the build target as just leonardo, your fw will be configured
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78 and built for the leonardo-dsp36 target. If you actually need leonardo-c05b or
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79 leonardo-dsp34 because your board has an older Calypso chip version on it, then
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80 you will need to specify the build target as just stated - see the
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81 Calypso-version-override article.
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82
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83 Calypso GPIO 2 configuration
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84 ============================
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85
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86 On TI's C-Sample and D-Sample boards Calypso GPIO 2 is wired to serve as the DCD
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87 output for the MODEM UART (Calypso device as DCE), and our FC Magnetite firmware
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88 drives it as such on D-Sample, FCDEV3B and GTM900 targets. But this same config
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89 does NOT apply to Leonardo: on the latter boards GPIO 2 is wired in a way that
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90 requires it to be configured as an input to Calypso, not an output.
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91
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92 TI's TCS211 firmware had this Leonardo GPIO 2 situation handled in a very
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93 bizarre manner: the main GPIO init code in AI_InitIOConfig() in armio.c made no
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94 differentiation between D-Sample and Leonardo and configured GPIO 2 as an
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95 output, then the init code in uartfax.c did the same setup again, but at the
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96 end of the Init_Serial_Flows() function in the init module (which we only got
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97 as init.obj, with init.c censored out) they inserted a bit of code that switches
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98 GPIO 2 to be an input. What a mess.
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99
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100 Our handling of this GPIO 2 situation in FC Magnetite is much cleaner: we have
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101 put an #ifndef CONFIG_TARGET_LEONARDO around the AI_ConfigBitAsOutput(2) call
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102 in AI_InitIOConfig() so this GPIO line never becomes an output in the first
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103 place, and our targets/leonardo.h configuration header defines
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104 UARTFAX_CLASSIC_DTR_DCD to 0 on this target, disabling that code in the
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105 uartfax.c driver.
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106
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107 This peculiar GPIO 2 situation applies only to real Leonardo boards, not to
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108 Tango modems: a custom design using a Tango module can use this GPIO line for
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109 anything, but on Caramel boards it drives RS-232 DCD like on D-Sample and thus
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110 should be configured as a Calypso output.
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111
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112 Other GPIO and multifunction pins
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113 =================================
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114
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115 Our Magnetite-Leonardo fw is unchanged from TI's TCS211 original in that GPIO0,
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116 TSPDI/GPIO4 and DSR_MODEM/LPG pins are left configured as inputs, even though
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117 the schematics we've got show GPIO0 as an output and the other two pins as
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118 unconnected, in which case they should also be configured as outputs in order
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119 to not float. We are leaving this aspect unchanged currently because this
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120 Magnetite-Leonardo fw build target is really just a reference for practically
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121 non-existent hw, and given the unknown of what other Leonardo variants may have
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122 existed once beyond our known schematics, we would rather leave a few floating
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123 inputs than risk causing a driver conflict on some unknown board.
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124
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125 In the case of Tango these 3 just-mentioned Calypso signals (as well as
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126 BCLKX/GPIO6) have been confirmed to be unconnected at their Calypso ball pads
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127 (not brought out externally, not used internally for anything, not tied or
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128 pulled to either GND or V-IO), thus we configure them as dummy outputs,
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129 eliminating floating inputs.