FreeCalypso > hg > fc-magnetite
annotate doc/D-Sample @ 631:597869e59805
config: introduced new CONFIG_MCSI_MODEM preprocessor symbol
All MCSI functionality was previously conditionalized on CONFIG_TARGET_FCMODEM
(even earlier it was CONFIG_TARGET_FCDEV3B), but having a dedicated
preprocessor symbol for this purpose (defined in targets/*.h as appropriate)
makes it much easier to support different modem targets with MCSI enabled.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 04 Jan 2020 19:07:02 +0000 |
parents | 0d66718e5f33 |
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1 Back In The Day TI had an official and well-supported platform for Calypso |
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2 software development; this platform was called D-Sample. It consisted of a |
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3 development board with the Calypso+Iota chipset on it (as well as a GSM RF |
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4 section based on their older Clara RF transceiver chip) plus an attached test |
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5 handset. Here are some pictures: |
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6 |
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7 https://www.freecalypso.org/members/falcon/pictures/D-Sample/ |
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8 |
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9 I (Mychaela) have managed to obtain one of these historical D-Sample kits (the |
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10 one pictured) back in 2015. Given that this D-Sample board was the original |
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11 and most native hw target for the TCS211 firmware program, and given that our |
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12 FreeCalypso Magnetite firmware project is essentially a resurrection and |
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13 continuation of that TCS211 fw program, I naturally have a strong desire to |
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14 have our firmware run on this board in its full glory like it once ran in the |
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15 offices or cubicles of TI's own software engineers who worked on various parts |
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16 of TCS211 fw for the Calypso. |
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17 |
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18 The current state of support is that we have everything other than the GSM radio |
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19 working. We are currently unable to bring up the radio tract on the D-Sample |
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20 board with our own Magnetite fw because of Clara RF: we only got a stripped |
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21 semi-src version of TCS211 in which the *.c files for L1 were censored out and |
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22 only *.obj blobs were supplied instead; the latter blobs target Rita RF and not |
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23 Clara. We have now successfully reconstructed the lost C sources for the RF- |
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24 independent and Rita-specific L1 modules, and we have l1_rf10.c for Clara RF |
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25 from the MV100 source fragments, but we are still missing the tpudrv10.c module |
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26 which is also required for Clara RF. The 20020917 fw image that came flashed |
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27 with this board does operate the RF hardware (tested and proven good with our |
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28 CMU200 instrument), and we have tried extracting the elusive tpudrv10 bits from |
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29 this original 20020917 fw. Our current tpudrv10.c driver is an attempt to |
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30 replicate what the original firmware appears to do, i.e., a translation of the |
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31 mystery logic from disassembly to C. But unfortunately it doesn't work, i.e., |
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32 when we flash our Magnetite fw into the board, we get non-working RF: in the Rx |
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33 direction the Calypso DSP fails to receive the signal put out by the CMU200, |
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34 and in the Tx direction the CMU200 detects no signal put out by the MS. |
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35 |
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36 Despite having no working radio, everything else works: we can flash our own |
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37 Magnetite fw images into the board with our fc-loadtool (fc-host-tools-r8 or |
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38 later; earlier versions did not support the 28F640W30B flash chip correctly), |
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39 the SIM interface works, the audio subsystem driven by the Calypso DSP driven |
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40 by our reconstructed TCS211 L1 works (can make beeps through the loudspeaker in |
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41 the handset part of the kit), the handset keypad works, and when we run a |
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42 firmware image built with the UI layers enabled, the 176x220 pixel color UI |
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43 shows up on the big LCD. Because the SIM interface works, one can play with |
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44 this UI a fair bit despite having no working GSM radio: the UI behaves the same |
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45 way as any regular phone would in the absence of coverage, so one can step |
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46 through the menus, read SIM phonebook entries and stored messages. |
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47 |
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48 Apparent hardware defect in our D-Sample LCD |
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49 ============================================ |
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50 |
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51 The one specific D-Sample board we have managed to score (might be the last one |
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52 left in the world, who knows) appears to be an early board: it is PCB rev 3, |
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53 but it has an early C05 version of the Calypso chip (F741979B), and it was made |
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54 some time in 2002. It came flashed with a firmware image built on 20020917, |
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55 and this original image it came with did not light up the LCD at all - it only |
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56 responded to AT commands. (Examination of that fw image suggests that it has |
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57 SMI instead of BMI+MFW, but I am not familiar with SMI at all - all I can tell |
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58 is that it behaves functionally as if it were an ACI build.) Thus the LCD part |
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59 of this D-Sample hardware only got exercised for the first time when I ran our |
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60 own Magnetite fw on it, and it exhibits some strange behaviour which I can only |
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61 attribute to a hardware problem. |
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62 |
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63 The symptom is that the picture on the LCD sometimes appears garbled, and |
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64 whether or not this LCD garbling happens (and if it does happen, how severely) |
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65 appears to depend on the picture content. Furthermore, the dependency is not |
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66 only on the picture content, but seemingly also on some law of chance, as the |
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67 same picture can get garbled more or less severely at different times. Closer |
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68 examination of exactly how the picture is garbled reveals that the misbehaviour |
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69 appears to be some kind of double latching of write data inside the LCD module. |
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70 |
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71 The R2D driver maintains a software framebuffer in the r2d_lcd_memory_words[] |
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72 array, and the r2d_refresh() function transfers the picture in this software |
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73 FB to the hardware FB inside the LCD module by sequentially writing 176*220 |
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74 16-bit words into a fixed ARM7 memory address in the nCS3 range, causing a |
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75 write cycle to be issued to the LCD module for each pixel. When a garbled |
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76 picture appears on the physical LCD, the picture maintained by the software in |
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77 the r2d_lcd_memory_words[] array is correct (not garbled) as revealed by |
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78 reading that array memory out via ETM memory read commands (see the tools in |
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79 the freecalypso-ui-dev repository), and the picture on the physical LCD is |
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80 garbled in such a way that it appears that at some point when the firmware sent |
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81 a single pixel to it, the LCD module erroneously registered a double write, |
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82 incrementing the internal FB RAM pointer by two pixels instead of one, with all |
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83 subsequent pixels shifted accordingly. The picture can be garbled more or less |
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84 severely depending on how many pixels in the picture trigger this apparent |
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85 double write effect. |
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86 |
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87 The end result is that even though we have a real TI-made D-Sample hardware kit, |
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88 its usefulness to us for FreeCalypso UI development is rather limited because |
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89 of both the lack of tpudrv10.c code resulting in no working GSM radio and the |
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90 apparent hardware problem with the LCD module in the handset part of the kit. |
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91 |
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92 The Mother's plan is to design and build our own UI development board to take |
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93 the place of TI's D-Sample, combining the good version of the Calypso+Iota+Rita |
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94 chipset for which we have good fw support with a 176x220 pix color LCD of our |
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95 own - it is one of the industry standard sizes, so it should only be a matter |
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96 of getting a semi-custom one with the right interface (16-bit parallel) and the |
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97 right polarizer orientation (6 o'clock viewing direction). The proposed board |
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98 would be a derivative of our current FCDEV3B, keeping the core Calypso+RF block |
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99 (originally from Openmoko) completely unchanged, but adding the LCD, the keypad |
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100 buttons and other handset peripherals, resulting in a Handset Motherboard |
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101 Prototype - HSMBP. |
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102 |
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103 Different Calypso silicon versions |
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104 ================================== |
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105 |
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106 Because the D-Sample was a development board rather than a commercial end user |
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107 product, different D-Sample boards at different points in time had different |
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108 versions of the Calypso chip populated on them as the Calypso silicon itself |
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109 evolved. The board we got appears to be an early one, as it has Calypso chip |
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110 version F741979B on it (C05 rev B, DSP ROM version 3311), but I can only reason |
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111 that later D-Sample boards must have had Calypso C035 chips on them, either the |
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112 original Calypso C035 with DSP ROM version 3416 or the final silicon with DSP |
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113 ROM version 3606. |
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114 |
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115 Because we only have one D-Sample board and we have no idea whether or not there |
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116 are any other DS boards out there in the world (ours may well be the world's |
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117 last remaining unit), our dsample build target in FC Magnetite is set up for |
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118 Calypso chip version c05b by default, which is the version we got. If anyone |
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119 else in the world has another D-Sample board and it has a different Calypso |
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120 chip version on it, if you would like to run our FC Magnetite firmware on it, |
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121 you will need to follow the instructions in the Calypso-version-override |
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122 article. |