Software PTP TX Linux kernel driver patch for Marvell ethernet

How

• Copy patch in Linux kernel source directory

• cd into source directory

• Apply the patch

   patch -p1 < sky2.patch

• Rebuild kernel as usual

Why

To be able to test PTP software & slave-only mode on some old HW which uses Marvell Yukon Gigabit Ethernet Controller.

Before

ethtool -T ens5
Time stamping parameters for ens5:
Capabilities:
    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

After

ethtool -T ens5
Time stamping parameters for ens5:
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

And ptp4l at least launches