I ask here although there is a good thread because I don't want a facebooq or googre account.
I'd like to understand how I could wake a Pi after shutdown/halt/power-off. Querying the embedded BCM54213PE NIC with ethtool reports d which means disabled which means supported.
When enabling from latest Raspbian, I get the following error:
sudo ethtool -s eth0 wol g
Cannot set new wake-on-lan settings: Unknown error 524 not setting wol
pi@pi:~ $ echo $?
0I can add the chip is still powered as the activity LED still blinks so the link is maintained and enough supply remains to trigger a reboot by sending a pulse to GLOBAL_EN or equiv GPIO.
The solution in the link above is bad as not real Wake-on-LAN, requires additional 12V supply and is nearly as expensive as the Pi itself. Only good thing, it really cuts the mains to the 5V wallet.
I wonder if there is a way to enable Wake-on-LAN for the embedded NIC. If really not because of Pi's genetics (hardware design) then a dedicated slave NIC as wiz5500+PIC is the solution. I reached to do it with an old 82558B PCI NIC and some discrete components, unfortunately it draws too much power (1,5W).
31 Answer
Wake-on-LAN support is implemented on the motherboard and network interface. WoL is an hardware feature that is not implemented on the Raspberry PI boards.
Same thing with USB: no wake up supported
Out-Of-The-Box Pi4 cannot be started by WOL
But you can add some third party hardware for power management that implement WoL.
