freecalypso-docs: FC-modem-family annotate

annotate FC-modem-family @ 23:14391ad53281

FCDEV3B-repackaging article removed for legal reasons The idea expressed in that article, namely the idea that some party other than Mother Mychaela could be permitted to create a derived work based on FCDEV3B board design and have it be accepted into the FreeCalypso family, is no longer allowed by our current stance on the matters of intellectual property, particularly Falconia IP. For technical content, the new FC-modem-family and Quadband-ideas articles should fully supplant this old FCDEV3B-repackaging article.

author	Mychaela Falconia <falcon@freecalypso.org>
date	Wed, 23 Oct 2019 00:43:21 +0000
parents	69ee60206c53
children	1e76655a44bd

rev	line source
21 69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	1 I, Mother Mychaela, have a vision for a family of FreeCalypso modem products in
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	2 different physical form factors, possibly with variations in offered
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	3 functionality, all sharing the same fcmodem firmware build target - meaning that
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	4 the same FreeCalypso fw built for the fcmodem target (a proposed successor to
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	5 the current fcdev3b build target) will run on all FC modem hw products,
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	6 requiring some commonalities across the entire product family but also
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	7 supporting some variations. The following design constraints are hereby being
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	8 laid down in order to make this common fcmodem firmware possible:
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	9
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	10 * All FC modem products will be either triband or quadband: triband if the
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	11 current Openmoko-based RFFE is kept as is (the safer route with less effort
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	12 and design labor cost) or quadband if the customer commissioning a modem
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	13 product is more adventurous and willing to pay more and take greater risks in
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	14 order to get full quadband capability. Please refer to the Quadband-ideas
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	15 article for further details.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	16
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	17 * Flash chip type autodetection in both fc-loadtool and firmware FFS driver code
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	18 allows different flash chip types to be used depending on business needs,
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	19 parts availability and the available physical space on the PCB. Flash
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	20 capacity can range from 4 MiB (minimum fw requirement) to 16 MiB (maximum
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	21 Calypso addressing capability); if a 16 MiB flash chip with two 8 MiB chip
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	22 select banks is used, then the second bank must be on nCS2 (like on FCDEV3B),
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	23 not on any other Calypso chip select.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	24
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	25 * External RAM (XRAM) capacity can range from 512 KiB (minimum fw requirement)
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	26 to 8 MiB (maximum Calypso addressing capability), but it will always be on
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	27 nCS1, not on any other Calypso chip select.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	28
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	29 * The extra logic voltage level translating buffer IC that was introduced on
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	30 FCDEV3B V2 in order to make flash reset timing compatible with S71PL129N flash
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	31 may or may not be included. The Mother's preference is to include it when
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	32 possible in order to increase the repertoire of usable flash chips, but if a
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	33 given design allows no PCB space for this extra little IC, then it will be
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	34 acceptable to go back to driving the flash reset line with FDP and require
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	35 the use of some flash chip other than S71PL129N - if the same footprint needs
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	36 to be kept and/or maximum flash and RAM capacity is desired, S71PL129J can be
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	37 used instead.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	38
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	39 MCSI
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	40 ====
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	41
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	42 It is envisioned that most FC modem products will provide a digital voice
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	43 interface via MCSI as a major feature, but some may not. If a given product
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	44 does feature MCSI, pull-down resistors for MCSI_CLK and MCSI_FSYNCH will need
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	45 to be included on the modem module itself, so that the user always sees them as
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	46 non-floating outputs from the modem. MCSI_RXD will be a pure input without
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	47 on-board pull-up or pull-down resistors, i.e., the user will be responsible for
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	48 tying it off or pulling it to a stable logic level if it is unused.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	49
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	50 However, if a given product does not feature MCSI, then it will be an unwelcome
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	51 burden to require extra pull-down resistors on the PCB, hence a different
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	52 provision is planned. If and when we ever produce a FreeCalypso modem without
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	53 MCSI, we will program a /etc/fc-pinmux file in FFS telling our fcmodem firmware
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	54 to switch the MCSI pins into GPIO mode and to drive all 4 of them as dummy
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	55 outputs, eliminating floating I/O pins without any effort from the hardware
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	56 side.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	57
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	58 Why would a FreeCalypso modem product not feature MCSI? Two use cases are
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	59 envisioned here:
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	60
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	61 * The new GTA02-like smartphone motherboard thought experiment - see the
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	62 corresponding section at the end of this article;
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	63
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	64 * If we ever produce a FreeCalypso modem in the form factor of a USB dongle for
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	65 laptops, it would be very easy to incorporate an FT2232x adapter presenting
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	66 both Calypso UARTs to the USB host, but adding a USB-to-MCSI bridge would
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	67 entail much greater complexity, hence it may make sense to omit MCSI for this
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	68 product and instead provide an analog headset jack for voice calls.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	69
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	70 GPIO
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	71 ====
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	72
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	73 Our firmware configures Calypso GPIO 3 as an input; GPIOs 0-2 and those
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	74 multifunction pins which are unused and configured as GPIOs (TSPDI/IO4,
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	75 BCLKX/IO6, MCUEN1/IO8 and MCUEN2/IO13) are configured as outputs. Board wiring
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	76 must be compatible with these directions: those pins which our fw drives as
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	77 outputs can be simply left unconnected, while GPIO 3 needs to be sensibly driven
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	78 or tied off as explained below.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	79
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	80 Openmoko's modem puts out an application processor wakeup signal (asserted by
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	81 the fw when the modem needs to send something to the host but is blocked by CTS
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	82 being held high) on GPIO 1. In order to have full feature parity, our FC modems
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	83 will provide an equivalent signal as well, but we are moving it to GPIO 0
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	84 because in FreeCalypso GPIO 1 is already taken for the loudspeaker control
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	85 signal like on TI's D-Sample and Leonardo boards. Our firmware's complete GPIO
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	86 usage thus becomes:
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	87
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	88 GPIO0: application processor wakeup signal
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	89 GPIO1: loudspeaker amplifier on/off control
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	90 GPIO2: DCD modem control output
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	91 GPIO3: DTR modem control input
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	92 all others: dummy outputs
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	93
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	94 Because GPIO3/DTR is an input, it needs to be either sensibly driven or tied
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	95 off. On our current FCDEV3B this line has a 100 kOhm pull-down resistor to GND,
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	96 but it is not accessible to the user in any way - this design aspect was copied
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	97 from TI's Leonardo board before I thought better. Most of our future FC modem
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	98 products are planned to have DTR as a user input signal (which the user can tie
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	99 off it is not used or needed in a given application), but if there is no DTR
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	100 user input signal on a given modem product, then GPIO3 will be grounded inside
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	101 the modem to keep the firmware happy.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	102
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	103 Calypso's unused DSR_MODEM/LPG pin was left unconnected in Openmoko's version
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	104 but on our FCDEV3B it is tied to GND on the board. Future FC modem family
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	105 boards will also need to have this pin tied to GND: our firmware leaves this
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	106 pin in its default power-up config of DSR_MODEM input and does not change it to
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	107 LPG output, thus leaving it unconnected would cause it to float.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	108
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	109 Extreme case: a new GTA02-like smartphone motherboard
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	110 =====================================================
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	111
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	112 A rather extreme thought-experiment test case for the FC modem family idea
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	113 presented in this article is this thought: suppose we wanted to produce a new
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	114 GTA02-like smartphone motherboard, bringing Openmoko's dream back from the dead.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	115 We could try to make a verbatim clone of GTA02-MB-A6 from OM, but for both
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	116 technical and political reasons it would be desirable to make a few changes:
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	117
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	118 * Making a strictly verbatim clone of GTA02-MB-A6 would mean populating a
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	119 Samsung K5A3281CTM memory chip onto OM's PCB footprint which does not really
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	120 fit this chip properly. Changing the PCB footprint to fit K5A32xx more
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	121 properly would not be easy because there are signal traces in the PCB spots
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	122 where the extra mounting balls for K5A32xx would need to go. The approach
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	123 that seems most naturally sensible would be to populate a better-fitting
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	124 memory chip, such as Spansion S71PL129JB0BAW9Z for which that footprint was
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	125 properly made - but then the result would no longer be a verbatim clone of
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	126 OM's version, and our gtamodem target configuration would no longer fit. And
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	127 at that point it would make the most sense to stop following the gtamodem
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	128 config and to make it an fcmodem family product instead.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	129
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	130 * It would be politically preferable if the new GTA02-like motherboard would run
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	131 fcmodem firmware rather than gtamodem, making a clean break from those parts
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	132 of OM's troubled history which caused them to be Closedmoko during certain
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	133 years.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	134
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	135 Hence the technical challenge: would it be possible to make a GTA02 derivative
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	136 with absolutely minimal changes that would run fcmodem firmware instead of
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	137 legacy mokoN or FC fw builds for the gtamodem target? The answer is yes, and
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	138 here is the recipe - note that no new components need to be added to the
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	139 extremely tight PCB layout:
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	140
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	141 * Move the 2nd flash chip select connection from nCS4 to nCS2 on the Calypso;
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	142
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	143 * Move the AP wakeup interrupt line from GPIO1 to GPIO0 to match fcmodem
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	144 firmware GPIO assignments;
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	145
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	146 * Take the useless INT0 AP-to-BP connection line present in the GTA02 original
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	147 and move it to Calypso GPIO3, providing fcmodem firmware with the DTR input
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	148 it expects;
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	149
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	150 * Ground Calypso's unused DSR_MODEM/LPG signal, causing it to not float when
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	151 our fcmodem firmware keeps the power-up default of DSR_MODEM function;
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	152
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	153 * Program /etc/fc-pinmux in FreeCalypso FFS to tell the firmware that there is
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	154 no MCSI on this board, so that all 4 MCSI signals will become GPIO dummy
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	155 outputs and won't float.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	156
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	157 Some additional changes which don't affect the firmware one way or the other:
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	158
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	159 * Remove R1003 and R1004 0Rs which seem to be the root cause of bug #1024 and
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	160 replace them with solid PCB traces;
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	161
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	162 * Up C1009 from 10 uF to 22 uF as additional guard from bug #1024;
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	163
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	164 * Ground Calypso's unused input RXIR_IRDA to keep it from floating - this input
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	165 cannot be changed to an output under firmware control without breaking other
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	166 functionality.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	167
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	168 At the same time it would also make a lot of sense to remove the Glamo graphics
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	169 decelerator from the AP subsystem, connecting the LCD directly to the Samsung AP
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	170 like it was on GTA01 - thus from the AP software perspective the new motherboard
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	171 would also become its own new platform just like the modem, very similar to the
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	172 GTA02 original, but not strictly identical, featuring some improvements instead.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	173
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	174 IP rights and FreeCalypso brand integrity
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	175 =========================================
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	176
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	177 The present vision of having the same fcmodem firmware support all FreeCalypso
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	178 modem products applies ONLY to those hardware products which are designed and
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	179 physically produced by Mother Mychaela or one of her business entities. We will
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	180 NOT provide any support whatsoever for any pirate hardware products that may be
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	181 produced by any persons or entities who are making, have made or are planning to
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	182 make inappropriate use of any of our published or unpublished board design
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	183 files.
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	184
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	185 In the event that some third party buys a legitimate license to produce their
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	186 own derived works based on FreeCalypso hardware designs, we may provide
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	187 technical support to that specific customer as per our agreement with them, but
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	188 any such support will be customer-specific: our generic, non-customer-specific
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	189 public FreeCalypso firmwares will only ever support our own official
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	190 Falconia/FreeCalypso modem products, and should not be expected to support any
69ee60206c53 FC-modem-family article written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	191 customized products made by or at the request of particular third parties.

FreeCalypso > hg > freecalypso-docs

annotate FC-modem-family @ 23:14391ad53281