freecalypso-tools: doc/RVTMUX annotate

annotate doc/RVTMUX @ 619:f82551c77e58

libserial-newlnx: ASYNC_LOW_LATENCY patch reverted Reports from Das Signal indicate that loadtools performance on Debian is about the same as on Slackware, and that including or omitting the ASYNC_LOW_LATENCY patch from Serg makes no difference. Because the patch in question does not appear to be necessary, it is being reverted until and unless someone other than Serg reports an actual real-world system on which loadtools operation times are slowed compared to the Mother's Slackware reference and on which Slackware-like performance can be restored by setting the ASYNC_LOW_LATENCY flag.

author	Mychaela Falconia <falcon@freecalypso.org>
date	Thu, 27 Feb 2020 01:09:48 +0000
parents	06442f27b144
children

rev	line source
430 06442f27b144 doc/RVTMUX: added note at the beginning about paradigm changes Mychaela Falconia <falcon@freecalypso.org> parents: 429 diff changeset	1 [Historical note: this document was originally written in 2014 when the vision
06442f27b144 doc/RVTMUX: added note at the beginning about paradigm changes Mychaela Falconia <falcon@freecalypso.org> parents: 429 diff changeset	2 of FreeCalypso was very different from what it is today. Since then we have
06442f27b144 doc/RVTMUX: added note at the beginning about paradigm changes Mychaela Falconia <falcon@freecalypso.org> parents: 429 diff changeset	3 transitioned from making aftermarket hacks on pre-existing Calypso phones and
06442f27b144 doc/RVTMUX: added note at the beginning about paradigm changes Mychaela Falconia <falcon@freecalypso.org> parents: 429 diff changeset	4 modems to producing and supporting our own FreeCalypso hardware products, and
06442f27b144 doc/RVTMUX: added note at the beginning about paradigm changes Mychaela Falconia <falcon@freecalypso.org> parents: 429 diff changeset	5 our firmware work has changed from a nebulous dream to stable production code.
06442f27b144 doc/RVTMUX: added note at the beginning about paradigm changes Mychaela Falconia <falcon@freecalypso.org> parents: 429 diff changeset	6 The ways in which we approach various technical aspects have changed
06442f27b144 doc/RVTMUX: added note at the beginning about paradigm changes Mychaela Falconia <falcon@freecalypso.org> parents: 429 diff changeset	7 accordingly, but much of our documentation has been slow to catch up. The
06442f27b144 doc/RVTMUX: added note at the beginning about paradigm changes Mychaela Falconia <falcon@freecalypso.org> parents: 429 diff changeset	8 documentation is now being updated, but there may still be some passages where
06442f27b144 doc/RVTMUX: added note at the beginning about paradigm changes Mychaela Falconia <falcon@freecalypso.org> parents: 429 diff changeset	9 the old world view shines through.]
06442f27b144 doc/RVTMUX: added note at the beginning about paradigm changes Mychaela Falconia <falcon@freecalypso.org> parents: 429 diff changeset	10
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	11 TI's Calypso GSM/GPRS baseband processor chip has not one but two UART serial
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	12 ports, called "MODEM" and "IrDA" in the hardware documentation. In hardware
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	13 terms, both support basic data-leads-only UART operation at a fixed baud rate,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	14 but their extended capabilities differ: the IrDA UART adds IrDA capability (no
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	15 surprise), whereas the MODEM UART adds hardware flow control and autobaud. If
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	16 one is not implementing an actual IrDA interface, then the so-called "IrDA"
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	17 UART becomes a strict subset of the MODEM one in terms of hw capabilities -
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	18 just an extra UART, but a somewhat less capable one.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	19
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	20 In a classic modem design such as that present in the GTA0x smartphones made by
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	21 FIC/Openmoko, the Calypso presents a standard AT command interface on its MODEM
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	22 UART port. (In the case of GTA0x phones this serial channel is wired to the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	23 phone's application processor; in a standalone modem it would be wired to a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	24 USB-serial chip or even to a classic RS-232 DB25 port.) However, what is less
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	25 known is that the standard firmware for such modems simultaneously presents an
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	26 entirely different interface on the IrDA UART - an interface intended for
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	27 development, debugging and factory production testing (which includes RF
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	28 calibration and IMEI etc programming), rather than for "normal" end users.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	29
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	30 Normally this debug/development serial interface (called RVTMUX as will be
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	31 explained momentarily) is hidden from "ordinary" users - for example, on FIC
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	32 GTA0x phones it is wired to the analog headset jack through a hardware switch
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	33 which needs to be enabled through a GPIO signal from the AP. On Mot C139 and
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	34 its siblings the situation is similar: one needs to key in the secret magic
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	35 sequence **16379#, and then the firmware presents a hidden menu for switching
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	36 the analog headset jack between its "normal" function and the UART carrying
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	37 RVTMUX.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	38
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	39 But there also exist some oddball devices on which the RVTMUX interface is
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	40 presented "in your face". The Pirelli DP-L10 phone has a USB charging port
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	41 which is also wired (through a CP2102 USB-serial chip) to the IrDA UART on the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	42 Calypso - that's right, IrDA, not MODEM - a design decision with which this
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	43 hacker strongly disagrees. (It'll definitely be wired to the MODEM UART
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	44 instead on our own semi-clone of this phone, but I digress.) Apparently Foxconn
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	45 (the designers of this phone) had no desire to provide a standard AT command
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	46 interface, and instead the only "official" way to use the "data" function of
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	47 their USB port (rather than the charging function) is for their "PC sync"
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	48 feature, i.e., their proprietary Weendoze software. And guess what, their
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	49 proprietary "PC sync" feature works over TI's RVTMUX interface, as that is
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	50 what's presented on Calypso's IrDA UART behind the CP2102!
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	51
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	52 OK, so what is this RVTMUX? RV stands for RiViera, an application framework
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	53 which TI added to their GSM firmware suite in the early 2000s, T stands for
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	54 trace, and MUX stands for multiplexor. It's a binary packet interface, although
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	55 many of these packets contain ASCII debug messages inside. The framing format
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	56 is the same in both directions: each packet begins and ends with an STX (0x02)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	57 byte, all payload bytes except 0x02 and 0x10 are sent literally, and there is a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	58 DLE (0x10) byte prepended before any 0x02 or 0x10 in the payload. It's the same
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	59 general principle as asynchronous HDLC (RFC 1662): packets can contain any
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	60 binary data, and the framing provides packet boundaries - although TI's version
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	61 is a little less robust than async-HDLC when it comes to recovering after lost
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	62 synchronization.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	63
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	64 The firmware suite component responsible for actually sending and receiving
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	65 these packets over the assigned UART port (usually IrDA, but can be MODEM too,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	66 as on Compal phones for example) is called RVT (RiViera Trace), and it
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	67 implements a MUX function. There are several logical channels multiplexed over
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	68 one physical serial port, and the first byte of every packet indicates which
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	69 logical channel it belongs to. Any component within the GSM firmware suite can
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	70 send packets to RVT for transmission on this serial interface, and can also
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	71 register to receive packets beginning with a particular type ID byte.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	72
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	73 Debug trace output
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	74 ==================
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	75
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	76 All GSM device firmwares that are based on TI's Calypso chipset reference fw
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	77 continuously emit quite voluminous debug trace output on their RVTMUX serial
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	78 port, whether it is hidden or exposed on a given device. Like all RVTMUX
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	79 traffic, this debug trace output takes the form of binary packets as explained
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	80 above, but the content of these packets is mostly ASCII with some binary header
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	81 bytes prepended. FreeCalypso host utility rvtdump captures all serial output
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	82 from a GSM device's RVTMUX port, parses the packet structure and displays this
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	83 output in line-oriented pure ASCII with all binary parts decoded.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	84
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	85 Test Mode commands
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	86 ==================
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	87
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	88 The other major use of the RVTMUX interface is sending so-called Test Mode
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	89 commands from an external host to a running GSM device. Depending on the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	90 firmware version, a GSM device can be commanded to do any of the following
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	91 things through this mechanism:
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	92
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	93 * Exercise RF test modes, e.g., transmit continuously at a set frequency and
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	94 power level;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	95 * Read and write arbitrary memory locations in the Calypso ARM7 address space;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	96 * Read and write ABB chip registers;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	97 * Reboot or power off;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	98 * Access and manipulate the device's flash file system (FFS).
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	99
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	100 In the segment of history of interest to us TI has produced two different
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	101 target firmware components that can receive, interpret and act upon Test Mode
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	102 command packets:
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	103
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	104 * The original Test Mode component of Layer 1, called L1TM or TML1: this
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	105 component handles all RF test modes (needed for RF calibration on device
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	106 production lines), and originally it also implemented memory and ABB register
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	107 read and write commands, and provided access to TMFFS1 (see below). In the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	108 original implementation this component registered itself as the handler for
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	109 the "TM" RVTMUX channel (RVT packet type 0x14), so it would receive all TM
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	110 packets sent to the device.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	111
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	112 * Enhanced Test Mode (ETM) is a later invention. It registers itself (instead
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	113 of the old TM in L1) with RVT as the handler for the "TM" RVTMUX channel, and
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	114 then provides a registration service of its own, such that various components
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	115 in the fw suite can register to receive external command packets passing
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	116 first through RVT, then through ETM, and can send responses passing through
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	117 ETM, then through RVT back to the external host. If a given fw version
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	118 contains both ETM and L1TM, then L1TM registers itself with ETM; an external
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	119 host would send exactly the same binary command packets to exercise RF test
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	120 modes, but inside the firmware they now pass through ETM on their way to L1TM.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	121
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	122 The ETM_CORE module contained within ETM itself provides some low-level debug
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	123 commands: by sending the right binary command packets to the GSM device via the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	124 RVTMUX serial channel, an external host can examine or modify any memory
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	125 location and any hardware register, cause the device to reset, etc. Prior to
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	126 ETM some of these functions (but not all) could be exercised through older TM3
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	127 commands, but in FreeCalypso we became familiar with the ETM versions of these
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	128 commands long before the older ones because we got the ETM component in full
429 05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	129 source form, whereas the sole surviving copy of TCS211 that serves as our golden
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	130 reference came with L1TM in binary object form like the rest of L1, and we got
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	131 to source-reconstructing it only much later.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	132
429 05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	133 Our TCS211 reference fw has both ETM and L1TM, thus it accepts both ETM and TM3
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	134 command packets; the same holds for our current production firmwares that are
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	135 based on this TCS211 reference. ETM commands (including TMFFS2, see below) also
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	136 work on Pirelli's fw, but Mot/Compal's original fw for the C139 has only the
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	137 original non-enhanced Test Mode, not ETM.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	138
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	139 FFS access via TM/ETM
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	140 =====================
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	141
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	142 One of the essential facilities provided in one form or another in all known
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	143 incarnations of the Test Mode mechanism is the ability to access and manipulate
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	144 the GSM device's flash file system (FFS). See TIFFS-Overview for a description
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	145 of this file system. TI's TMFFS1 and TMFFS2 protocols provide a command and
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	146 response packet interface to the FFS API functions inside the fw, and enable an
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	147 external host connected to the GSM device via the RVTMUX channel to perform
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	148 arbitrary read and write operations on the device file system.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	149
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	150 In the segment of history of interest to us TI has produced two different
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	151 and entirely incompatible versions of the TMFFS protocol: TMFFS1 and TMFFS2.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	152 Or rather, what is now called TMFFS1 was originally just TMFFS, and then came
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	153 TMFFS2. TMFFS2 works only through ETM, whereas TMFFS1 predates ETM: in the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	154 original implementation the tm_ffs() function in the FFS code was called from
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	155 L1TM code.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	156
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	157 Our copy of TCS211 reference fw includes the source for both TMFFS1 and TMFFS2;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	158 it is theoretically possible to build a firmware image that includes both TMFFS
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	159 versions (they won't conflict because they respond to different command
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	160 packets), but it is pretty clear that TI never intended to have both enabled
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	161 at the same time. Our copy of TCS211 came with TMFFS1 enabled and we didn't
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	162 change it when we made the moko12 (leo2moko-r1) fw release for the Openmoko
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	163 community (the previous proprietary mokoN firmwares also implement TMFFS1),
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	164 but we have subsequently switched to TMFFS2 for our current TCS211-based work.
429 05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	165 Our current production firmwares implement TMFFS2.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	166
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	167 Pirelli's fw implements TMFFS2: we don't have any source for this fw, but our
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	168 FreeCalypso host utilities written to talk the TMFFS2 protocol based on our
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	169 available TCS211 source work beautifully when run against Pirelli's fw.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	170
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	171 Use in FreeCalypso
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	172 ==================
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	173
429 05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	174 Our current production firmwares for FreeCalypso modems faithfully follow the
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	175 architecture of TI's TCS211 without any fundamental changes. Thus the
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	176 functionality which we present via RVTMUX is exactly the same as TI's original:
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	177 our firmwares emit the same 3 kinds of debug traces (RV, L1 and GPF) as various
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	178 pre-existing ones, and for Test Mode functionality we have ETM, L1TM and TMFFS2.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	179
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	180 We have adopted ETM and TMFFS2 as the standard combination for FreeCalypso,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	181 i.e., ETM_CORE for memory and ABB register reads and writes and TMFFS2 for
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	182 external FFS access. We needed to develop our own host tools for operating on
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	183 GSM device FFS via one of the two TMFFS protocols, and after studying the fw
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	184 source implementing both, I (Space Falcon) came to the conclusion that TMFFS2
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	185 is both more capable and more reliable; my guess is that TMFFS1 was likely kept
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	186 around only because some of TI's crappy Weendoze host software depended on it.
18 d9307880f59f doc/RVTMUX: reference to TI's tmffs.c source updated for the repository split Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	187 (See chipsetsw/drivers/drv_app/ffs/board/tmffs.c in leo2moko or tcs211-fcmodem
d9307880f59f doc/RVTMUX: reference to TI's tmffs.c source updated for the repository split Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	188 if you would like to judge for yourself.)
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	189
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	190 We have the following host tools for communicating with TI-based GSM firmwares
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	191 (both our own and some of the existing proprietary ones):
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	192
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	193 rvtdump This tool produces a human-readable dump of all output emitted
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	194 by a TI-based GSM fw in the form of RVTMUX binary packets. It
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	195 can also log this dump to a file.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	196
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	197 rvinterf This tool is a superset of rvtdump: it not only dumps and/or
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	198 logs all output from the GSM fw, but also provides a mechanism
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	199 for sending command packets to it.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	200
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	201 Rvinterf is the engine behind the following host tools that send Test Mode
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	202 commands to a target:
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	203
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	204 fc-tmsh This is our basic tool for sending Test Mode commands to a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	205 running GSM fw. It is strictly asynchronous in that commands
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	206 entered by the operator get sent to the target, and any response
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	207 packets received from the target are displayed as they come in.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	208 The tool has no knowledge of any correspondence between commands
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	209 being sent and whatever responses they should elicit, i.e., it
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	210 is perfectly suited for experimental discovery of firmware
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	211 behaviour in response to Test Mode commands.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	212
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	213 This tool was written before we realized that there was/is an
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	214 older, more basic Test Mode predating ETM, hence in many place
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	215 we say "ETM" when we really should have said "TM". Oh well...
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	216
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	217 fc-fsio This tool speaks the TMFFS2 protocol and allows a user or
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	218 developer to perform a wide range of operations on the file
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	219 system of a GSM device. It operates synchronously, i.e., it
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	220 sends ETM/TMFFS2 commands and expects responses in strict
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	221 lock-step; a single user command may translate into a large
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	222 number of ETM/TMFFS2 command packet exchanges.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	223
429 05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	224 fc-shell This tool is asynchronous like fc-tmsh, but instead of talking
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	225 and listening on the TM/ETM RVTMUX channel, it talks and listens
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	226 on GPF's channel and on the new AT-over-RVTMUX channel which we
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	227 added in FreeCalypso. fc-shell can be used to issue system
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	228 primitive commands to GPF (and to see firmware responses to
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	229 them), and to talk AT commands via RVTMUX.
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	230
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	231 AT commands over RVTMUX
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	232 =======================
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	233
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	234 There is one more use to which we put the RVTMUX debug serial interface that is
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	235 an original FreeCalypso invention: communicating with the AT command interpreter
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	236 (ATI). TI's original architecture assumes that if a product is to offer a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	237 standard AT command interface (the product is either a GSM/GPRS modem for which
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	238 this AT command interface is the sole mode of usage or a feature phone that
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	239 offers a data port as one of its features), then it will be presented on a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	240 dedicated UART separate from RVTMUX.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	241
429 05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	242 However, in the case of our FreeCalypso family of projects about 2 years had
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	243 passed between our first functional GSM fw attempts in 2015 and us successfully
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	244 building our own development board in 2017; during this time we had to work on
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	245 various crippled pre-existing Calypso devices, and many of them had only one
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	246 UART practically accessible. In response to this situation we developed a way
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	247 to pass AT commands over RVTMUX. We created a new RVTMUX channel for this
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	248 interface and assigned it RVT packet type 0x1A. Packets sent from an external
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	249 host to the GSM device carry AT commands and SMS string input, whereas packets
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	250 flowing the other way carry ATI's responses to commands and asynchronous
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	251 notifications such as incoming calls. The host utility for talking AT commands
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	252 to a FreeCalypso GSM device via RVTMUX is fc-shell, described above.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	253
429 05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	254 Now that we have built a proper FreeCalypso development board with two UARTs,
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	255 the use of this AT-over-RVTMUX hack is deprecated for general usage: this hack
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	256 does not support any data services (CSD or GPRS), and even for SMS it is
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	257 crippled because maximum-length messages cannot be sent in the more capable PDU
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	258 mode. However, it still comes in handy during certain casual testing sessions,
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	259 and it is required if one needs to run our FreeCalypso firmware on Mot C1xx or
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	260 Pirelli DP-L10 hardware.
223 ac49d8814893 doc/RVTMUX: keepalive mechanism documented Mychaela Falconia <falcon@freecalypso.org> parents: 18 diff changeset	261
ac49d8814893 doc/RVTMUX: keepalive mechanism documented Mychaela Falconia <falcon@freecalypso.org> parents: 18 diff changeset	262 Keepalive mechanism
ac49d8814893 doc/RVTMUX: keepalive mechanism documented Mychaela Falconia <falcon@freecalypso.org> parents: 18 diff changeset	263 ===================
ac49d8814893 doc/RVTMUX: keepalive mechanism documented Mychaela Falconia <falcon@freecalypso.org> parents: 18 diff changeset	264
429 05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	265 Another FreeCalypso addition to TI's RVTMUX interface is our keepalive mechanism
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	266 for the voice pseudo-modem hack on Mot C1xx targets. The FreeCalypso family
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	267 includes many subprojects, and one of these subprojects involves running modem-
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	268 like firmware (control via AT commands only, no local UI) on Mot C1xx phones.
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	269 Having a device that was originally made to be a phone with LCD and buttons
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	270 turn into a serially-controlled pseudo-modem (LCD stays dark, buttons do
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	271 nothing) feels quite weird, and this situation is exacerbated by the flashing
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	272 requirement: the only way to run our pseudo-modem fw on Mot C1xx phones is to
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	273 flash it, there is no way to run it out of RAM without disturbing the phone's
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	274 original fw.
223 ac49d8814893 doc/RVTMUX: keepalive mechanism documented Mychaela Falconia <falcon@freecalypso.org> parents: 18 diff changeset	275
429 05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	276 When our Magnetite and Selenite firmwares are built for a C1xx target in the
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	277 VPM configuration, they implement the following keepalive logic: if the phone
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	278 is powered on and running our fw, but the charging power source is not plugged
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	279 in, the fw sends periodic keepalive queries out the serial port to see if there
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	280 is a running rvinterf process on the other end of the wire, and automatically
05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	281 powers off if there is no keepalive response.
223 ac49d8814893 doc/RVTMUX: keepalive mechanism documented Mychaela Falconia <falcon@freecalypso.org> parents: 18 diff changeset	282
ac49d8814893 doc/RVTMUX: keepalive mechanism documented Mychaela Falconia <falcon@freecalypso.org> parents: 18 diff changeset	283 Code has been added to rvinterf to respond with a keepalive answer packet when
ac49d8814893 doc/RVTMUX: keepalive mechanism documented Mychaela Falconia <falcon@freecalypso.org> parents: 18 diff changeset	284 a keepalive query packet is received; the feature has been implemented on the
429 05dc91d011a6 doc/RVTMUX: updated for the current state of FreeCalypso Mychaela Falconia <falcon@freecalypso.org> parents: 223 diff changeset	285 rvinterf side first, and then subsequently in our Magnetite fw for C1xx targets.

FreeCalypso > hg > freecalypso-tools

annotate doc/RVTMUX @ 619:f82551c77e58