I have one that works fine: mskc0 at pci1 dev 0 function 0 "Marvell Yukon 88E8053" rev 0x22, Yukon-2 EC rev. A3 (0x2): apic 1 int 16
But there are several variants of this chip, and some are buggier than others. Problems have been reported before. Unfortunately I have never been able to reproduce them.
