Looks like the Pi 4 and bcmgenet driver do not have HW timestamp, although I'm just kinda guessing what to look for in the driver source:I'd guess CM4 is probably the same, I think it's the same BCM2711 SoC and bcmgenet Ethernet as the Pi4.
Code:
murph@raspberrypi:~ $ grep ^Model /proc/cpuinfoModel : Raspberry Pi 4 Model B Rev 1.5murph@raspberrypi:~ $ sudo ethtool -T end0Time stamping parameters for end0:Capabilities: software-transmit software-receive software-system-clockPTP Hardware Clock: noneHardware Transmit Timestamp Modes: noneHardware Receive Filter Modes: nonemurph@raspberrypi:~ $ egrep -ir 'ptp|timestamp' src/debian/linux-6.6.51/drivers/net/ethernet/broadcom/genetsrc/debian/linux-6.6.51/drivers/net/ethernet/broadcom/genet/bcmgenet.c: skb_tx_timestamp(skb);murph@raspberrypi:~ $Statistics: Posted by Murph9000 — Wed Oct 02, 2024 2:21 am