> wm0 at pci2 dev 6 function 0: Intel i82540EM 1000BASE-T Ethernet, rev. 2
> wm0: interrupting at irq 10
> wm0: 32-bit 33MHz PCI bus
> wm0: 64 word (6 address bits) MicroWire EEPROM
> wm0: Ethernet address 00:07:e9:29:37:d7
> makphy0 at wm0 phy 1: Marvell 88E1011 Gigabit PHY, rev. 3
> makphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT,
> 1000baseT-FDX, auto
>
> wm0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         capabilities=87<IP4CSUM,TCP4CSUM,UDP4CSUM,TSO4>
>         enabled=0
>         address: 00:07:e9:29:37:d7
>         media: Ethernet autoselect (1000baseT
> full-duplex,flowcontrol,master,rxpause,txpause)
>         status: active
>         inet 192.168.80.90 netmask 0xffffff00 broadcast 192.168.80.255
>         inet6 fe80::207:e9ff:fe29:37d7%wm0 prefixlen 64 scopeid 0x1
>
Your NIC is supported according to wm(4) docs but not sure about the rev.2.

     +   Intel i82540EM 1000BASE-T Ethernet
     +   Intel i82540EM (LOM) 1000BASE-T Ethernet