On Fri, 1 Aug 2008, Martin wrote:
I don't remember anymore when I reported it the first time. I think it was
around 4.x or something like that. The em(4) bug is still there after years.
Hasn't anyone really noticed yet that em(4) only appears when you boot
FreeBSD with the interface physically attached to a switch for example? If
you attach it later, after boot up, the interface won't power up and appear
in the interface list (ifconfig)?
The card range supported by the if_em driver is huge, so it wouldn't be
surprising if this is a hardware bug affecting a relatively narrow line of
parts. I've added Jack Vogel to the CC line, as he's the Intel developer
responsible for maintaining our if_em driver. I don't promise he can help
either, but it's worth a try :-).
Robert
Steps to reproduce:
1) Switch your PC/laptop off. Really OFF, no reboot.
2) Disconnect the em(4) NIC from your switch.
3) Boot FreeBSD.
4) Plug in the ethernet cable.
5) Tataa! All leds at the NIC stay off. You won't be able to use em(4)
unless you reboot your machine.
Something is not being initialized properly on em(4) devices, it seems.
I have had 3 of 3 em(4) NICs so far, where this bug shows up. And it's
extremely annoying on Thinkpads, when you just want to plug in your
laptop somewhere.
--
Martin
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