diff --git a/share/man/man4/mk48txx.4 b/share/man/man4/mk48txx.4 index 5fe9a3eb9c8e..7adfa164ffea 100644 --- a/share/man/man4/mk48txx.4 +++ b/share/man/man4/mk48txx.4 @@ -1,4 +1,4 @@ -.\" $NetBSD: mk48txx.4,v 1.10 2003/04/16 13:35:17 wiz Exp $ +.\" $NetBSD: mk48txx.4,v 1.11 2003/06/27 18:36:20 wiz Exp $ .\" .\" Copyright (c) 2000, 2002 The NetBSD Foundation, Inc. .\" All rights reserved. @@ -50,7 +50,8 @@ The .Nm driver provides access to several models of .Tn Mostek -time-of-day clock chips. Access methods to retrieve and set date and time +time-of-day clock chips. +Access methods to retrieve and set date and time are provided through the .Em TODR interface defined in @@ -75,7 +76,8 @@ typedef void (*mk48txx_nvwr_t)(bus_space_tag_t bus_tag, Specify bus space access to the chip's non-volatile memory .Pq including the clock registers . .It Fa model -The chip model which this instance should serve. Must be one of +The chip model which this instance should serve. +Must be one of .Dq mk48t02 , .Dq mk48t08 , .Dq mk48t18 @@ -84,13 +86,16 @@ or .It Fa year0 The actual year represented by the clock's .Sq year -counter. This is generally dependent on the system configuration in which -the clock device is mounted. For instance, on Sun Microsystems machines +counter. +This is generally dependent on the system configuration in which +the clock device is mounted. +For instance, on Sun Microsystems machines the convention is to have clock's two-digit year represent the year 1968. .It Fa nvread .It Fa nvwrite Specify alternate access methods for reading resp. writing clock -device registers. The default, when +device registers. +The default, when .Dv NULL is passed as an access method, is to access the chip memory .Pq and clock registers @@ -106,8 +111,8 @@ location to be read from or written to, respectively. .Pp Note that if the resulting date retrieved with the todr_gettime() method is earlier that January 1, 1970, the driver will assume that the chip's -year counter actually represents a year in the 21st century. This -behaviour can be overridden by setting the global variable +year counter actually represents a year in the 21st century. +This behaviour can be overridden by setting the global variable .Va mk48txx_auto_century_adjust to zero. .Sh HARDWARE