--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rvinterf/doc/rvtdump.usage	Sat Jun 11 00:13:35 2016 +0000
@@ -0,0 +1,40 @@
+Rvtdump is a utility that listens on a serial port, receives traces or any other
+packets emitted by the running firmware of a GSM device in TI's RVTMUX format,
+decodes them into readable ASCII and emits them to stdout and/or to a log file.
+It is to be invoked as follows:
+
+rvtdump [options] /dev/ttyXXX
+
+where the sole non-option argument is the serial port it should open and listen
+on.
+
+The available options are:
+
+-b
+
+	Normally the rvtdump process remains in the foreground and emits its
+	output on stdout.  The -b option suppresses the normal output and causes
+	rvtdump to put itself in the background: fork at startup, then have the
+	parent exit while the child remains running.  -b is not useful and not
+	allowed without -l.
+
+-B baud
+
+	Selects which RVTMUX serial channel baud rate our tool should listen
+	for.  Defaults to 115200 baud, which appears to be TI's default and is
+	correct for mokoN, leo2moko and Pirelli's fw.  Use -B 57600 for Compal's
+	RVTMUX, the one accessible via **16379#.
+
+-d <file descriptor number>
+
+	This option is not meant for direct use by human users.  It is inserted
+	automatically when rvtdump is launched from fc-xram as the secondary
+	program that immediately takes over the serial channel.
+
+-l logfile
+
+	Log all received and decoded packets into the specified file in addition
+	to (without -b) or instead of (with -b) dumping them on stdout.  Each
+	line in the log file is also time-stamped; the timestamps are in GMT
+	(gmtime(3)) instead of local time - Spacefalcon the Outlaw dislikes
+	local times.