Click to expand.The driver for the Marvell Yukon ethernet chip doesn't come from Multibeast, it comes with OS X. Except I was mistaken about the 88E8056 version being supported OOB, it isn't. To support the 88E8056 version of the chip, you need to modify the driver, adding a new IOKitPersonality to support it. Open /System/Library/Extensions. Copy IONetworkingFamily.kext to the desktop (we'll work on this copy of it, not on the original kext in place). Right-click IONetworkingFamily.kext and choose 'Show Package Contents'.

Inside there, double-click Contents, then Plug-ins. Right-click AppleYukon2.kext and choose 'Show Package Contents'. Double-click Contents. Open Info.plist (that's IONetworkingFamily.kext/Contents/Plug-ins/AppleYukon2.kext/Contents/Info.plist if you've been following along). Find the section 'IOKitPersonalities'.

We're going to be adding a new 'personality'. Paste the code below into this section - anywhere is fine, just make sure you get the. Code: Yukon-88E8056 CFBundleIdentifier com.apple.iokit.AppleYukon2 EnableLowPwr 1 IOClass yukon2osx IOPCIPrimaryMatch 0x436411ab IOProviderClass IOPCIDevice MACNumber 1 Model Yukon Gigabit Adapter 88E8056 Singleport Copper SA NetworkNumber 1 RxDeadman 0 RxRingGrowOnPause 10 RxRingSize 0 RxRingSize100MBit 128 RxRingSize10MBit 64 RxRingSizeGigaBit 256 TxRingSize 256 Vendor Marvell Once this is done, save your copy IONetworkingFamily.kext (you have been working with a backup copy on the desktop, right?).

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Use KextBeast to install the modified kext back to /System/Library/Extensions, reboot, and you should be in business! Unfortunately this type of kext change can get blown away by a future OS update, so just remember how to do it and keep that code handy.