TLDR: Two boards, one won’t boot from PoE, definitely the mainboard (or software) that is the problem, can anyone help me debug?
Hi, I have two identical setups:
NVMe (Acer 128GB from Allnet)
RockPi PoE hat
Both booting from NVMe, from the same build (Debian 9) using the same guides. Both are connected to the same switch (Unifi 8 port 60w), using the same two sockets (have swapped both to eliminate anything to do with the switch). Switch shows <4w for the running board, and there are no other PoE devices connected.
One board will not boot from PoE alone, requiring USB power instead, I just get a green flashing light when using the PoE alone (according to @jack previously, this indicates that not enough power is reaching the board, or that the supply is irregular).
I have swapped the PoE hats, and the same situation holds - the same RPI does not boot, so I know that the hats are fine.
Can anyone help me with the next steps in debugging? I am running fairly simple packages at the moment, but I’m now going through comparing these to each other in the hope that I find something that looks different.