iMAC with Broadcom 14e4-1686 BCM57766 : link status down

[SebastianRoth]

(2017-06-13 15:24)NiKiZe Wrote:  What is needed is to find out which register in the NIC is affected, so 2 machines with the same nic (one working firmware and one with issues) and then dumping the nics registers might give information about what needs to be done. and maybe comparing this to some other driver (linux?) but even better if we could get datasheets.

Bumping this topic as I hope we can get this fixed. Unfortunately I don't know much about about NIC registers yet but I am willing to dive in and learn if you could give me some advice on where to start reading. Code, books, URLs or just keywords that I can look up would be great. In case you already have some code that we could run on two different Macs to dump the NIC registers that would be awesome.

(2017-06-23 12:04)speleo14 Wrote:  I may be able to open a case with Apple engineering, but this will still need some time.

Did you get in contact with Apple yet. Maybe they have a general idea on what has changed that could break PXE booting (link state up).

Just found this by accident. Might be related.

Thanks in advance!