432
Mychaela Falconia <falcon@freecalypso.org>
parents:
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1 This document describes the basic usage principles for our rvinterf suite of
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
2 tools, which is the subset of FC host tools for talking to TI-based GSM devices
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
3 via the RVTMUX binary packet interface.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
4
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
5 rvtdump
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
6 =======
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
7
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
8 Rvtdump is a utility that listens on a serial port, receives traces or any other
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
9 packets emitted by the running firmware of a GSM device in TI's RVTMUX format,
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
10 decodes them into readable ASCII and emits them to stdout and/or to a log file.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
11 It is to be invoked as follows:
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
12
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
13 rvtdump [options] /dev/ttyXXX
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
14
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
15 where the sole non-option argument is the serial port it should open and listen
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
16 on.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
17
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
18 The available options are:
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
19
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
20 -b
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
21
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
22 Normally the rvtdump process remains in the foreground and emits its
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
23 output on stdout. The -b option suppresses the normal output and causes
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
24 rvtdump to put itself in the background: fork at startup, then have the
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
25 parent exit while the child remains running. -b is not useful and not
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
26 allowed without -l.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
27
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
28 -B baud
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
29
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
30 Selects which RVTMUX serial channel baud rate our tool should listen
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
31 for. Defaults to 115200 baud, which is TI's default and is correct for
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
32 our standard FreeCalypso firmwares, for Openmoko's legacy firmwares and
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
33 for Pirelli's proprietary fw. Use -B 57600 for Compal's RVTMUX, the
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
34 one accessible via **16379#.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
35
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
36 -d <file descriptor number>
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
37
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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38 This option is not meant for direct use by human users. It is inserted
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
39 automatically when rvtdump is launched from fc-xram as the secondary
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
40 program that immediately takes over the serial channel.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
41
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
42 -l logfile
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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changeset
|
43
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
44 Log all received and decoded packets into the specified file in addition
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
45 to (without -b) or instead of (with -b) dumping them on stdout. Each
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
46 line in the log file is also time-stamped; the timestamps are in GMT
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
47 (gmtime(3)) instead of local time - Spacefalcon the Outlaw dislikes
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
48 local times.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
49
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
50 rvinterf
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
51 ========
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
52
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
53 Rvinterf (the specific program by this name) is an extended version of rvtdump
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
54 (see above) that decodes and dumps and/or logs any and all output generated by
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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changeset
|
55 the firmware running on the target just like rvtdump, but also creates a local
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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changeset
|
56 UNIX domain socket on the host machine to which "client" programs can connect.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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changeset
|
57 "Client" programs connecting to rvinterf via this local socket interface can:
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
58
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
59 1. Receive copies of selected RVTMUX packets coming from the target;
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
60
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
61 2. Send arbitrary RVTMUX packets toward the target.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
62
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
63 Rvinterf is invoked just like rvtdump:
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
64
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
65 rvinterf [options] /dev/ttyXXX
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
66
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
67 The following options have the same meaning as in rvtdump, see the rvtdump
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
68 section above for the details: -b, -B, -d and -l. The only difference is that
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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changeset
|
69 -b without -l is potentially useful and thus allowed.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
70
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
71 Additional rvinterf options which don't exist in rvtdump are:
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
72
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
73 -n
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
74
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
75 Suppress the output on stdout like -b, but don't fork into background.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
76 This option is passed by "client" programs when they invoke rvinterf
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
77 behind the scenes instead of connecting to an already-running rvinterf
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
78 instance.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
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changeset
|
79
|
587
|
80 -P <boot control name>
|
|
81
|
|
82 See Target-boot-control article.
|
|
83
|
432
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
84 -s pathname_for_socket
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
85
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
86 By default the local UNIX domain socket created by rvinterf is bound to
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
87 /tmp/rvinterf_socket; this option allows any other pathname to be
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
88 specified.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
89
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
90 -S <file descriptor number>
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
91
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
92 This option is not meant for direct use by human users. It is passed
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
93 by "client" programs when they invoke rvinterf behind the scenes with
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
94 an unnamed and unbound socket pair instead of conecting to an already-
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
95 running rvinterf instance.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
96
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
97 -w number_in_seconds
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
98
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
99 Reliable UART communication with a Calypso GSM device that can
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
100 potentially enter the so-called "deep sleep" mode requires certain
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
101 special workarounds that could be described as a bit of an ugly hack:
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
102 see the Deep-sleep-support article for the gory details. The hack
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
103 implemented in rvinterf is as follows: if a packet is to be sent to the
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
104 target and more than a set time has elapsed since the last transmitted
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
105 packet, the packet is preceded by a "wake-up shot" of 64 0 bytes
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
106 (outside of a packet, ignored by the fw) and a 100 ms pause.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
107
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
108 The -w option changes the elapsed time threshold at which the "wake-up
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
109 shot" is sent; the default is 7 s. Specify -w 0 to disable this hack
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
110 altogether.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
111
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
112 Client programs
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
113 ===============
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
114
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
115 We have an entire family of so-called "client" programs which connect to
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
116 rvinterf via the local socket interface and use rvinterf as the back-end engine
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
117 for communicating with GSM device firmwares. The main ones are fc-fsio,
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
118 fc-shell and fc-tmsh described in the RVTMUX article, and the less important
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
119 ones are fc-memdump, fc-dspapidump, fc-readcal and fc-tmsync listed in
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
120 Host-tools-overview. There is also the fcup-rvtat program which is invoked
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
121 behind the scenes by fcup-* tools (see User-phone-tools) when they are used
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
122 with the -R option.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
123
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
124 All of these client programs can work in one of two ways: they can connect to
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
125 an already running rvinterf process through the UNIX domain socket mechanism,
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
126 or they can launch their own private instance of rvinterf behind the scenes,
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
127 using an unnamed and unbound socket pair. (Don't try to have two or more
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
128 rvinterf instances running on the same serial port, it won't work.) The
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
129 following command line options are standardized across all of our rvinterf
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
130 client programs:
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
131
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
132 -p /dev/ttyXXX
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
133
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
134 Don't connect to an already running rvinterf process, instead launch a
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
135 private instance of rvinterf on the named serial port.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
136
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
137 -B baud
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
138 -l logfile
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
139 -w number_in_seconds
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
140
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
141 These options are valid only when -p is used, and are passed through to
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
142 rvinterf.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
143
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
144 -s pathname_for_socket
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
145
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
146 Connect to a different local UNIX domain socket pathname instead of the
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
147 default /tmp/rvinterf_socket. This option is valid only when -p is not
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
148 used.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
149
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
150 Interactive vs. one-shot operation
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
151 ==================================
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
152
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
153 Our main client programs fc-fsio, fc-shell, fc-tmsh and fc-tmsync can operate
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
154 in both interactive and one-shot modes. If there is a specific command given
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
155 on the invokation command line, that command is executed in the one-shot mode
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
156 (the program executes that one command, waits for the response from the target
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
157 if appropriate, and exits), otherwise each of the listed programs enters its
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
158 own interactive mode with its own prompt. The more specialized client programs
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
159 fc-memdump, fc-dspapidump and fc-readcal always operate in the one-shot manner.
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
160
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
161 fc-fsio, fc-tmsync and the just-listed specialized client programs are
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
162 synchronous in nature: whether they are used interactively or in a one-shot
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
163 manner (single command per program invokation), all of their operations are
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
164 built from command-response primitives: each internal low-level function sends
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
165 a command packet to the target via rvinterf and waits for a response from the
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
166 target; not getting a response or getting a wrong or unexpected response is a
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
167 fatal error. There is no such thing as a no-wait mode (one-shot or otherwise)
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
168 with these synchronous programs. Furthermore, what appears to be a single
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
169 command at the high level may consist of a large number of command-response
|
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
170 packet exchanges under the hood, and the one-shot mode can be used equally
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171 easily to run a simple command or a script consisting of many commands. The
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172 fcup-* -R mechanism (implemented by way of the fcup-rvtat back-end program) is
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173 also synchronous like the fc-fsio and fc-tmsync family.
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174
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175 In contrast, fc-shell and fc-tmsh are asynchronous, and they work most naturally
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176 in their interactive mode. An interactive fc-shell or fc-tmsh session is a
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177 select loop that listens simultaneously for both user command input on the
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178 terminal and packets from the target on the rvinterf socket; user commands cause
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179 command packets to be sent to the target and any response packets received from
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180 the target are decoded and displayed on the terminal, but these two directions
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181 are completely decoupled from each other. The one-shot mode of operation is
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182 inherently less natural with these programs, and constitutes a bit of a hack.
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183
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184 fc-tmsh offers the same repertoire of commands in both interactive and one-shot
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185 modes, and each of these commands sends a Test Mode command packet to the
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186 target. The one-shot mode is actually two modes: one-shot with a wait for a
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187 target response (default) and one-shot with no wait (-n option). One-shot with
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188 no wait is straighforward: fc-tmsh constructs the requested TM command packet,
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189 sends it to the target via rvinterf and exits. In the other one-shot mode
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190 without -n, fc-tmsh sends the command packet to the target and falls into a loop
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191 processing input from rvinterf; as soon as some (any) packet is received from
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192 the target on the TM channel, that packet (which is decoded and displayed) is
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193 considered to be the response and the program exits with a success indication.
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194
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195 fc-shell is the oddest of the bunch: the set of one-shot commands is a subset
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196 of those available in the interactive mode, as some of the commands cannot work
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197 outside of the interactive mode select loop environment. Furthermore, almost
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198 all of the one-shot commands in fc-shell always operate in the no-wait manner
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199 whether -n is given or not. The only fc-shell one-shot commands which wait for
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200 a target response in the absence of -n (similarly to fc-tmsh) are AT commands.
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201
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202 Startup synchronization hack
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203 ============================
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204
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205 There is one annoying issue that has been seen with FTDI USB-serial adapters:
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206 when the serial port served by an FTDI adapter has been receiving serial traffic
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207 from the target while no host program is running with the port open to read it,
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208 and then a host program is started, that newly started host program will often
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209 get some stale or total garbage input from the freshly opened ttyUSBx port on
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Mychaela Falconia <falcon@freecalypso.org>
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210 startup. In most usage scenarios this issue is not a killer for our rvinterf
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Mychaela Falconia <falcon@freecalypso.org>
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211 suite, only an annoyance: if rvinterf is started on a serial port with this
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Mychaela Falconia <falcon@freecalypso.org>
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212 initial garbage, there will be some garbage displayed by rvinterf initially,
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Mychaela Falconia <falcon@freecalypso.org>
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213 but then it will quickly regain synchronization with the running firmware
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Mychaela Falconia <falcon@freecalypso.org>
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214 target. If there is any delay between the starting of rvinterf and command-
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Mychaela Falconia <falcon@freecalypso.org>
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215 response packet exchanges with the target (if rvinterf is run explicitly by the
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Mychaela Falconia <falcon@freecalypso.org>
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216 operator first and then the client program, or if the client program that
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Mychaela Falconia <falcon@freecalypso.org>
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217 launches rvinterf is an interactive one), no problems occur: rvinterf will be
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Mychaela Falconia <falcon@freecalypso.org>
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218 in sync with the target with all initial garbage flushed by the time it needs
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Mychaela Falconia <falcon@freecalypso.org>
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219 to do the first command-response packet exchange.
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Mychaela Falconia <falcon@freecalypso.org>
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220
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221 There is one potentially problematic usage scenario, though: consider what
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222 happens when a one-shot operation is commanded, it is a type of one-shot
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223 operation that includes waiting for a response from the target, and rvinterf is
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224 being launched from the client program with -p. In this scenario there will be
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225 a command packet sent to the target as soon as rvinterf starts up, and the
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226 client program will expect rvinterf to capture and deliver the target fw's
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Mychaela Falconia <falcon@freecalypso.org>
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227 response correctly, but there may not be enough time for rvinterf to clear the
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Mychaela Falconia <falcon@freecalypso.org>
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228 initial garbage presented by the imperfect serial port hardware+driver
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Mychaela Falconia <falcon@freecalypso.org>
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229 combination.
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230
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231 Our solution to this potential trouble source is a hack: in the special case
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232 when rvinterf is being launched by the client program with -p and when the
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Mychaela Falconia <falcon@freecalypso.org>
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233 client operation to be performed falls into the category of one-shot with a wait
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Mychaela Falconia <falcon@freecalypso.org>
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234 for the target fw response, a 30 ms delay is inserted after the return from the
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Mychaela Falconia <falcon@freecalypso.org>
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235 vfork call that launches rvinterf and before any actual operations. This hack
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Mychaela Falconia <falcon@freecalypso.org>
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236 has been deemed to be acceptable because this combination of doing one-shot
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Mychaela Falconia <falcon@freecalypso.org>
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237 operations while launching rvinterf with -p is not a very sensible way of using
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Mychaela Falconia <falcon@freecalypso.org>
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238 our rvinterf tools generally, hence it has been deemed acceptable to add a bit
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Mychaela Falconia <falcon@freecalypso.org>
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239 of slowdown to this rather contrived use case.
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