diff options
Diffstat (limited to 'hwclock/hwclock.8')
| -rw-r--r-- | hwclock/hwclock.8 | 52 |
1 files changed, 22 insertions, 30 deletions
diff --git a/hwclock/hwclock.8 b/hwclock/hwclock.8 index 7e4106d45..07c4f8cdb 100644 --- a/hwclock/hwclock.8 +++ b/hwclock/hwclock.8 @@ -53,7 +53,7 @@ what function to perform: .TP .B \-\-show Read the Hardware Clock and print the time on Standard Output. -The time is always in local time, even if you keep your Hardware Clock +The time shown is always in local time, even if you keep your Hardware Clock in Coordinated Universal Time. See the .B \-\-utc option. @@ -130,9 +130,12 @@ option. .B \-\-epoch=year Specifies the year which is the beginning of the Hardware Clock's epoch. I.e. the number of years into AD to which a zero value in the -Hardware Clock's year counter refers. +Hardware Clock's year counter refers. It is used together with +the \-\-setepoch option to set the kernel's idea of the epoch of the +Hardware Clock, or otherwise to specify the epoch for use with +direct ISA access. -For example, +For example, on a Digital Unix machine: .sp .I hwclock --setepoch --epoch=1952 @@ -226,48 +229,37 @@ whenever it finds your Hardware Clock set to 1994 or 1995. .TP .B \-\-srm +This option is equivalent to +.B \-\-epoch=1900 +and is used to specify the most common epoch on Alphas +with SRM console. .TP .B \-\-arc +This option is equivalent to +.B \-\-epoch=1980 +and is used to specify the most common epoch on Alphas +with ARC console (but Ruffians have epoch 1900). .TP .B \-\-jensen .TP .B \-\-funky\-toy -These options all tell -.B hwclock -what kind of Alpha machine you have. They -are invalid if you don't have an Alpha and shouldn't be necessary if you -do, because +These two options specify what kind of Alpha machine you have. They +are invalid if you don't have an Alpha and are usually unnecessary +if you do, because .B hwclock should be able to determine by itself what it's running on, at least when .I /proc -is mounted. These options make it possible for -.B hwclock -to work even when -its environment does not conform to its expectations and thus it cannot -accurately determine what sort of system it is running on. If you think -hwclock is incorrectly determining the system's characteristics, try -running with the -.B \-\-debug -option to see what conclusions the program is -reaching and how. If you find you need one of these options to make -.B hwclock -work, contact the +is mounted. +(If you find you need one of these options to make .B hwclock -maintainer to see if the program can be improved to detect your system -automatically. +work, contact the maintainer to see if the program can be improved +to detect your system automatically. Output of `hwclock --debug' +and `cat /proc/cpuinfo' may be of interest.) .B \-\-jensen means you are running on a Jensen model. -.B \-\-arc -means your machine uses epoch 1980 in its hardware clock, as is commonly -the case for machines on ARC console (but Ruffians have epoch 1900). - -.B \-\-srm -means your machine uses epoch 1900 in its hardware clock, as is commonly -the case for machines on SRM console. - .B \-\-funky\-toy means that on your machine, one has to use the UF bit instead of the UIP bit in the Hardware Clock to detect a time transition. "Toy" |