failed to create a clock

Would you please elaborate on this:

If in the log the message failed to create a clock appears, it likely means the required kernel configuration bits were not enabled.

I have been having a hard time getting the RPi 3 to run PTP and get the PPS output. I used the Raspbian Stretch Lite (2018-10-09) and for the Kernel I used the rpi-4.14.y. I did the following

sudo apt update sudo apt install ethtool linuxptp sudo apt install git bc bison flex libssl-dev

git clone https://github.com/raspberrypi/linux git checkout rpi-4.14.y git fetch

sed -i -e 's/time_stamping.*$/time_stamping\t\tsoftware/' /etc/linuxptp/ptp4l.conf

then

sudo apt install git bc libncurses5-dev cd linux KERNEL=kernel7 make bcm2709_defconfig make -j4 zImage modules dtbs

After waiting I did the following

echo 'CONFIG_NETWORK_PHY_TIMESTAMPING=y' >> .config echo 'CONFIG_PTP_1588_CLOCK=y' >> .config echo 'CONFIG_PPS_GENERATOR_GPIO=y' >> .config

Then I applied the patches with some minor changes to make it work for this verion patch /patches/0001-pps-add-gpio-PPS-signal-generator.patch patch /patches/0002-add-DT-overlay-for-pps-gen-gpio-generator.patch

followed by:

make bcm2709_defconfig make olddefconfig make -j4 zImage modules dtbs

and finally:

sudo make modules_install sudo cp arch/arm/boot/dts/.dtb /boot/ sudo cp arch/arm/boot/dts/overlays/.dtb* /boot/overlays/ sudo cp arch/arm/boot/dts/overlays/README /boot/overlays/ sudo cp arch/arm/boot/zImage /boot/$KERNEL.img

Then after reboot I have the following:

pi@raspberrypi:~ $ ethtool -T eth0 Time stamping parameters for eth0: Capabilities: software-transmit (SOF_TIMESTAMPING_TX_SOFTWARE) software-receive (SOF_TIMESTAMPING_RX_SOFTWARE) software-system-clock (SOF_TIMESTAMPING_SOFTWARE) PTP Hardware Clock: none Hardware Transmit Timestamp Modes: none Hardware Receive Filter Modes: none

but I still have

failed to create a clock in the syslog and I cannot see any PPS output on pin 18.

Would you please recommend me any change or modifications.

Thank you in advance

twteamware / raspberrypi-ptp

failed to create a clock #7