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annotate doc/C139-notes @ 197:a963d8cd8682

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bwsplash/README: additional notes
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 28 Mar 2021 23:51:56 +0000
parents a62e5bf88434
children
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Mychaela Falconia <falcon@freecalypso.org>
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1 FC Tourmaline firmware differs from Magnetite in two principal ways when it
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Mychaela Falconia <falcon@freecalypso.org>
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2 comes to Mot C139 target support:
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3
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Mychaela Falconia <falcon@freecalypso.org>
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4 * C139 LCD support is implemented in a more forward-looking manner: instead of
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Mychaela Falconia <falcon@freecalypso.org>
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5 emulating TI's C-Sample at the lowest R2D driver level and therefore being
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Mychaela Falconia <falcon@freecalypso.org>
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6 forever limited to 84x48 pixel display size, Tourmaline implements a new
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Mychaela Falconia <falcon@freecalypso.org>
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7 96x64 pixel framebuffer, matching the native LCD size of C1xx phones. The UI
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Mychaela Falconia <falcon@freecalypso.org>
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8 configuration is still black&white only though - the Mother of FreeCalypso
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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13 64x7 at 0x300000. Our earlier 64x3 config was chosen back in 2015, at that
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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.