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+.TH HWCLOCK 5 "Feb 2012" "" "Debian Administrator's Manual"
+.SH NAME
+hwclock \- variables that affect the behaviour of the hwclock boot script
+.SH DESCRIPTION
+The
+.I /etc/default/rcS
+file contains variable settings in POSIX format:
+.IP "" .5i
+VAR=VAL
+.PP
+Only one assignment is allowed per line.
+Comments (starting with '#') are also allowed.
+
+.SH OPTIONS
+The following variables can be set.
+
+.IP \fBBADYEAR\fP
+This is used to specify that the hardware clock is incapable of storing
+years outside the range of 1994-1999.  Set to \fByes\fP if the hardware is
+broken or \fBno\fP if working correctly.
+
+.IP \fBHWCLOCKACCESS\fP
+If the hardware clock is not accessible, set to \fBno\fP, in which
+case hwclock will not be run.  Otherwise, set to \fByes\fP.
+
+.IP \fBHWCLOCKPARS\fP
+Additional options for hwclock.  Unset by default.  For example, this
+may be use to specify the machine hardware clock type for Alphas.
+
+.IP \fBHCTOSYS_DEVICE\fP
+The hardware clock device you want to use.  Defaults to \fBrtc0\fP.
+It should probably match the CONFIG_RTC_HCTOSYS_DEVICE kernel config
+option.
+
+.SH AUTHOR
+Roger Leigh <rleigh@debian.org>
+
+.SH SEE ALSO
+.BR hwclock (8),
+.BR rcS (5).