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annotate doc/C139-notes @ 273:5caa86ee2cfa

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enable L1_NEW_AEC in l1_confg.h (bold change) The AEC function implemented in DSP ROM 3606 on the Calypso silicon we work with is the one that corresponds to L1_NEW_AEC; the same holds for DSP 34 and even for DSP 33 with more recent patch versions. However, TI shipped their TCS211 reference fw with L1_NEW_AEC set to 0, thus driving AEC the old way if anyone tried to enable it, either via AT%Nxxxx or via the audio mode facility. As a result, the fw would try to control features which no longer exist in the DSP (long vs short echo and the old echo suppression level bits), while providing no way to tune the 8 new parameter words added to the DSP's NDB page. The only sensible solution is to bite the bullet and enable L1_NEW_AEC in L1 config, with fallout propagating into RiViera Audio Service T_AUDIO_AEC_CFG structure and into /aud/*.cfg binary file format. The latter fallout will be addressed in further code changes.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 29 Jul 2021 18:32:40 +0000
parents a62e5bf88434
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1 FC Tourmaline firmware differs from Magnetite in two principal ways when it
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2 comes to Mot C139 target support:
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3
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4 * C139 LCD support is implemented in a more forward-looking manner: instead of
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5 emulating TI's C-Sample at the lowest R2D driver level and therefore being
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6 forever limited to 84x48 pixel display size, Tourmaline implements a new
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7 96x64 pixel framebuffer, matching the native LCD size of C1xx phones. The UI
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8 configuration is still black&white only though - the Mother of FreeCalypso
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9 has no current plans to support color UI on smaller LCD sizes than TI's
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10 original 176x220 pix.
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11
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12 * Our aftermarket FFS configuration has been changed from 64x3 at 0x3C0000 to
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13 64x7 at 0x300000. Our earlier 64x3 config was chosen back in 2015, at that
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14 time we didn't know how much room we would end up needing for the firmware
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15 image vs. how much FFS content we would eventually have, and this 64x3 config
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16 is now deemed to be too small, allowing only one 64 KiB sector for FFS
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17 content. Our new FC Tourmaline aftermarket FFS config supports up to 320 KiB
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18 of FFS content, matches what we use on other platforms with 4 MiB flash chips,
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19 leaves 3 MiB for the firmware image (our current smallbw UI fw is only 2 MiB),
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20 and still avoids intersection with Motorola's (or rather Compal's) original
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21 FFS, which is important for avoiding problems in converting C139 phones back
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22 and forth between Motorola and FreeCalypso firmwares.