macosx: como recarregar o kext ethernet?

Question

Eu estava pensando em um kextunload seguido por um kextload , mas isso não funcionou de verdade:

%sudo kextunload /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/AppleYukon2.kext 
(kernel) Can't unload kext com.apple.iokit.AppleYukon2; classes have instances:
(kernel)     Kext com.apple.iokit.AppleYukon2 class sk98osx_dnet has 1 instance.
(kernel)     Kext com.apple.iokit.AppleYukon2 class yukon has 1 instance.
(kernel)     Kext com.apple.iokit.AppleYukon2 class yukon2osx has 1 instance.
Failed to unload com.apple.iokit.AppleYukon2 - (libkern/kext) kext is in use or retained (cannot unload).

%sudo kextload /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/AppleYukon2.kext

Depois disso, estou recebendo isso:

%ifconfig en0
ifconfig: interface en0 does not exist

Cada nova tentativa com kext(un)load não muda nada nessa situação.

Ao tentar isso, recebo essas mensagens em kernel.log :

Nov  1 02:05:17 76-128 kernel[0]: Can't unload kext com.apple.iokit.AppleYukon2; classes have instances:
Nov  1 02:05:17 76-128 kernel[0]: Kext com.apple.iokit.AppleYukon2 class sk98osx_dnet has 1 instance.
Nov  1 02:05:17 76-128 kernel[0]: Kext com.apple.iokit.AppleYukon2 class yukon has 1 instance.
Nov  1 02:05:17 76-128 kernel[0]: Kext com.apple.iokit.AppleYukon2 class yukon2osx has 1 instance.
Nov  1 02:06:32 76-128 kernel[0]: AppleYukon2: 00000000,00000000 sk98osx_dnet - AllocIOInterruptHandler - Failed to allocate MSI interrupt
Nov  1 02:06:32 76-128 kernel[0]: AppleYukon2: RxRingSize <= 1024, TxRingSize 256, RX_MAX_LE 1024, TX_MAX_LE 768, ST_MAX_LE 3328