The service included in the ptp4l package is located at the following path:
/usr/lib/systemd/system/ptp4l.service
Example
$OPTIONS is located at the following path:
/etc/sysconfig/ptp4l
Change ptp4l to the following:
OPTIONS=-m -f /etc/ptp4l.conf
To change the ptp4l configuration file, override the following file:
/etc/ptp4l.conf
Service output will be located at the following path:
/var/log/messages
service ptp4l start
service ptp4l stop
service ptp4l status