FreeCalypso > hg > freecalypso-sw

annotate rvinterf/README @ 229:24ed817dd25d

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
tiffs IVA: reads image via mmap and displays block headers
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sat, 25 Jan 2014 23:56:47 +0000
parents f42854da4563
children f114f5c547ec
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
173
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
1 I (Spacefalcon the Outlaw, FreeCalypso developer) am still learning what kinds
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
2 of traffic may be passed across TI's RVTMUX binary-packet serial interface. We
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
3 already know that much of this traffic is debug trace output, i.e.,
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
4 unidirectional and essentially unconditional output from the GSM device. All
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
5 of the "standard" firmwares we have (mokoN, our leo2moko which functions almost
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
6 identically, and Pirelli's fw) produce massive volumes of such trace output in
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
7 normal operation. We already know that this "unsolicited" trace output comes
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
8 in at least 3 different flavors:
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
9
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
10 * RiViera traces emitted by rvf_send_trace()
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
11 * L1 traces
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
12 * G23 traces
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
13
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
14 The RVTMUX interface can be used for more than just trace output, though: any
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
15 component in TI's fw suite can send and/or register to receive binary packets.
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
16 As I slowly work my way through various components which comprise TI's Leonardo
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
17 fw whose semi-source we use as our reference version, learning what they do and
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
18 reintegrating them in our own gsm-fw, I will undoubtedly uncover additional uses
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
19 to which the RVTMUX interface is put.
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
20
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
21 Aside from the trivial provision in the RVT module itself whereby an external
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
22 host can send a command to the target to set a filter masking some of the RV
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
23 trace output, so far the only entity I've come across which accepts packets from
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
24 an external host is ETM (Enhanced Test Mode). ETM implements a registration
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
25 system of its own, whereby other modules can register with ETM to receive
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
26 certain external command messages passing first through RVT, then through ETM.
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
27
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
28 Because I do not yet have a clear mental picture of *every* function for which
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
29 the RVTMUX interface will ever be used, it is correspondingly impractical to
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
30 decide on a once-and-for-all design of what the host-side software for talking
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
31 to this interface should be like. Therefore, it is currently premature to
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
32 expect any stability in the present rvinterf subdirectory of freecalypso-sw; I
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
33 may implement something one day, then toss it away the next day (without
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
34 providing much in the way of backward compatibility) when I come up with some
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
35 other idea.
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
36
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
37 The current roadmap for what the rvinterf suite of host tools is envisioned to
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
38 look like eventually is as follows:
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
39
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
40 rvtdump Opens the serial port, decodes TI's binary packet protocol, and
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
41 simply dumps every received/decoded packet on stdout in a human-
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
42 readable form. No provision for sending anything to the target.
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
43 Intended use: observing the debug trace output which all TI
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
44 firmwares emit as standard "background noise". This utility has
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
45 already been written, and it allows one to observe/log/study the
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
46 "noise" that appears on Pirelli's USB-serial port (running
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
47 Pirelli's original fw), as well as that emitted on the IrDA
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
48 (headset jack) port on the GTA02 by mokoN/leo2moko firmwares.
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
49
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
50 rvinterf My plan is to make a copy of rvtdump, called rvinterf, and have
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
51 it act very much like rvtdump: receive TI's packets from the
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
52 serial port, decode them and print the decoded form on stdout.
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
53 However, rvinterf will also create a listening UNIX domain
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
54 socket to which other programs in the present suite will
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
55 connect. These other programs connecting through rvinterf will
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
56 be able to send packets to the target, as well as register to
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
57 receive certain kinds of target->host message packets.
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
58
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
59 fc-tmsh FreeCalypso Test Mode Shell is my vision for the utility which
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
60 will provide a practically usable interface to ETM. ETM's
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
61 general mode of operation seems to be (weasel phrase inserted
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
62 because many other fw components may connect through ETM, and I
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
63 have yet to study all of them) command-response: an external
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
64 host sends a command to ETM, that command gets dispatched to the
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
65 proper registered handler, the command function is executed, a
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
66 response packet is composed, and finally that response is sent
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
67 back to the host. But because all code on the target side is
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
68 under active development and debugging, we should not expect
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
69 perfect lock-step behaviour on the interface; instead, our
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
70 fc-tmsh should be fundamentally asynchronous: when the user
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
71 enters a command, the appropriate command packet is sent to the
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
72 target, but we are prepared for target->host messages at any
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
73 time, without enforcing strict correspondence to issued
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
74 commands: let the developer-operator sort that out instead.
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
75
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
76 The usage scenario I envision is that one will need to run rvinterf first
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
77 (either directly or through fc-xram) in one terminal window, leave it running,
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
78 then run fc-tmsh in another terminal window, and have it connect to rvinterf
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
79 via the local UNIX domain socket interface. Why such complexity, why not have
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
80 one program do everything? I suspect that in many debug/experimentation
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
81 sessions it will be necessary to use fc-tmsh on "noisy" targets, i.e., in
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
82 scenarios where the target is continuously spewing its "normal" voluminous debug
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
83 trace output, such that the "interesting" output as in responses to commands
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
84 gets drowned in the noise. In such a scenario it would be helpful to have one
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
85 terminal window in which one sees the transcript of the fc-tmsh session,
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
86 consisting of issued commands and received ETM responses without the general
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
87 noise, and another window in which one sees all RVTMUX interface activity in
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
88 real time - the latter would allow one to observe commands having side effects
f42854da4563 rvinterf: beginning of refactoring
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
89 outside of ETM, such as crashing the whole fw. :-)