I have a similar problem with a "IBM PRO/1000 PT Dual Port Server Adapter Low Profile - 39Y6128" (in a HP MicroServer) that was at least recognized with 6, but on 7, I get:
wm0 at pci2 dev 0 function 0: Intel PRO/1000 PT (82571EB) (rev. 0x06) wm0: interrupting at ioapic0 pin 18 wm0: PCI-Express bus wm0: could not acquire SWSM SMBI wm0: wm_nvm_acquire: failed to get semaphore wm0: could not acquire SWSM SMBI wm0: wm_nvm_acquire: failed to get semaphore wm0: No EEPROM wm0: unable to read Ethernet address wm1 at pci2 dev 0 function 1: Intel PRO/1000 PT (82571EB) (rev. 0x06) wm1: interrupting at ioapic0 pin 19 wm1: PCI-Express bus wm1: could not acquire SWSM SMBI wm1: wm_nvm_acquire: failed to get semaphore wm1: could not acquire SWSM SMBI wm1: wm_nvm_acquire: failed to get semaphore wm1: No EEPROM wm1: unable to read Ethernet address
