From 732ac3a52a25be71d6dd963b6ec53455b0acb906 Mon Sep 17 00:00:00 2001 From: Karel Zak Date: Mon, 20 Oct 2014 14:01:25 +0200 Subject: hwclock: add notes about default behavior changes Signed-off-by: Karel Zak --- sys-utils/hwclock.8.in | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'sys-utils/hwclock.8.in') diff --git a/sys-utils/hwclock.8.in b/sys-utils/hwclock.8.in index 5df95e761..3c021bfe0 100644 --- a/sys-utils/hwclock.8.in +++ b/sys-utils/hwclock.8.in @@ -19,6 +19,19 @@ periodically to add or subtract time from the Hardware Clock to compensate for systematic drift (where the clock consistently loses or gains time at a certain rate when left to run). +Since v2.26 +.B hwclock +does not update Hardware Clock's drift factor in @ADJTIME_PATH@ by default. +It's necessary to use \fB\-\-update-drift\fR with \fB\-\-set\fR or +\fB\-\-systohc\fR to force drift factor update. + +Since v2.26 +.B hwclock +automatically compensates Hardware Clock to account for systematic drift before +using it to set the System Clock by \fB\-\-hctosys\fR. It means that +\fB\-\-adjust\fR is no more necessary during boot. This functionality makes +hwclock usable early in boot process when the root filesystem is read-only. + .SH FUNCTIONS You need exactly one of the following options to tell .B hwclock -- cgit v1.2.3-55-g7522