FreeCalypso > hg > freecalypso-sw

annotate doc/RVTMUX @ 338:42bc1d7068ac

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
OSL reconstruction: os_pro_fl.c started
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 02 May 2014 06:36:17 +0000
parents d6dfad22cccd
children 821a26f90968
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
270
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
1 TI's Calypso GSM/GPRS baseband processor chip has not one but two UART serial
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
2 ports, called "MODEM" and "IrDA" in the hardware documentation. In hardware
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
3 terms, both support basic data-leads-only UART operation at a fixed baud rate,
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
4 but their extended capabilities differ: the IrDA UART adds IrDA capability (no
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
5 surprise), whereas the MODEM UART adds hardware flow control and autobaud. If
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
6 one is not implementing an actual IrDA interface, then the so-called "IrDA"
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
7 UART becomes a strict subset of the MODEM one in terms of hw capabilities -
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
8 just an extra UART, but a somewhat less capable one.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
9
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
10 In a classic modem design such as that present in the GTA0x smartphones made by
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
11 FIC/Openmoko, the Calypso presents a standard AT command interface on its MODEM
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
12 UART port. (In the case of GTA0x phones this serial channel is wired to the
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
13 phone's application processor; in a standalone modem it would be wired to a
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
14 USB-serial chip or even to a classic RS-232 DB25 port.) However, what is less
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
15 known is that the standard firmware for such modems simultaneously presents an
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
16 entirely different interface on the IrDA UART - an interface intended for
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
17 development, debugging and factory production testing (which includes RF
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
18 calibration and IMEI etc programming), rather than for "normal" end users.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
19
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
20 Normally this debug/development serial interface (called RVTMUX as will be
272
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
21 explained momentarily) is hidden from "ordinary" users - for example, on FIC
270
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
22 GTA0x phones it is wired to the analog headset jack through a hardware switch
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
23 which needs to be enabled through a GPIO signal from the AP. But there also
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
24 exist some oddball devices on which the RVTMUX interface is presented "in your
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
25 face". The Pirelli DP-L10 phone has a USB charging port which is also wired
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
26 (through a CP2102 USB-serial chip) to the IrDA UART on the Calypso - that's
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
27 right, IrDA, not MODEM - a design decision with which this hacker strongly
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
28 disagrees. (It'll definitely be wired to the MODEM UART instead on our own
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
29 semi-clone of this phone, but I digress.) Apparently Foxconn (the designers
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
30 of this phone) had no desire to provide a standard AT command interface, and
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
31 instead the only "official" way to use the "data" function of their USB port
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
32 (rather than the charging function) is for their "PC sync" feature, i.e., their
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
33 proprietary Weendoze software. And guess what, their proprietary "PC sync"
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
34 feature works over TI's RVTMUX interface, as that is what's presented on
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
35 Calypso's IrDA UART behind the CP2102!
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
36
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
37 OK, so what is this RVTMUX? RV stands for RiViera, an application framework
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
38 which TI added to their GSM firmware suite in the early 2000s, T stands for
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
39 trace, and MUX stands for multiplexor. It's a binary packet interface, although
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
40 many of these packets contain ASCII debug messages inside. The framing format
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
41 is the same in both directions: each packet begins and ends with an STX (0x02)
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
42 byte, all payload bytes except 0x02 and 0x10 are sent literally, and there is a
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
43 DLE (0x10) byte prepended before any 0x02 or 0x10 in the payload. It's the same
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
44 general principle as asynchronous HDLC (RFC 1662): packets can contain any
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
45 binary data, and the framing provides packet boundaries - although TI's version
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
46 is a little less robust than async-HDLC when it comes to recovering after lost
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
47 synchronization.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
48
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
49 The firmware suite component responsible for actually sending and receiving
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
50 these packets over the assigned UART port (usually IrDA, but can be MODEM too)
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
51 is called RVT (RiViera Trace), and it implements a MUX function. There are
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
52 several logical channels multiplexed over one physical serial port, and the
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
53 first byte of every packet indicates which logical channel it belongs to. Any
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
54 component within the GSM firmware suite can send packets to RVT for transmission
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
55 on this serial interface, and can also register to receive packets beginning
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
56 with a particular type ID byte.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
57
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
58 Use in FreeCalypso
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
59 ==================
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
60
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
61 The FreeCalypso project has adopted the same general firmware architecture as
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
62 that exhibited by TI's standard firmwares from the Moko/Pirelli time frame. We
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
63 use TI's RiViera framework lifted directly out of the TCS211 reference fw, and
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
64 that includes the RVT module and the RVTMUX interface it presents. At the
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
65 present time (early development stage, none of the actual GSM functionality has
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
66 been integrated yet) this RVTMUX interface is put to the following uses in our
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
67 own gsm-fw:
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
68
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
69 * Debug trace output from various components sent via the rvf_send_trace()
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
70 function - it is the RiViera Trace output in the proper sense;
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
71
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
72 * The ETM module and the associated FFS access protocol described below.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
73
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
74 In the existing proprietary firmwares which serve as our reference, the RVTMUX
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
75 serial channel is continuously spewing very voluminous debug output. This debug
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
76 output exhibits 3 different packet types: RV traces described above, and also
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
77 L1 and G23 traces, each in its own format. We expect that our own gsm-fw will
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
78 become just like these reference versions in this regard, once we integrate
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
79 those code layers.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
80
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
81 ETM and FFS access
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
82 ==================
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
83
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
84 Another component which we have lifted out of the TCS211 reference fw is ETM,
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
85 which stands for Enhanced Test Mode. This module registers its own "top level"
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
86 protocol over RVTMUX, and provides a registration service of its own, such that
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
87 various components in the fw suite can register to receive external command
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
88 packets passing first through RVT, then through ETM, and can send responses
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
89 passing through ETM, then through RVT back to the external host.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
90
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
91 The ETM_CORE module contained within ETM itself provides some low-level debug
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
92 commands: by sending the right binary command packets to the GSM device via the
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
93 RVTMUX serial channel, an external host can examine or modify any memory
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
94 location and any hardware register, cause the device to reset, etc.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
95
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
96 The only other ETM-based functionality currently integrated in our gsm-fw
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
97 besides ETM_CORE is TMFFS (Test Mode for FFS), which is the external access
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
98 channel to the device file system - see TIFFS-Overview. The TMFFS1 and TMFFS2
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
99 protocols provide a command/response packet interface to the FFS API functions
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
100 inside the fw, and enable an external host connected to the GSM device via the
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
101 RVTMUX channel to perform arbitrary read and write operations on the device
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
102 file system.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
103
272
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
104 TMFFS protocol versions
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
105 =======================
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
106
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
107 TI made two different and entirely incompatible versions of the TMFFS protocol
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
108 for accessing a device's FFS via RVT/ETM: TIFFS1 and TIFFS2. The fw sources
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
109 available to us contain implementations of both versions, so we have the freedom
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
110 to use whichever we like better for FreeCalypso. After studying the fw source
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
111 implementing the two TMFFS protocols, I (Space Falcon) came to the conclusion
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
112 that TMFFS2 is both more capable and more reliable; my guess is that TMFFS1 was
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
113 likely kept around only because some of TI's crappy Weendoze host software
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
114 depended on it. (See gsm-fw/services/ffs/tmffs.c if you would like to judge
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
115 for yourself.) Thus TMFFS2 is currently the "officially adopted" version for
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
116 FreeCalypso.
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
117
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
118 Our fc-tmsh utility (described below) allows a developer-operator to send TMFFS
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
119 "get version" queries to a running GSM fw in both ETM_FFS1 and ETM_FFS2 formats;
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
120 this capability allows us to determine experimentally which protocol (if any) is
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
121 implemented by a given proprietary firmware version. Experiments reveal that
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
122 Openmoko's moko11 firmware implements TMFFS1, whereas Pirelli's fw implements
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
123 TMFFS2.
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
124
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
125 The leo2moko-r1 firmware produced by the FreeCalypso project in 2013-10
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
126 implements TMFFS1, simply because that was the selected configuration in the
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
127 found Leonardo source that transitional fw is based on, and that release was
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
128 made before I learned RVTMUX, FFS, ETM and TMFFS properly. All future
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
129 FreeCalypso firmwares will use TIFFS2, or at least that's the current plan.
9c34d938a645 doc/RVTMUX: TMFFS protocol versions documented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 270
diff changeset
130
270
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
131 Host utility support
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
132 ====================
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
133
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
134 As one would naturally expect, the FreeCalypso project has developed some host
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
135 tools that allow a PC running GNU/Linux (or other Unix systems) to interface to
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
136 running firmwares on GSM devices via RVTMUX. The following tools are currently
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
137 available:
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
138
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
139 rvtdump Opens the serial port, decodes TI's binary packet protocol, and
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
140 simply dumps every received/decoded packet on stdout in a human-
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
141 readable form. No provision for sending anything to the target.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
142 Intended use: observing the debug trace output which all TI
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
143 firmwares emit as standard "background noise". This utility
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
144 allows one to observe/log/study the "noise" that appears on
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
145 Pirelli's USB-serial port (running Pirelli's original fw),
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
146 as well as that emitted on the IrDA (headset jack) port on the
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
147 GTA02 by mokoN/leo2moko firmwares.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
148
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
149 rvinterf Provides a bidirectional interface to RVTMUX on the host side.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
150 It dumps and/or logs the "background noise" emitted by the
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
151 target just like rvtdump, but also creates a local UNIX domain
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
152 socket on the host machine to which other programs can connect,
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
153 replicating the MUXing function on the host side.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
154
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
155 fc-tmsh Interactive asynchronous test mode shell. This program connects
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
156 to a target GSM device through rvinterf and allows a developer-
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
157 operator to send various ETM commands to the target. ETM
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
158 responses are decoded (sometimes only lightly) and displayed.
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
159 fc-tmsh is fully asynchronous in that it continuously listens
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
160 (via select(2)) for both user input and for packets from the
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
161 target at the same time, translating any user-entered commands
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
162 into packets to the target and conversely, scribbling on the
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
163 terminal when a packet arrives from the target. It has no
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
164 knowledge of any correspondence between commands and responses
d1388095ab27 doc/RVTMUX write-up
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
165 they normally elicit.
273
d6dfad22cccd doc/RVTMUX: note about fc-tmsh ffs2 commands being a known dead end
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 272
diff changeset
166
d6dfad22cccd doc/RVTMUX: note about fc-tmsh ffs2 commands being a known dead end
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 272
diff changeset
167 fc-tmsh implements some low-level ffs2 commands (see above regarding our design
d6dfad22cccd doc/RVTMUX: note about fc-tmsh ffs2 commands being a known dead end
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 272
diff changeset
168 decision to use TMFFS2 rather than TMFFS1), but it is already known that this
d6dfad22cccd doc/RVTMUX: note about fc-tmsh ffs2 commands being a known dead end
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 272
diff changeset
169 implementation approach is a dead end, and a different host utility is planned
d6dfad22cccd doc/RVTMUX: note about fc-tmsh ffs2 commands being a known dead end
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 272
diff changeset
170 to be written for full FFS read/write access via the TMFFS2 protocol.