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wiz 2003-06-27 18:36:20 +00:00
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21
share/man/man4/mk48txx.4
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@ -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