FreeCalypso > hg > fc-tourmaline
view doc/C139-notes @ 221:5bf097aeaad7
LLS: when turning off all LEDs on boot, skip LED-C
Having LLS turn off LED-A and LED-B on boot is normally unnecessary
(they should already be off in Iota), but it is harmless, hence this
logic is kept for robustness. However, having LLS read-modify-write
the BCICTL2 register (to turn off LED-C) creates a potential race
condition with FCHG writes to this register, especially in the case
when baseband switch-on is caused by VCHG and charging is expected
to start right away. Furthermore, control of the charging LED itself
(on those hw targets that have it) is the responsibility of the FCHG
SWE, hence LLS should leave it alone.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Mon, 26 Apr 2021 21:55:13 +0000 |
parents | a62e5bf88434 |
children |
line wrap: on
line source
FC Tourmaline firmware differs from Magnetite in two principal ways when it comes to Mot C139 target support: * C139 LCD support is implemented in a more forward-looking manner: instead of emulating TI's C-Sample at the lowest R2D driver level and therefore being forever limited to 84x48 pixel display size, Tourmaline implements a new 96x64 pixel framebuffer, matching the native LCD size of C1xx phones. The UI configuration is still black&white only though - the Mother of FreeCalypso has no current plans to support color UI on smaller LCD sizes than TI's original 176x220 pix. * Our aftermarket FFS configuration has been changed from 64x3 at 0x3C0000 to 64x7 at 0x300000. Our earlier 64x3 config was chosen back in 2015, at that time we didn't know how much room we would end up needing for the firmware image vs. how much FFS content we would eventually have, and this 64x3 config is now deemed to be too small, allowing only one 64 KiB sector for FFS content. Our new FC Tourmaline aftermarket FFS config supports up to 320 KiB of FFS content, matches what we use on other platforms with 4 MiB flash chips, leaves 3 MiB for the firmware image (our current smallbw UI fw is only 2 MiB), and still avoids intersection with Motorola's (or rather Compal's) original FFS, which is important for avoiding problems in converting C139 phones back and forth between Motorola and FreeCalypso firmwares.