This is usually caused by an interrupt conflict (e.g., two boards using the same IRQ). FreeBSD prior to 2.0.5R used to be tolerant of this, and the network driver would still function in the presence of IRQ conflicts. However, with 2.0.5R and later, IRQ conflicts are no longer tolerated. Boot with the -c option and change the ed0/de0/... entry to match your board.
If you are using the BNC connector on your network card, you may also see device timeouts because of bad termination. To check this, attach a terminator directly to the NIC (with no cable) and see if the error messages go away.
Some NE2000 compatible cards will give this error if there is no link on the UTP port or if the cable is disconnected.
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